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Lee County Natural Disasters and Weather Extremes

 
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The chance of earthquake damage in Lee County is about the same as Iowa average and is much lower than the national average. The risk of tornado damage in Lee County is lower than Iowa average and is higher than the national average.

Topics:Earthquake IndexVolcano IndexTornado IndexOther Weather Extremes EventsVolcanos NearbyHistorical Earthquake EventsHistorical Tornado Events

Earthquake Index, #20

Lee County
0.00
Iowa
0.00
U.S.
1.81

The earthquake index value is calculated based on historical earthquake events data using USA.com algorithms. It is an indicator of the earthquake level in a region. A higher earthquake index value means a higher chance of an earthquake.

Volcano Index, #1

Lee County
0.0000
Iowa
0.0000
U.S.
0.0023

The volcano index value is calculated based on the currently known volcanoes using USA.com algorithms. It is an indicator of the possibility of a region being affected by a possible volcano eruption. A higher volcano index value means a higher chance of being affected.

Tornado Index, #87

Lee County
179.50
Iowa
236.74
U.S.
136.45

The tornado index value is calculated based on historical tornado events data using USA.com algorithms. It is an indicator of the tornado level in a region. A higher tornado index value means a higher chance of tornado events.

Other Weather Extremes Events

A total of 12,923 other weather extremes events within 50 miles of Lee County were recorded from 1950 to 2010. The following is a break down of these events:

TypeCountTypeCountTypeCountTypeCountTypeCount
Avalanche:0Blizzard:38Cold:135Dense Fog:98Drought:60
Dust Storm:0Flood:1,672Hail:3,664Heat:119Heavy Snow:132
High Surf:0Hurricane:0Ice Storm:80Landslide:1Strong Wind:152
Thunderstorm Winds:5,574Tropical Storm:0Wildfire:0Winter Storm:222Winter Weather:228
Other:748 

Volcanos Nearby

No volcano is found in or near Lee County.

Historical Earthquake Events

No historical earthquake events that had recorded magnitudes of 3.5 or above found in or near Lee County.

No historical earthquake events found in or near Lee County.

Historical Tornado Events

A total of 75 historical tornado events that had recorded magnitude of 2 or above found in or near Lee County.

