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Boulder County Natural Disasters and Weather Extremes

 
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The chance of earthquake damage in Boulder County is lower than Colorado average and is lower than the national average. The risk of tornado damage in Boulder County is higher than Colorado average and is higher than the national average.

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

Earthquake Index, #8

Boulder County
0.86
Colorado
1.32
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, #19

Boulder County
0.0009
Colorado
0.0009
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, #9

Boulder County
164.96
Colorado
117.98
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 6,533 other weather extremes events within 50 miles of Boulder County were recorded from 1950 to 2010. The following is a break down of these events:

TypeCountTypeCountTypeCountTypeCountTypeCount
Avalanche:0Blizzard:7Cold:1Dense Fog:1Drought:42
Dust Storm:0Flood:304Hail:4,459Heat:0Heavy Snow:43
High Surf:0Hurricane:0Ice Storm:0Landslide:0Strong Wind:47
Thunderstorm Winds:993Tropical Storm:0Wildfire:33Winter Storm:35Winter Weather:7
Other:561 

Volcanos Nearby

A total of 1 volcano is found in or near Boulder County.

Distance (miles)NameRegionLatitudeLongitudeElevation (foot)TypeStatusLast Eruption
91.8DotseroUS-Colorado, United States39.65-107.032230MaarRadiocarbonLast known eruption B.C. (Holocene)

Historical Earthquake Events

A total of 28 historical earthquake events that had recorded magnitudes of 3.5 or above found in or near Boulder County.

Distance (miles)DateMagnitudeDepth (km)LatitudeLongitude
39.31967-08-095.3N/A39.9-104.7
37.51967-11-275.2N/A40-104.7
42.21966-01-055N/A39.8-104.7
25.01965-02-164.9N/A39.9-105
34.41967-04-104.8N/A39.9-104.8
48.81965-09-144.8N/A39.5-104.9
25.81965-09-294.7N/A39.8-105.1
33.31965-11-214.7N/A39.8-104.9
37.71965-09-144.7N/A39.8-104.8
44.31965-09-144.7N/A39.9-104.6
20.71965-02-164.6N/A39.9-105.1
37.71965-09-294.6N/A39.8-104.8
37.71965-11-214.6N/A39.8-104.8
37.71965-09-294.6N/A39.8-104.8
37.91965-07-314.6N/A39.7-104.9
46.91963-07-024.6N/A39.8-104.6
37.71965-09-134.5N/A39.8-104.8
34.41971-08-084.4539.9-104.8
39.31965-11-214.4N/A39.9-104.7
39.31967-11-274.4N/A39.9-104.7
39.31967-04-274.4N/A39.9-104.7
39.31966-11-144.3N/A39.9-104.7
41.81967-02-034.3N/A39.7-104.8
20.71970-05-234.1539.9-105.1
44.31962-12-054N/A39.9-104.6
26.91981-04-023.8939.91-104.95
44.31967-11-153.7N/A39.9-104.6
42.21962-12-043.5N/A39.8-104.7

Historical Tornado Events

A total of 33 historical tornado events that had recorded magnitude of 2 or above found in or near Boulder County.

