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Allegheny County Natural Disasters and Weather Extremes

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

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

Earthquake Index, #61

Allegheny County
0.00
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

Allegheny 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, #26

Allegheny County
109.97
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 13,953 other weather extremes events within 50 miles of Allegheny County were recorded from 1950 to 2010. The following is a break down of these events:

TypeCountTypeCountTypeCountTypeCountTypeCount
Avalanche:0Blizzard:6Cold:28Dense Fog:0Drought:13
Dust Storm:0Flood:2,338Hail:2,788Heat:10Heavy Snow:179
High Surf:0Hurricane:0Ice Storm:54Landslide:0Strong Wind:210
Thunderstorm Winds:7,886Tropical Storm:1Wildfire:3Winter Storm:86Winter Weather:14
Other:337 

Volcanos Nearby

No volcano is found in or near Allegheny County.

Historical Earthquake Events

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

No historical earthquake events found in or near Allegheny County.

Historical Tornado Events

A total of 41 historical tornado events that had recorded magnitude of 2 or above found in or near Allegheny County.

Distance (miles)DateMagnitudeStart Lat/LogEnd Lat/LogLengthWidthFatalitiesInjuriesProperty DamageCrop DamageAffected County
8.11975-06-04240°35'N / 80°13'W40°11'N / 79°32'W45.30 Miles30 Yards000K0Beaver
9.31956-05-13240°22'N / 79°52'W0.70 Mile200 Yards05250K0Allegheny
11.71963-08-03340°19'N / 79°53'W27025.0M0Allegheny
14.51983-05-22240°17'N / 79°53'W40°18'N / 79°47'W5.00 Miles200 Yards002.5M0Allegheny
17.91980-06-03440°39'N / 79°44'W40°37'N / 79°42'W1.90 Miles33 Yards020250.0M0Allegheny
18.91956-05-12240°37'N / 80°17'W00250K0Beaver
19.51985-05-31340°47'N / 80°09'W40°43'N / 79°44'W22.00 Miles243 Yards68025.0M0Butler
20.71983-05-22240°18'N / 79°47'W40°20'N / 79°30'W14.00 Miles200 Yards062.5M0Westmoreland
21.01980-06-03440°37'N / 79°42'W40°36'N / 79°33'W7.60 Miles33 Yards00250.0M0Westmoreland
21.81954-06-26240°15'N / 79°41'W0425K0Westmoreland
22.41981-04-28240°44'N / 79°44'W0.50 Mile33 Yards0025K0Butler
25.41980-06-03440°36'N / 79°33'W40°35'N / 79°30'W2.30 Miles33 Yards0120250.0M0Armstrong
25.51964-06-15240°18'N / 79°33'W2.00 Miles800 Yards04250K0Westmoreland
25.91990-06-30240°07'N / 80°09'W0.20 Mile250 Yards0025K0Washington
26.01954-06-10240°45'N / 80°15'W40°51'N / 80°11'W7.30 Miles33 Yards0125K0Beaver
26.31981-07-20240°51'N / 80°00'W00250K0Butler
28.61985-05-31340°49'N / 80°28'W40°47'N / 80°09'W17.00 Miles243 Yards34025.0M0Beaver
29.31954-06-10240°51'N / 80°11'W40°53'N / 80°10'W0225K0Lawrence
30.01980-06-03240°32'N / 79°28'W40°32'N / 79°22'W4.90 Miles33 Yards00250K0Indiana
31.41983-05-22240°20'N / 79°30'W40°27'N / 79°17'W13.00 Miles200 Yards042.5M0Westmoreland
31.81980-05-12240°24'N / 79°23'W2.20 Miles20 Yards00250K0Westmoreland
32.31965-11-16240°06'N / 79°36'W40°07'N / 79°35'W03250K0Fayette
32.51976-07-11340°21'N / 79°30'W40°16'N / 79°18'W11.80 Miles67 Yards1172.5M0Westmoreland
32.61965-11-16240°05'N / 79°37'W40°06'N / 79°36'W03250K0Westmoreland
34.01954-06-01240°55'N / 79°48'W40°57'N / 79°44'W3.00 Miles150 Yards0025K0Butler
34.41966-04-23240°42'N / 79°24'W1.00 Mile17 Yards0025K0Armstrong
37.31997-08-15240°20'N / 79°19'W40°21'N / 79°16'W3.50 Miles200 Yards02800K10KWestmoreland
 Brief Description: A severe thunderstorm produced a tornado that produced substantial damage in a residential area east-northeast of Latrobe along the foothills of the Chestnut Ridge. The tornado first touched down 1 mile west of Derry. The tornado completely destroyed a large tier of metal stadium bleachers at a high school football field and wrapped them against a utility pole. A nearby roof of a business was damaged and a mobile home was completely destroyed and a few mobile homes sustained damage. The tornado then tracked through a rural area, damaging some farm buildings and downing field corn. The tornado continued its rapid (estimated forward speed 50-60 miles per hour) northeast track and caused significant damage in a mobile home park in Derry. The tornado crossed Route 217 and downed trees across railroad tracks and then entered a residential area in Millwood. One frame house in Millwood was severely damaged and part of a room addition collapsed and trapped a