Distance (miles)DateMagnitudeStart Lat/LogEnd Lat/LogLengthWidthFatalitiesInjuriesProperty DamageCrop DamageAffected County
4.62003-05-10240°32'N / 91°35'W40°38'N / 91°25'W11.50 Miles200 Yards001.0M0Lee
 Brief Description: Tornado developed 1.5 miles west of Argyle at 1728 CST and moved northeast for 11.5 miles before dissipating 1.3 miles North of Viele at 1747 CST. A maximum rating of F2 was noted just west of Argyle where a house was turned approximately 120 degrees and moved 25 to 40 feet off its foundation. Three teens ran inside the house and sought shelter, 2 in an interior bathroom and the other under the stairs. Three large trees on the back edge of the property stopped the house and likely prevented the teens from being injured or killed. The remainder of the damage path saw F0 and F1 damage.
6.01954-04-30240°40'N / 91°30'W40°48'N / 91°25'W9.90 Miles200 Yards01250K0Lee
9.71960-03-29240°40'N / 91°20'W40°46'N / 91°18'W6.60 Miles200 Yards003K0Lee
9.71967-04-30240°38'N / 91°19'W40°40'N / 91°16'W2.30 Miles400 Yards00250K0Lee
10.91967-01-24340°40'N / 91°19'W40°42'N / 91°14'W4.30 Miles300 Yards16250K0Lee
11.41977-05-04240°47'N / 91°36'W2.00 Miles60 Yards00250K0Lee
14.61967-01-24240°42'N / 91°14'W40°45'N / 91°12'W3.00 Miles200 Yards04250K0Lee
14.71964-04-26240°36'N / 91°45'W2.00 Miles200 Yards0025K0Van Buren
17.11964-08-20240°41'N / 91°48'W0.30 Mile50 Yards00250K0Van Buren
17.71965-08-25340°52'N / 91°18'W3.00 Miles100 Yards01250K0Des Moines
17.71977-05-04240°52'N / 91°18'W2.00 Miles10 Yards0025K0Des Moines
18.81999-04-08340°21'N / 91°27'W40°25'N / 91°20'W7.50 Miles200 Yards0015.0M0Hancock
 Brief Description: A tornado developed just west of Warsaw in Hancock County and produced F2 damage to homes in the south part of the community. 2 homes were destroyed while another 30 structures suffered damage, including the high school track and football field and fairgrounds. Trees and branches were blown down in many parts of town. The tornado moved northeast into Hamilton where F3 damage occurred. The tornado destroyed or damaged 144 homes and businesses amounting to 10 million dollars in total damage. 4 people suffered minor injuries. The KHQA-TV tower and KOKX radio tower were destroyed. Governor George Ryan declared Hancock County a state disaster area. The tornado weakened and lifted just northeast of Hamilton. Strong thunderstorms continued over much of Hamilton County in the wake of the tornado producing torrential rain and water over various roads in town.
18.91973-05-01340°25'N / 91°44'W40°27'N / 91°40'W3.60 Miles440 Yards2202.5M0Clark
22.51959-05-09340°52'N / 91°47'W40°54'N / 91°46'W01250K0Van Buren
22.61974-04-13340°16'N / 91°29'W40°23'N / 91°20'W11.00 Miles700 Yards002.5M0Hancock
23.41977-05-04240°58'N / 91°33'W41°00'N / 91°31'W01250K0Henry
24.01974-04-13240°17'N / 91°30'W40°19'N / 91°25'W4.30 Miles100 Yards0025K0Clark
24.11954-04-30240°17'N / 91°44'W40°24'N / 91°40'W8.30 Miles100 Yards0025K0Boone
24.21967-04-21240°53'N / 91°56'W41°04'N / 91°21'W32.80 Miles100 Yards00250K0Van Buren
25.71995-05-13240°28'N / 92°01'W40°30'N / 91°49'W8.00 Miles200 Yards03630K0Clark
 Brief Description: A tornado touched down near Arbela damaging at least half a dozen moble homes at a camp ground. As it moved east, just north of Highway 136, several homes, businesses, barns, and outbuildings were destroyed. Two people were slightly injured when the windows in their car shattered as the vehicle was tossed around by the tornado. A woman was injured in the Granger area when the roof of her home was torn off and a 2x6 support beam fell in. The tornado crossed the county line around 1430 CST and leveled a home and nearby farm before dissipating over an open field northeast of Luray.
27.32006-04-02240°45'N / 92°00'W40°47'N / 91°57'W3.00 Miles100 Yards0030K0Van Buren
 Brief Description: Rated F2. Tornado touched down about 0.5 miles west of Pittsburg near a cemetery and continued northeast for 3 miles just along the west edge of the Des Moines River. Along this path, 2 homes were unroofed and 4 outbuildings were destroyed. Many trees were snapped or uprooted and power poles were blown down.
27.71967-04-16340°42'N / 92°06'W40°54'N / 91°50'W19.40 Miles500 Yards2162.5M0Van Buren
28.91959-05-09340°54'N / 91°46'W41°09'N / 91°40'W17.80 Miles250 Yards00250K0Jefferson
28.92003-05-10240°12'N / 91°20'W40°27'N / 90°55'W28.40 Miles200 Yards00400K0Hancock
 Brief Description: Tornado developed in Adams County (WFO LSX) and moved northeast, entering Hancock county 1.2 miles southeast of Tioga at 1749 CST. The tornado moved in a northeast direction for 10.7 miles, passing 2.5 miles south of Basco where F2 damage was noted, and then turned slightly right. The tornado continued northeast for 17.7 miles, passing 1.2 miles south of Bentley and exited into McDonough County 3.9 miles SE of Fountain Green at 1830 CST. Most damage along the path in Hancock County was F0 and F1. The tornado was on the ground for a total of 28.4 miles in Hancock County.
29.31966-05-23240°58'N / 91°11'W41°01'N / 91°07'W4.10 Miles100 Yards00250K0Des Moines
29.51973-04-20340°26'N / 92°03'W40°33'N / 91°57'W9.50 Miles440 Yards00250K0Scotland
29.71974-05-13241°00'N / 91°09'W1.00 Mile50 Yards00250K0Des Moines
31.02008-04-10240°43'N / 92°03'W40°45'N / 92°04'W2.00 Miles220 Yards00150K0KVan Buren
 Brief Description: EVENT NARRATIVE: An EF2 tornado moved northeast from just southeast of Lebanon to just northeast of Lebanon during the early evening of April 10th. A wine shed and mobile home were destroyed. The top was ripped off of a silo and the second story of a winery was damaged. A house sustained minor structural damage and several large trees were topped off. EPISODE NARRATIVE: Heavy rain-producing thunderstorms moved across Northeast Missouri, Eastern Iowa, and west central & northwest Illinois during the late afternoon and evening hours of April 10th. Some of the storms produced tornadoes ranging in intensity from EF0 to EF2.
