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Adams County Natural Disasters and Weather Extremes

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

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

Earthquake Index, #23

Adams County
0.06
Pennsylvania
0.17
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

Adams County
0.0000
Pennsylvania
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, #13

Adams County
137.29
Pennsylvania
109.77
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 15,913 other weather extremes events within 50 miles of Adams County were recorded from 1950 to 2010. The following is a break down of these events:

TypeCountTypeCountTypeCountTypeCountTypeCount
Avalanche:0Blizzard:12Cold:101Dense Fog:89Drought:174
Dust Storm:0Flood:2,293Hail:2,397Heat:291Heavy Snow:215
High Surf:23Hurricane:3Ice Storm:36Landslide:0Strong Wind:424
Thunderstorm Winds:7,958Tropical Storm:10Wildfire:21Winter Storm:201Winter Weather:247
Other:1,418 

Volcanos Nearby

No volcano is found in or near Adams County.

Historical Earthquake Events

A total of 2 historical earthquake events that had recorded magnitudes of 3.5 or above found in or near Adams County.

Distance (miles)DateMagnitudeDepth (km)LatitudeLongitude
44.31964-05-124.53340.2-76.5
45.61984-04-234.4539.92-76.36

Historical Tornado Events

A total of 43 historical tornado events that had recorded magnitude of 2 or above found in or near Adams County.