resident, who was treated at the scene. A resident of a mobile home sustained minor injuries as well. Numerous trees were uprooted and large branches and power lines were downed along the track of the storm. One home along Route 217 had a branch embedded into the house siding. The tornado was estimated to have wind speeds of between 90 and 120 miles per hour, briefly attaining an F-2 rating on the Fujita Tornado Scale. All tolled, 7-8 mobile homes were destroyed (3 totally decimated), 10-12 sustained major damage, 15-18 sustained minor damage. One frame house was heavily damaged and about 10 sustained minor damage. One car was destroyed when a tree fell on it. Parked next to the auto was another car with two occupants that were not injured. About 10 other cars were damaged. An open-air church in Millwood was also heavily damaged. The tornado appeared to have dissipated as it entered the heavily wooded slopes of the Chestnut Ridge.
39.31983-05-22240°27'N / 79°17'W40°30'N / 79°11'W6.00 Miles200 Yards002.5M0Indiana
39.81981-07-26240°34'N / 79°14'W00250K0Indiana
41.11967-07-24240°49'N / 80°41'W40°49'N / 80°33'W6.50 Miles277 Yards02250K0Columbiana
41.31986-10-01239°55'N / 79°45'W39°54'N / 79°40'W4.50 Miles100 Yards022.5M0Fayette
41.41977-09-24241°00'N / 80°21'W002.5M0Lawrence
42.32002-04-28240°34'N / 79°14'W40°37'N / 79°09'W5.00 Miles250 Yards01750K0Indiana
 Brief Description: A storm spawning two separate tornadoes passed over southern Armstrong County, continuing eastward into Indiana County. The first tornado, an F0, touched down at approximately 2:45 PM EST just south of the town of Spring Church in Armstrong County. It traveled east about 3 miles before crossing into Indiana County approximately 1 mile east of Maysville at 2:52 PM EST. This tornado continued traveling to the east for another mile, finally dissipating near the community of Iselin at around 2:55 PM EST. The maximum estimated winds with this tornado were about 70 MPH. Damage from this first tornado included numerous trees which were toppled or snapped. A small steeple was toppled, and a swimming pool was destroyed. There were several trees toppled onto houses, and some houses suffered minor wind damage. A garage was damaged, and a house under construction was lifted off the foundation. The same storm produced another stronger tornado, an F2, which touched down in Indiana County approximately 6 miles southwest of the city of Indiana at 3:00 PM EST. This F2 traveled to the east across Center Township for approximately 5 miles, dissipating just south of Indiana at 3:06 PM EST. The estimated maximum winds were around 135 MPH. This F2 tornado produced a swath of damage as it traveled eastward across Indiana County. One house was totally destroyed, and debris from this house was blown downwind. In this same area, a car was turned over and trees were stripped of leaves. An adjacent house exhibited damage from hail or flying projectiles on several sides. The house immediately to the north of the destroyed house lost part of its east-facing roof. There were at least an additional 18 houses damaged (roofs, shingles, siding, etc.). Several garages and barns were either toppled or snapped. A large sign from a hotel was blown down onto a car sales lot. Two cars were crushed and 18 other vehicles were damaged. One moderate injury was reported with this tornado.
43.11953-05-30240°24'N / 79°12'W40°24'N / 79°08'W1.90 Miles33 Yards0025K0Indiana
43.81951-06-27240°35'N / 79°15'W40°52'N / 79°11'W19.70 Miles33 Yards003K0Armstrong
44.71986-09-23240°58'N / 79°26'W0.50 Mile40 Yards012.5M0Armstrong
45.61992-08-08241°04'N / 80°21'W2.00 Miles150 Yards0025K0Lawrence
46.31968-06-25239°51'N / 80°19'W01250K0Greene
46.61986-10-03241°08'N / 80°14'W41°08'N / 80°02'W9.00 Miles123 Yards002.5M0Mercer
47.01985-05-31240°53'N / 80°51'W40°50'N / 80°35'W15.00 Miles220 Yards02025.0M0Columbiana
48.52001-04-09241°02'N / 80°32'W41°02'N / 80°32'W4.00 Miles75 Yards00200K0Mahoning
 Brief Description: A weak F2 tornado touched down near Lowellville in eastern Mahoning County. The tornado had a intermittent damage path approximately four miles in length and 75 yards in width. Two homes, one business and two garages suffered significant damage with around a dozen other homes sustaining minor damage.


* 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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