32.72003-05-10240°08'N / 91°30'W40°13'N / 91°21'W10.00 Miles300 Yards0400Adams
 Brief Description: The tornado that hit Canton, Missouri crossed the Mississippi River Lock and Dam 20 just southwest of Meyer. The tornado was weak, F0 in intensity, as it moved east northeast across the Illinois flood plain causing only sporadic tree damage. The tornado began to strengthen as it moved off the flood plain and severely damaged a home and garage along County Road 603 about 1 mile southwest of Lima. The tornado reached its maximum strength just southwest of Lima where it caused major damage. The tornado cut a 200-300 yard wide path of damage across the north side of Lima. About 40-50 structures were damaged by the tornado. Several barns and similar type buildings were destroyed as were 2 mobile homes. One frame house lost its entire roof with several others suffering major roof damage. There were only 4 injuries as everyone took shelter in basements or interior rooms.
34.11967-04-21341°00'N / 91°56'W000K0Jefferson
34.71967-01-24240°51'N / 90°56'W40°55'N / 90°51'W5.70 Miles77 Yards0025K0Henderson
35.11967-01-24340°52'N / 92°05'W25.00 Miles400 Yards00250K0Van Buren
36.11975-11-09240°54'N / 92°06'W41°00'N / 91°59'W8.80 Miles33 Yards03250K0Jefferson
37.11975-11-09240°53'N / 92°07'W40°54'N / 92°06'W00250K0Van Buren
37.11957-05-21240°07'N / 91°43'W40°09'N / 91°39'W3.60 Miles400 Yards02250K0Lewis
37.71999-04-08240°06'N / 91°55'W40°14'N / 91°43'W16.00 Miles150 Yards022.1M0Lewis
 Brief Description: A tornado tore a 16 mile path of destruction across Lewis County causing an estimated $2.1 million in damage. The tornado first formed near LaBelle, where it destroyed a modular home and seriously damaged another home. Several barns were destroyed as were numerous sheds and other farm outbuildings. Several homes in town also sustained roof and siding damage. A pickup truck was picked up and moved about 100 yards. The woman occupant suffered minor injuries. The tornado moved northeast and reached its maximum strength in the Midway area, near the intersection of Highway H and Y. In this area 2 homes were considered destroyed as were 3 barns and numerous sheds and outbuildings. The tornado caused more damage as it moved northeast between Monticello and Williamstown. A couple of barns were destroyed as were several outbuildings. Two homes suffered roof damage. There was 1 injury in this area. A man suffered a cut on his head when hit by flying debris.
37.91982-09-13240°59'N / 92°11'W41°01'N / 91°53'W13.00 Miles100 Yards002.5M0Jefferson
37.91988-05-08240°55'N / 92°09'W41°10'N / 91°49'W27.00 Miles60 Yards0025.0M0Jefferson
38.81974-04-13240°14'N / 90°57'W40°18'N / 90°55'W4.30 Miles500 Yards0102.5M0Hancock
39.51967-01-24241°12'N / 91°17'W2.00 Miles150 Yards0125K0Louisa
39.61989-04-27240°48'N / 92°16'W40°44'N / 92°10'W6.00 Miles60 Yards00250K0Davis
39.91988-05-08240°54'N / 92°10'W40°55'N / 92°09'W3.00 Miles60 Yards0025.0M0Wapello
40.11970-05-13240°11'N / 92°03'W40°16'N / 91°57'W7.60 Miles50 Yards0025K0Knox
40.41973-09-30340°14'N / 90°56'W000K0Hancock
40.41957-05-21240°05'N / 91°47'W40°07'N / 91°43'W3.80 Miles400 Yards00250K0Lewis
40.51974-04-13240°18'N / 90°55'W40°26'N / 90°41'W15.20 Miles500 Yards00250K0Mcdonough
40.51967-01-24440°35'N / 92°16'W40°41'N / 92°14'W6.80 Miles150 Yards0025K0Davis
40.61970-05-09241°13'N / 91°17'W1.00 Mile100 Yards0025K0Louisa
41.01999-04-05240°32'N / 90°43'W40°37'N / 90°41'W6.40 Miles100 Yards006K0Mcdonough
 Brief Description: The tornado first touched down along Highway 9 southwest of Good Hope snapping several trees. From there the tornado moved northeast across Town Fork Creek damaging several trees in a densely wooded area and snapping two large trees along a county road. Damage along this path was rated F0. As the tornado continued northeast it moved through plowed farmland and approached a homestead along north-south county road west of Good Hope. The house sustained no structural damage, but several outbuildings suffered substantial damage. An older concrete block hog house was destroyed while the roof and sides of a new machine shed were torn off. A grain bin was blown about 500 yards from the home site into a neighboring field. Damage along this path was rated F2. For the next several miles the tornado tracked through plowed farmland snapping a few trees and blowing over several fences. The tornado then approached US Highway 67 just south of the McDonough-Warren County line. The tornado snapped two very large oak trees at a homestead with one landing on the house. It continued on a northeast track snapping several trees and damaging a roof on a homestead just south of the county line. Damage along this path was rated F1. The tornado then crossed from McDonough county into Warren county just east of highway 67. As the tornado continued northeast it hit a group of farm buildings north of the county line. Three of the buildings sustained major damage. A corn crib was blown on it's side while the roof of a barn and shed were destroyed. Damage along this path was rated F1. The tornado tracked into the south side of Swan Creek destroying a grain elevator. Just northeast of the elevator the walls of a concrete block machine shop were blown in and the building was completely destroyed. As is continued northeast it toppled several trees and antennae. Other damage in Swan Creek included two porches torn off homesteads and two roofs lifted, but not pulled off homesteads. Damage along this path was rated F2. The tornado continued northeast and lifted just north of town.
41.61957-05-21340°30'N / 90°48'W40°37'N / 90°35'W13.70 Miles120 Yards00250K0Mcdonough
42.11958-06-08240°55'N / 92°12'W003K0Wapello
42.21975-11-09241°15'N / 91°37'W0025K0Washington
42.31988-05-08241°10'N / 91°49'W41°20'N / 91°26'W19.00 Miles60 Yards0025.0M0Washington
42.41990-03-08240°12'N / 90°57'W40°12'N / 90°54'W2.00 Miles33 Yards00250K0Hancock
42.51999-04-05240°38'N / 90°41'W40°41'N / 90°39'W3.00 Miles100 Yards003K0Warren