Distance (miles)DateMagnitudeStart Lat/LogEnd Lat/LogLengthWidthFatalitiesInjuriesProperty DamageCrop DamageAffected County
4.71976-03-21239°56'N / 77°15'W1.00 Mile50 Yards0025K0Adams
6.91954-04-25239°50'N / 77°14'W39°48'N / 76°59'W13.30 Miles500 Yards0025K0Adams
11.11983-05-22339°42'N / 77°14'W39°43'N / 77°12'W1.00 Mile37 Yards0025K0Carroll
11.51980-06-07339°56'N / 77°01'W1.50 Miles400 Yards00250K0Adams
11.81983-05-22339°42'N / 77°15'W39°42'N / 77°14'W1.00 Mile37 Yards0025K0Frederick
12.51978-08-28239°48'N / 77°02'W39°45'N / 77°00'W3.30 Miles20 Yards003K0Adams
14.21980-06-07240°01'N / 77°04'W40°02'N / 77°01'W2.30 Miles800 Yards002.5M0Adams
15.21978-08-28239°45'N / 77°00'W39°43'N / 76°59'W1.90 Miles33 Yards003K0York
15.52001-09-24239°44'N / 76°59'W39°48'N / 76°56'W5.00 Miles200 Yards00900K0York
 Brief Description: A tornado touched down near Grand Valley Road at 17:33 EST about 5 miles South of Hanover PA. The tornado proceded northward, through Parkville then lifting to the north of Blooming Grove at 17:40 EST. The path of the tornado was about 5 miles in length but not always on the ground while the width varied from 50 to 200 yards. The top wind speeds were estimated at 110 to 120 mph. There were no injuries or deaths. Significant damage included 8 homes with roofs torn off, brick and structural damage to several additional homes, 50 to 75 trees knocked down, 38 cars damaged at a car dealership, significant roof and water damage to a middle school and administration building, and significant structural damage to a store complex northwest of Blooming Grove.
16.81980-06-07240°02'N / 77°01'W40°02'N / 76°57'W3.30 Miles33 Yards002.5M0York
17.21990-06-08239°49'N / 76°54'W1.00 Mile60 Yards01250K0York
19.51952-04-05339°48'N / 76°59'W39°57'N / 76°43'W17.50 Miles33 Yards042.5M0York
20.11961-04-16340°03'N / 77°31'W00250K0Cumberland
22.21992-10-09240°07'N / 76°57'W2.00 Miles100 Yards002.5M0York
22.91979-05-23239°35'N / 77°00'W2.00 Miles150 Yards002.5M0Carroll
23.71978-08-28239°43'N / 76°59'W39°34'N / 76°47'W14.80 Miles33 Yards000K0Frederick
26.91985-07-31240°10'N / 76°54'W40°09'N / 76°51'W3.00 Miles20 Yards02250K0Lancaster
27.11956-06-13239°57'N / 76°43'W0225K0York
29.31996-07-19339°30'N / 76°59'W39°29'N / 76°57'W2.20 Miles350 Yards035.0M20KCarroll
 Brief Description: One of the most potent tornadoes in recorded history in the state of Maryland tracked for 2 and 1/4 miles through the Mystic Kane and Four Seasons subdivisions just off state route 32 northwest of Gamber. The tornado was a strong F3 (180 mph estimated winds) with multiple vortices. Homes and trees struck by individual vortices sustained the worst damage. There were several eyewitness accounts of the tornado/funnel cloud shortly before touchdown. In all, 66 structures sustained damage. Twelve single-family homes were destroyed, five which lost most of the second story and garages. Three persons were injured. Two children were injured when the tornado blew them out of the second level of one of the homes. Their father suffered cuts and bruises when a wall partially collapsed on him while he was trying the rescue the children. Another dozen homes were deemed temporarily uninhabitable with substantial roof and siding damage. An additional 37 homes, a couple of apartments, and another barn received some damage. Many material items were sucked out of the homes, from bicycles to jewelry. Several automobiles were damaged by fallen and/or flying debris. Debris littered the ground for miles. A barn along route 32 was completely destroyed, and pieces of it were found as far away as 3.5 miles to the southeast of the barn's original location. Dozens of trees were snapped, shredded, debarked, and uprooted. Corn stalks were sucked up leaving six inch stubs as the tornado crossed a field west of route 32. A corn stalk was embedded into the wall of a house 1/2 mile away from the stalk's original location. Numerous airborne missiles (large and small) were generated, puncturing holes into homes and becoming embedded into the ground. A refrigerator was found wrapped around a mailbox. A van was dragged 50 feet, then flipped over two times. Other vehicles were also damaged.
29.81963-03-27240°00'N / 76°51'W40°03'N / 76°32'W17.00 Miles20 Yards0025K0York
30.61969-07-27240°04'N / 76°42'W0.30 Mile100 Yards00250K0York
32.71991-05-06240°05'N / 76°40'W1.00 Mile100 Yards03250K0Lancaster
33.21978-07-31239°24'N / 77°21'W1.50 Miles100 Yards0025K0Frederick
33.21977-04-05240°15'N / 76°50'W2.00 Miles67 Yards012.5M0Dauphin
34.41961-07-29239°58'N / 76°40'W39°59'N / 76°30'W8.80 Miles500 Yards002.5M0York
34.81989-06-15239°58'N / 76°40'W40°02'N / 76°30'W9.00 Miles100 Yards03250K0York
35.01990-10-18239°28'N / 76°49'W0.10 Mile100 Yards05925.0M0Baltimore
36.31970-03-26240°16'N / 76°46'W2.50 Miles50 Yards00250K0Dauphin
37.21970-07-02240°09'N / 76°37'W1.00 Mile1760 Yards0025K0Lancaster
37.41989-06-20240°22'N / 77°30'W2.00 Miles23 Yards0125K0Perry
37.71955-08-19240°24'N / 77°23'W0025K0Chester
37.81967-09-21240°25'N / 77°11'W0.10 Mile30 Yards00250K0Perry
38.32004-09-17239°24'N / 77°33'W39°24'N / 77°39'W3.00 Miles200 Yards005K0Frederick
 Brief Description: An F2 tornado touched down in far northwest Frederick County, on the northwest edge of Catoctin Mountain Park. A thickly forested stand of hardwood trees was snapped off above the bases.
39.71967-10-18240°13'N / 76°45'W40°19'N / 76°36'W10.20 Miles30 Yards011250K0Dauphin
40.11978-07-31239°18'N / 77°04'W0.80 Mile40 Yards00250K0Howard
41.31989-06-15240°02'N / 76°30'W40°02'N / 76°26'W4.00 Miles100 Yards03250K0Lancaster
43.21996-07-19239°23'N / 77°42'W39°21'N / 77°42'W2.00 Miles125 Yards00400K75KWashington
 Brief Description: A moderate tornado (F2) tracked between two mountain ridges in extreme southern Washington Co, knocking down hundreds of trees, including several onto homes which caused substantial damage. At least one barn was completely destroyed in Yarrowsburg. The storm attained maximum strength just south of town (where the trees, including numerous hardwoods, were flattened). The tornado weakened considerably before dissipating along the eastern ridge. Structural and vehicle damage, though not as prevalent as the tree damage, included the following: Portions of roofs from two barns were blown off; minor residential damage, including shattered windows, unhinged shingles, and torn off trim/gutters. Some gravestones were overturned by the winds, and several power lines were knocked down. Several vehicles and vehicle windows were damaged.
43.61989-06-15240°02'N / 76°26'W40°00'N / 76°24'W3.00 Miles100 Yards002.5M0Lancaster
44.02004-07-14340°17'N / 76°35'W40°17'N / 76°35'W7.50 Miles500 Yards0018.0M0Lebanon
 Brief Description: Thunderstorms spawned a strong F3 tornado in southern Lebanon County during the afternoon of July 14. The tornado first touched down in far western Lebanon County at 3:05 pm EDT, about 1 mile west of the town of Campbelltown. The tornado traveled east, and struck a housing development about one quarter mile south of Route 322. A total of 32 homes were destroyed, with another 37 homes sustaining significant damage. An additional 50 homes and 9 farm buildings in the area were damaged by downburst winds associated with the thunderstorm which spawned the tornado. The tornado continued along a path to the east for seven and one half miles. The tornado crossed Route 322 west of Mount Pleasant, and continued east, mainly across fields, until it lifted up about 2 miles northwest of the town of Cornwall at 3:15 pm EDT. The width of the tornado was one quarter mile. Although the tornadic damage was confined to the path described, additional damage occurred outside this path, again associated with downburst winds from the parent thunderstorm. Winds were estimated between 175 and 200 MPH, making this a strong F3 tornado on the Fujita scale. The tornado injured 24 persons, one critically. There were no deaths. The American Red Cross opened a mass care center, where over 50 people required assistance with sheltering. Between 25,000 and 30,000 customers lost power in Lebanon and Berks Counties as a result of the storms.
44.81957-11-19240°18'N / 76°35'W2.00 Miles13 Yards0025K0Lebanon
45.61961-07-29239°59'N / 76°30'W40°02'N / 76°15'W13.40 Miles500 Yards022.5M0Lancaster
46.11953-11-23240°06'N / 76°24'W0.10 Mile20 Yards003K0Lancaster
46.42004-09-18239°42'N / 76°22'W39°44'N / 76°22'W2.00 Miles125 Yards00350K0Harford
 Brief Description: A tornado touched down near a residence off Grier Nursery Road. The storm destroyed two mobile homes, the side of a barn was blown out, structural damage to two homes were noted, and numerous large healthy trees were twisted off near the bases.


* 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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