Distance (miles)DateMagnitudeStart Lat/LogEnd Lat/LogLengthWidthFatalitiesInjuriesProperty DamageCrop DamageAffected County
11.01980-10-15240°01'N / 105°13'W1.50 Miles50 Yards0025K0Boulder
20.21988-06-05239°57'N / 105°04'W0.50 Mile50 Yards00250K0Boulder
22.81988-06-05240°02'N / 104°59'W40°02'N / 104°58'W1.00 Mile50 Yards00250K0Weld
23.01988-06-05240°00'N / 104°58'W40°02'N / 104°59'W1.00 Mile50 Yards00250K0Adams
27.01981-06-03239°52'N / 104°59'W2.30 Miles133 Yards04225.0M0Adams
31.81981-06-03239°43'N / 105°03'W39°44'N / 105°02'W002.5M0Jefferson
31.81976-06-04240°13'N / 104°49'W1.50 Miles200 Yards0025K0Weld
31.81981-06-03239°44'N / 105°02'W39°44'N / 105°01'W002.5M0Denver
35.11988-06-15239°44'N / 104°56'W0.50 Mile400 Yards002.5M0Denver
35.11988-06-15339°44'N / 104°56'W2.50 Miles200 Yards0725.0M0Denver
35.12008-05-22340°13'N / 104°45'W40°33'N / 104°57'W24.00 Miles1760 Yards178147.0M0KWeld
 Brief Description: EVENT NARRATIVE: A powerful tornado swept north-northwestward across Weld County and into Larimer County, carving a path of destruction, nearly 39 miles in length. The tornado, up to one-mile wide at times, initially touched down northeast of Platteville and finally lifted 6 miles west-northwest of Wellington. A tornado assessment in the aftermath of the tornado revealed extensive areas of damage. On the enhanced Fujita Scale there were pockets of EF3 damage, mainly near the Missile Silo Park Campground, and to businesses and home in eastern Windsor. There was one fatality, and 78 injuries. One man was killed when he tried to escape the trailer park in his motor home. Preliminary estimates from FEMA indicated 850 homes were damaged, and nearly 300 homes were significantly damaged or destroyed. Privately insured damages totaled $147 million, and the Poudre Valley Rural Electric Associated reported $1 million of damage to electric transmission lines. EPISODE NARRATIVE: A powerful tornado swept north-northwestward across Weld County, carving a path of destruction, nearly 39 miles in length. The tornado, up to one-mile wide at times, initially touched down northeast of Platteville and finally lifted 6 miles west-northwest of Wellington. A tornado assessment in the aftermath of the tornado revealed extensive areas of damage. On the enhanced Fujita Scale there were pockets of EF3 damage, mainly near the Missile Silo Park Campground, and to businesses and home in eastern Windsor. Farmers also reported extensive damage to crops and irrigation equipment. There was one fatality, and 78 injuries ranging from broken bones to minor cuts and lacerations. One man was killed when he tried to escape a trailer park in his motor home. Tractor trailers were flipped along U.S. Highway 85, and over 200 power poles were snapped or blown down. Approximately 60,000 people were left without electricity. The tornado overturned 15 railroad cars and destroyed a lumber car on the Great Western Railway of Colorado. The tornado also flattened Windsor's main feedlot and destroyed a dairy barn. Most of the four-hundred cows were killed in the tornado or destroyed later. In addition to the damaging winds, the thunderstorm also produced hail up to the size of baseballs. Another tornado rated an EF1, from a separate severe thunderstorm, briefly touched down near Dacono and destroyed 5 buildings. The tornado overturned a five-wheel trailer and injured the man who was sitting inside. Preliminary estimates from FEMA indicated 850 homes were damaged, and nearly 300 homes were significantly damaged or destroyed. The Poudre Valley Rural Electric Association reported $1 million of damage to electric transmission lines. Privately insured damages totaled $147 million, making it the state's 4th costliest disaster.
35.51976-05-30239°48'N / 104°53'W39°50'N / 104°47'W5.40 Miles67 Yards00250K0Adams
36.41957-05-30240°28'N / 104°56'W40°28'N / 104°53'W1.90 Miles33 Yards003K0Larimer
36.91957-05-30240°30'N / 104°56'W40°28'N / 104°54'W1.30 Miles33 Yards013K0Weld
37.11986-06-08239°43'N / 104°54'W1.00 Mile50 Yards062.5M0Denver
37.31957-05-30240°28'N / 104°53'W40°27'N / 104°52'W003K0Weld
37.61976-06-04240°35'N / 105°05'W0.50 Mile300 Yards000K0Larimer
38.11987-07-02239°53'N / 104°44'W1.00 Mile250 Yards003K0Adams
39.11986-06-08239°43'N / 104°51'W39°43'N / 104°51'W0.10 Mile50 Yards002.5M0Arapahoe
40.41958-06-08240°04'N / 104°42'W40°06'N / 104°34'W7.10 Miles33 Yards003K0Weld
40.51957-05-30240°27'N / 104°52'W40°33'N / 104°49'W7.20 Miles33 Yards003K0Weld
41.01975-05-18339°48'N / 104°44'W39°51'N / 104°41'W4.10 Miles440 Yards000K0Adams
41.11984-05-18240°07'N / 104°40'W40°12'N / 104°35'W5.00 Miles50 Yards0025K0Weld
45.01982-06-25240°23'N / 104°38'W1.00 Mile200 Yards000K0Weld
45.91986-06-08239°50'N / 104°36'W2.00 Miles100 Yards000K0Adams
46.21984-05-18240°07'N / 104°35'W40°10'N / 104°28'W5.00 Miles50 Yards000K0Weld
46.91978-05-17239°38'N / 104°45'W0.50 Mile33 Yards00250K0Adams
47.21987-06-20239°46'N / 104°37'W1.00 Mile30 Yards000K0Adams
47.21984-05-18240°11'N / 104°34'W40°14'N / 104°28'W5.00 Miles50 Yards003K0Weld
47.71955-07-10240°31'N / 104°42'W40°35'N / 104°44'W4.30 Miles33 Yards003K0Weld
47.91985-07-19239°32'N / 104°52'W0.50 Mile40 Yards00250K0Douglas
48.41952-05-15340°20'N / 104°34'W40°15'N / 104°28'W7.40 Miles150 Yards0525K0Weld
48.81982-06-12339°49'N / 104°32'W39°53'N / 104°32'W3.00 Miles400 Yards003K0Adams


* 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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