 Brief Description: The tornado first touched down along Highway 9 southwest of Good Hope snapping several trees. From there the tornado moved northeast across Town Fork Creek damaging several trees in a densely wooded area and snapping two large trees along a county road. Damage along this path was rated F0. As the tornado continued northeast it moved through plowed farmland and approached a homestead along north-south county road west of Good Hope. The house sustained no structural damage, but several outbuildings suffered substantial damage. An older concrete block hog house was destroyed while the roof and sides of a new machine shed were torn off. A grain bin was blown about 500 yards from the home site into a neighboring field. Damage along this path was rated F2. For the next several miles the tornado tracked through plowed farmland snapping a few trees and blowing over several fences. The tornado then approached US Highway 67 just south of the McDonough-Warren County line. The tornado snapped two very large oak trees at a homestead with one landing on the house. It continued on a northeast track snapping several trees and damaging a roof on a homestead just south of the county line. Damage along this path was rated F1. The tornado then crossed from McDonough county into Warren county just east of highway 67. As the tornado continued northeast it hit a group of farm buildings north of the county line. Three of the buildings sustained major damage. A corn crib was blown on it's side while the roof of a barn and shed were destroyed. Damage along this path was rated F1. The tornado tracked into the south side of Swan Creek destroying a grain elevator. Just northeast of the elevator the walls of a concrete block machine shop were blown in and the building was completely destroyed. As is continued northeast it toppled several trees and antennae. Other damage in Swan Creek included two porches torn off homesteads and two roofs lifted, but not pulled off homesteads. Damage along this path was rated F2. The tornado continued northeast and lifted just north of town.
42.72003-05-10240°13'N / 92°12'W40°18'N / 92°01'W7.00 Miles200 Yards0000Knox
 Brief Description: A damage survey completed by National Weather Service personnel of Knox County Missouri revealed a 7 mile long tornado path just north of Edina northeast to the Knox Scotland County line. The tornado first started about 4 miles north of Edina along Highway EE. Three power poles were snapped off and a couple of trees damaged. The tornado strengthened as it moved northeast causing damage along County Road 44, Highway K, and County Road 48. Numerous trees were mangled, farm outbuildings destroyed and power lines downed. A home along County Road 48 suffered major damage losing its roof and one wall. The damage at this point was rated F2, the strongest along the tornado path. The width of the damage at this point was about 200 yards wide. The damage path continued northeast downing trees and power lines. It crossed Highway V just west of County Road 76. Along Highway V, 2 grains bins were destroyed , an old abandoned house was destroyed, and a home lost its garage and part of the roof. The tornado continued northeast and crossed into Scotland County near the North Fabius River.
43.02003-05-10239°56'N / 91°50'W40°09'N / 91°30'W20.00 Miles200 Yards065.0M0Lewis
 Brief Description: A tornado formed just north of the Marion Lewis County line and continued northeast for 20 miles, eventually causing major damage in the city of Canton. The tornado first formed southeast of Steffenville where it damaged a barn and other outbuildings. Six homes suffered varying degrees of roof damage as the tornado crossed Highway N south of Ewing. The tornado crossed Highway 6 southeast of Ewing and damaged an electric substation. From Highway CC north to Highway P, about 20 homes and farm buildings suffered varying degrees of roof, siding and window damage. Numerous large trees were either uprooted or snapped off near the ground as well. The tornado crossed Highway 61 just southeast of Canton where it blew two tractor trailers off the road. Two men suffered minor injuries. The tornado then entered Canton about 630 pm. Information from Emergency Management personnel and city officials in Canton revealed 75-100 structures damaged with at least 40 receiving major damage. At Culver-Stockton College on the southeast side of town, the field house was flattened and another two story building lost its roof. Several very large trees on the campus were uprooted or snapped off near the ground. Four mobile homes on the north side of town were destroyed with four others suffering major damage. There were only 4 minor injuries reported in Canton.
43.51974-05-30240°04'N / 91°22'W40°02'N / 91°04'W15.80 Miles200 Yards0122.5M0Adams
45.11970-05-09241°18'N / 91°32'W2.00 Miles100 Yards0025K0Washington
45.81955-05-26240°02'N / 91°09'W1.50 Miles500 Yards0025K0Adams
45.81999-04-08240°53'N / 92°22'W40°56'N / 92°12'W5.00 Miles200 Yards00100K0Wapello
 Brief Description: As mentioned in the narrative above, an intense low pressure formed to the southwest of Iowa. The low tracked northeast and lifted into eastern Nebraska. Ahead of the low, a strong low level jet of around 60 knots continued through the day. A nearly stationary frontal boundary extended east from the low. It lifted into southeast Nebraska during the day, but made little progress into southern Iowa. Lines of thunderstorms formed along the boundary through the day and lifted north rapidly. These storms were elevated in nature and as a result produced most of their severe weather in the form of hail. As the day unfolded, a sharp dry line was clearly evident on the satellite as early as 1600 UTC across Kansas. This line raced east during the day. By afternoon, a speed max had rotated around the upper low to the southwest with wind speeds measured by the Lathrop wind profiler at 100 knots at 500 mb by mid afternoon. Jet stream winds were in excess of 120 knots at the same time. Combined with the dynamic situation mentioned above, considerable moisture convergence took place near the triple point between the warm front and the dry line. Surface dew points pooled into to the mid 60s to even a few 70 degree F. dew point readings over northwest Missouri, southeast Nebraska, and southwest Iowa. Meanwhile, dew points fell into the upper 20s over northeast Kansas and south central Nebraska behind the dry line, with teens over central and south central Kansas. Thunderstorms erupted along the dry line by mid day and advanced east through the afternoon. Low level helicity values topped out between 500 and 600 (m/s)**2 just before the first tornadoes formed. Most of the storms in the warm sector became tornadic quickly. The northern limit of the tornado tracks extended about 10 miles or so north of the warm front. Tracks became intermittent very quickly as soon as the storms crossed the surface warm front due to the layer of very cold air just north of the front. Surface temperatures on the cold side of the front were only in the upper 40s to mid 50s. The entire day was very active. Initially, warm air advection thunderstorms produced hail at many locations of central and northern Iowa. Most of is was just below severe levels however. The activity that developed during the afternoon was a combination of warm air advection and the approach of the dryline. At the beginning of the event, the main weather feature was in the form of hail. There were numerous reports of hail three quarters to one and three quarters inch in diameter. The largest hail fell in Guthrie and Dallas Counties with reports of golf ball size hail. One of the storms in the initial wave of afternoon activity became stronger as it moved into southern Story County. Initially, high winds of 60 MPH or more swept through Sheldahl area of Boone County. Greene County was also affected by high winds from the storms. A tornado dropped out of the storm as it moved into the Slater area and was on the ground for about 2 miles. Initial estimates showed 44 homes and businesses damaged in Story County, one was destroyed with major damage to another. Thirty six homes and four businesses were damaged in the town of Slater. Two people were injured during the passage of the tornado. One of the injuries involved a 70 year old man who was picked up by the tornadoes winds and thrown about 10 feet before he latched on to something. His shoulder was dislocated and he required 6 stitches due to his injuries in his hand. High winds northeast of Slater knocked several cars of a Burlington Northern freight train off the tracks after they were blown more than one quarter mile down the track. It was not possible to determine of the cars were knocked off by the tornado or high winds however. This band of storms continue to race and develop northeast through the afternoon. Damage became more sporadic, however high winds occurred as far northeast as Hardin County, with 70 MPH winds reported near New Providence. Hail reports came in from as far northeast as Grundy and Black Hawk Counties, though it was only three quarters of an inch in diameter. Attention then shifted to the tornadic storms that formed near the dry line. During the afternoon, six more tornadoes touched down in Iowa, several of which were long track tornadoes. The first touched down in Taylor County and tracked through Adams, Cass, and Adair Counties. This tornado had was an F4 intensity tornado in parts of Adair and Adams Counties. Damage was extensive with $1,000,000 damage reported in both Adams and Adair Counties. Entire farmsteads were swept clean by the tornado. At one time this tornado was a mile wide wedge with a damage path nearly two miles wide due to the circulation around the tornado. Eyewitness reports indicated that the tornado split into two distinct tornadoes at times, similar to what occurred with the intense F4 tornado in Adair County of 27 May 1995. One of the farmsteads hit near Nodaway was levelled. Reports indicated that a check was blown from the house nearly 100 miles and was found in the town of Jefferson in Greene County. Other checks and papers were found strewn along the path, stretching from Jefferson all the way back to northwest Taylor County. In Adair County, one account indicated pieces of sheet metal from one farm was lifted and deposited six miles away from the farm. Two people were injured by this tornado, one in Adams County with the other in Adair County. One of the injuries Adair County was serious as a man suffered a broken back when the tornado lifted his semi-tractortrailer truck from the Interstate and threw it into a nearby field. The other injuries from this tornado were minor enough that the people were taken to the hospital, treated, and released. There was one account of a horse being picked up by the tornado. It was lifted into the air and thrown through a stand of pine trees 40 feet high. The horse suffered serious injuries and required significant medical attention do to lacerations. The horse amazingly did survive against all odds, though was said would likely lose sight in one eye. The next tornado touched down in Union County and tracked across Madison and Dallas Counties. This tornado had an F4 strength in Union and decreased to a strong F2 in Madison Counties before intensifying again to near F3 strength as it headed into Dallas County. Damage in Union County was around $2,000,000, and around $350,000 in Madison County. There was one person injured by this tornado in Union County. In an amazing account, the Union County Sheriff reported watching as the tornado lifted the car in front of him 35 feet in the air and throwing it 250 feet. The driver was inside during this time and came out of the situation uninjured. Five coal cars were knocked off the tracks in Union County by the tornado as well. This tornado also had a double structure. From eye witness accounts, which also can be shown on Doppler radar imagery, suggest a small rope like tornado passed through the Twelve Mile Lake area shortly before the passage of the main tornado. The next tornado was a weak tornado which touched down about 4 miles west of downtown Des Moines. The tornado did little damage, but did affect one house and several trees. The tornado was seen by a local television sky camera. A short time later, an F2 tornado touched down in Warren County and tracked into southeast Polk County. The track was over rural areas and damage from it was relatively minor. A more significant F3 tornado tracked from northern Lucas County, and weakened to an F2 as it moved across Warren, part of marion, and into Jasper County. One house was destroyed in Lucas County with the four people inside sustaining minor injuries. Once again, this tornado tracked across mostly rural areas, though it did hit a business and two homes in Jasper County and did $1,000,000 in damage. One person was injured in Jasper County. The last tornado touched down in Davis County at Bloomfield and tracked northeast into Wapello County with a maximum strength of F3. Damage in Davis County was over $500,000 as 64 homes and businesses were damaged in the Bloomfield area. To the northeast, the area of the tornado track was mostly rural and damage was limited to outbuildings for the most part. One farmstead reported severe damage near Floris in Davis County. The house was nearly levelled and several outbuildings were completely destroyed. Parts of the house and outbuildings were found as far as 5 miles away from the farmstead. As the storms moved north, high winds were produced over Story County east of Story City. High winds toppled a tractor semi-trailer truck east of Story City on Interstate 35, injuring the driver. Two cars and a truck were also blown off Interstate 35 in Hamilton County. Four people were injured. Two were taken to the hospital, treated, and released. Two were listed in serious condition, one with a neck fracture, the other with a shoulder fracture. The later incident appeared to be from the rear flank downdraft behind the storm and not the initial gust front. From the preliminary data, 178 homes and business were damaged or destroyed by the tornadic storms as well as countless outbuildings. There were several reports of livestock loss as well. It is truly amazing that there was no loss of life during this event and even more amazing is the fact that the injuries that did occur were all minor. Twenty counties in Iowa experienced serious damage from the storms of the day. Iowa Governor Vilsack declared several counties in Iowa disaster areas. These included Taylor, Union, Adams, and Adair Counties. High winds accompanied the storms as the moved through Appanoose County. A local gas station recorded an 81 MPH wind gust as the storms cut a half mile wide swath of destruction west of Moravia. There were numerous reports of cattle killed by the storms. Some were killed by the tornadoes and flying debris, others by lightning. Reports in Adair County, northwest of Fontanelle indicated about 25 head of cattle were struck by lightning shortly before a tornado moved through that area. As the area of storms that produced the high winds north of Ames in central Iowa moved north, they lost their punch. A few of the storms did remain quite strong however. As the area of thunderstorms moved through Cerro Gordo County, high winds blew down a 60 foot corn crib and did some other damage on a farm near Rockwell.
46.01988-05-08240°45'N / 92°29'W40°54'N / 92°10'W15.00 Miles60 Yards0025.0M0Davis
46.41963-04-18241°02'N / 90°45'W0025K0Warren
46.52006-04-02241°18'N / 91°42'W41°18'N / 91°42'W1.00 Mile75 Yards0025K0Washington
 Brief Description: Rated F2 A supercell spawned a tornado on the west side of Washington at West Main Street and moved northeast for 1 mile. A garage was competely unroofed and a shed was destroyed. Numerous trees were snapped along the path and metal sheeting was torn off a business near the end of the path. Near environmental, model, and radar data suggests that if the subcloud layer could have been slighly more unstable, a much stronger tornado would probably have occurred causing significant damage.
46.61999-04-08340°45'N / 92°25'W40°52'N / 92°16'W11.00 Miles400 Yards00550K0Davis
 Brief Description: As mentioned in the narrative above, an intense low pressure formed to the southwest of Iowa. The low tracked northeast and lifted into eastern Nebraska. Ahead of the low, a strong low level jet of around 60 knots continued through the day. A nearly stationary frontal boundary extended east from the low. It lifted into southeast Nebraska during the day, but made little progress into southern Iowa. Lines of thunderstorms formed along the boundary through the day and lifted north rapidly. These storms were elevated in nature and as a result produced most of their severe weather in the form of hail. As the day unfolded, a sharp dry line was clearly evident on the satellite as early as 1600 UTC across Kansas. This line raced east during the day. By afternoon, a speed max had rotated around the upper low to the southwest with wind speeds measured by the Lathrop wind profiler at 100 knots at 500 mb by mid afternoon. Jet stream winds were in excess of 120 knots at the same time. Combined with the dynamic situation mentioned above, considerable moisture convergence took place near the triple point between the warm front and the dry line. Surface dew points pooled into to the mid 60s to even a few 70 degree F. dew point readings over northwest Missouri, southeast Nebraska, and southwest Iowa. Meanwhile, dew points fell into the upper 20s over northeast Kansas and south central Nebraska behind the dry line, with teens over central and south central Kansas. Thunderstorms erupted along the dry line by mid day and advanced east through the afternoon. Low level helicity values topped out between 500 and 600 (m/s)**2 just before the first tornadoes formed. Most of the storms in the warm sector became tornadic quickly. The northern limit of the tornado tracks extended about 10 miles or so north of the warm front. Tracks became intermittent very quickly as soon as the storms crossed the surface warm front due to the layer of very cold air just north of the front. Surface temperatures on the cold side of the front were only in the upper 40s to mid 50s. The entire day was very active. Initially, warm air advection thunderstorms produced hail at many locations of central and northern Iowa. Most of is was just below severe levels however. The activity that developed during the afternoon was a combination of warm air advection and the approach of the dryline. At the beginning of the event, the main weather feature was in the form of hail. There were numerous reports of hail three quarters to one and three quarters inch in diameter. The largest hail fell in Guthrie and Dallas Counties with reports of golf ball size hail. One of the storms in the initial wave of afternoon activity became stronger as it moved into southern Story County. Initially, high winds of 60 MPH or more swept through Sheldahl area of Boone County. Greene County was also affected by high winds from the storms. A tornado dropped out of the storm as it moved into the Slater area and was on the ground for about 2 miles. Initial estimates showed 44 homes and businesses damaged in Story County, one was destroyed with major damage to another. Thirty six homes and four businesses were damaged in the town of Slater. Two people were injured during the passage of the tornado. One of the injuries involved a 70 year old man who was picked up by the tornadoes winds and thrown about 10 feet before he latched on to something. His shoulder was dislocated and he required 6 stitches due to his injuries in his hand. High winds northeast of Slater knocked several cars of a Burlington Northern freight train off the tracks after they were blown more than one quarter mile down the track. It was not possible to determine of the cars were knocked off by the tornado or high winds however. This band of storms continue to race and develop northeast through the afternoon. Damage became more sporadic, however high winds occurred as far northeast as Hardin County, with 70 MPH winds reported near New Providence. Hail reports came in from as far northeast as Grundy and Black Hawk Counties, though it was only three quarters of an inch in diameter. Attention then shifted to the tornadic storms that formed near the dry line. During the afternoon, six more tornadoes touched down in Iowa, several of which were long track tornadoes. The first touched down in Taylor County and tracked through Adams, Cass, and Adair Counties. This tornado had was an F4 intensity tornado in parts of Adair and Adams Counties. Damage was extensive with $1,000,000 damage reported in both Adams and Adair Counties. Entire farmsteads were swept clean by the tornado. At one time this tornado was a mile wide wedge with a damage path nearly two miles wide due to the circulation around the tornado. Eyewitness reports indicated that the tornado split into two distinct tornadoes at times, similar to what occurred with the intense F4 tornado in Adair County of 27 May 1995. One of the farmsteads hit near Nodaway was levelled. Reports indicated that a check was blown from the house nearly 100 miles and was found in the town of Jefferson in Greene County. Other checks and papers were found strewn along the path, stretching from Jefferson all the way back to northwest Taylor County. In Adair County, one account indicated pieces of sheet metal from one farm was lifted and deposited six miles away from the farm. Two people were injured by this tornado, one in Adams County with the other in Adair County. One of the injuries Adair County was serious as a man suffered a broken back when the tornado lifted his semi-tractortrailer truck from the Interstate and threw it into a nearby field. The other injuries from this tornado were minor enough that the people were taken to the hospital, treated, and released. There was one account of a horse being picked up by the tornado. It was lifted into the air and thrown through a stand of pine trees 40 feet high. The horse suffered serious injuries and required significant medical attention do to lacerations. The horse amazingly did survive against all odds, though was said would likely lose sight in one eye. The next tornado touched down in Union County and tracked across Madison and Dallas Counties. This tornado had an F4 strength in Union and decreased to a strong F2 in Madison Counties before intensifying again to near F3 strength as it headed into Dallas County. Damage in Union County was around $2,000,000, and around $350,000 in Madison County. There was one person injured by this tornado in Union County. In an amazing account, the Union County Sheriff reported watching as the tornado lifted the car in front of him 35 feet in the air and throwing it 250 feet. The driver was inside during this time and came out of the situation uninjured. Five coal cars were knocked off the tracks in Union County by the tornado as well. This tornado also had a double structure. From eye witness accounts, which also can be shown on Doppler radar imagery, suggest a small rope like tornado passed through the Twelve Mile Lake area shortly before the passage of the main tornado. The next tornado was a weak tornado which touched down about 4 miles west of downtown Des Moines. The tornado did little damage, but did affect one house and several trees. The tornado was seen by a local television sky camera. A short time later, an F2 tornado touched down in Warren County and tracked into southeast Polk County. The track was over rural areas and damage from it was relatively minor. A more significant F3 tornado tracked from northern Lucas County, and weakened to an F2 as it moved across Warren, part of marion, and into Jasper County. One house was destroyed in Lucas County with the four people inside sustaining minor injuries. Once again, this tornado tracked across mostly rural areas, though it did hit a business and two homes in Jasper County and did $1,000,000 in damage. One person was injured in Jasper County. The last tornado touched down in Davis County at Bloomfield and tracked northeast into Wapello County with a maximum strength of F3. Damage in Davis County was over $500,000 as 64 homes and businesses were damaged in the Bloomfield area. To the northeast, the area of the tornado track was mostly rural and damage was limited to outbuildings for the most part. One farmstead reported severe damage near Floris in Davis County. The house was nearly levelled and several outbuildings were completely destroyed. Parts of the house and outbuildings were found as far as 5 miles away from the farmstead. As the storms moved north, high winds were produced over Story County east of Story City. High winds toppled a tractor semi-trailer truck east of Story City on Interstate 35, injuring the driver. Two cars and a truck were also blown off Interstate 35 in Hamilton County. Four people were injured. Two were taken to the hospital, treated, and released. Two were listed in serious condition, one with a neck fracture, the other with a shoulder fracture. The later incident appeared to be from the rear flank downdraft behind the storm and not the initial gust front. From the preliminary data, 178 homes and business were damaged or destroyed by the tornadic storms as well as countless outbuildings. There were several reports of livestock loss as well. It is truly amazing that there was no loss of life during this event and even more amazing is the fact that the injuries that did occur were all minor. Twenty counties in Iowa experienced serious damage from the storms of the day. Iowa Governor Vilsack declared several counties in Iowa disaster areas. These included Taylor, Union, Adams, and Adair Counties. High winds accompanied the storms as the moved through Appanoose County. A local gas station recorded an 81 MPH wind gust as the storms cut a half mile wide swath of destruction west of Moravia. There were numerous reports of cattle killed by the storms. Some were killed by the tornadoes and flying debris, others by lightning. Reports in Adair County, northwest of Fontanelle indicated about 25 head of cattle were struck by lightning shortly before a tornado moved through that area. As the area of storms that produced the high winds north of Ames in central Iowa moved north, they lost their punch. A few of the storms did remain quite strong however. As the area of thunderstorms moved through Cerro Gordo County, high winds blew down a 60 foot corn crib and did some other damage on a farm near Rockwell.
46.61970-06-12239°59'N / 91°47'W40°01'N / 91°40'W6.20 Miles100 Yards0025K0Lewis
47.01982-03-12240°20'N / 90°41'W0125K0Mcdonough
47.21967-01-24241°18'N / 91°22'W41°21'N / 91°20'W3.00 Miles250 Yards000K0Louisa
47.41964-04-21340°25'N / 90°44'W40°30'N / 90°29'W14.10 Miles17 Yards0025K0Mcdonough
47.62007-06-01341°16'N / 91°11'W41°19'N / 91°07'W6.00 Miles774 Yards011.0M0KLouisa
 Brief Description: EVENT NARRATIVE: The tornado touched down on the southern edge of Grandview. It moved through the center of town intensifying in rural areas as it approached the county line. In Grandview, several homes sustained severe damage. North of Grandview, about 1.5 miles, a farm house was completely destroyed. Other homes and trees along the path sustained damage. The tornado crossed the Louisa-Muscatine county line just south of Fruitland, IA. EPISODE NARRATIVE: A line of thunderstorms pivoted northeast into parts of southeast Iowa during the mid-morning hours of June 1st. Much of the area was just breaking out of a blanket of dense fog where visibilities dropped to less than a quarter mile. Dew point temperatures were in the middle 60s to around 70 degrees. The line of storms appeared to become more broken through the late morning hours, while the area from Iowa City to Waterloo appeared to stratify out into a large area of showers. Just before 12:00 pm CDT, rapid intensification of storm cells on the southeast end of the original line occurred as it moved into northern portions of Louisa County. A tornado touched down just south of Grandview, IA and moved northeast through Fruitland, IA and on to the southwest parts of Muscatine, IA. The tornado then lifted and as the storm cell continued to move northeast across Muscatine County. The super-cell re-intensified as it entered the southeast part of Cedar County just before 1 pm producing a brief tornado near Wilton, IA. The storm then moved across northwest parts of Scott County and Clinton County producing damaging wind gusts and large hail. The super-cell continued northeast into Jackson County producing a tornado near Bellevue around 2:30 pm, which moved across the Mississippi River into Jo Daviess County before lifting. The storm produced yet another tornado just south of Scales Mound, IL around 3:15 pm before moving into southwest Wisconsin and dissipating. During the early afternoon hours, additional storms strengthened on the south end of the original line of storms, which went on to produce wind damage and large hail as they moved through northwest Illinois through the late afternoon hours.
47.61959-05-09341°12'N / 91°59'W41°17'N / 91°54'W6.60 Miles200 Yards00250K0Keokuk
48.11961-05-14339°43'N / 91°18'W40°43'N / 90°13'W89.60 Miles100 Yards002.5M0Pike
48.71954-04-30240°48'N / 91°25'W41°50'N / 90°57'W75.30 Miles200 Yards0025K0Des Moines
49.11982-09-13240°57'N / 92°27'W40°59'N / 92°11'W13.00 Miles100 Yards002.5M0Wapello
49.21988-05-08241°20'N / 91°26'W41°23'N / 91°24'W7.00 Miles60 Yards0025.0M0Louisa


* The information on this page is based on the global volcano database, the U.S. earthquake database of 1638-1985, and the U.S. Tornado and Weather Extremes database of 1950-2010.


 
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