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Orrstown, PA Natural Disasters and Weather Extremes

 
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The chance of earthquake damage in Orrstown is about the same as Pennsylvania average and is much lower than the national average. The risk of tornado damage in Orrstown 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, #1198

Orrstown, PA
0.04
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

Orrstown, PA
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, #1392

Orrstown, PA
100.76
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 3,562 other weather extremes events within 50 miles of Orrstown, PA were recorded from 1950 to 2010. The following is a break down of these events:

TypeCountTypeCountTypeCountTypeCountTypeCount
Avalanche:0Blizzard:3Cold:31Dense Fog:17Drought:21
Dust Storm:0Flood:558Hail:512Heat:50Heavy Snow:62
High Surf:0Hurricane:0Ice Storm:21Landslide:0Strong Wind:74
Thunderstorm Winds:1,883Tropical Storm:2Wildfire:1Winter Storm:66Winter Weather:48
Other:213 

Volcanos Nearby

No volcano is found in or near Orrstown, PA.

Historical Earthquake Events

No historical earthquake events that had recorded magnitudes of 3.5 or above found in or near Orrstown, PA.

No historical earthquake events found in or near Orrstown, PA.

Historical Tornado Events

A total of 32 historical tornado events that had recorded magnitude of 2 or above found in or near Orrstown, PA.

Distance (miles)DateMagnitudeStart Lat/LogEnd Lat/LogLengthWidthFatalitiesInjuriesProperty DamageCrop DamageAffected County
4.91961-04-16340°03'N / 77°31'W00250K0Cumberland
20.81976-03-21239°56'N / 77°15'W1.00 Mile50 Yards0025K0Adams
22.01989-06-20240°22'N / 77°30'W2.00 Miles23 Yards0125K0Perry
26.41955-08-19240°24'N / 77°23'W0025K0Chester
30.01980-06-07240°01'N / 77°04'W40°02'N / 77°01'W2.30 Miles800 Yards002.5M0Adams
31.31954-04-25239°50'N / 77°14'W39°48'N / 76°59'W13.30 Miles500 Yards0025K0Adams
31.51983-05-22339°42'N / 77°15'W39°42'N / 77°14'W1.00 Mile37 Yards0025K0Frederick
31.91983-05-22339°42'N / 77°14'W39°43'N / 77°12'W1.00 Mile37 Yards0025K0Carroll
32.51980-06-07339°56'N / 77°01'W1.50 Miles400 Yards00250K0Adams
33.11980-06-07240°02'N / 77°01'W40°02'N / 76°57'W3.30 Miles33 Yards002.5M0York
33.31967-09-21240°25'N / 77°11'W0.10 Mile30 Yards00250K0Perry
35.01992-10-09240°07'N / 76°57'W2.00 Miles100 Yards002.5M0York
36.91978-08-28239°48'N / 77°02'W39°45'N / 77°00'W3.30 Miles20 Yards003K0Adams
38.61952-07-23240°37'N / 77°34'W0425K0Mifflin
39.31985-07-31240°10'N / 76°54'W40°09'N / 76°51'W3.00 Miles20 Yards02250K0Lancaster
39.61978-08-28239°45'N / 77°00'W39°43'N / 76°59'W1.90 Miles33 Yards003K0York
39.92001-09-24239°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.
40.91989-11-20240°37'N / 77°49'W40°39'N / 77°47'W3.50 Miles1230 Yards0025K0Huntingdon
41.01990-06-08239°49'N / 76°54'W1.00 Mile60 Yards01250K0York
42.11952-04-05339°48'N / 76°59'W39°57'N / 76°43'W17.50 Miles33 Yards042.5M0York
43.01977-04-05240°15'N / 76°50'W2.00 Miles67 Yards012.5M0Dauphin
44.31991-09-18240°40'N / 77°49'W40°42'N / 77°47'W4.00 Miles330 Yards03250K0Huntingdon
45.52004-09-17239°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.
46.01979-05-23239°35'N / 77°00'W2.00 Miles150 Yards002.5M0Carroll
46.71970-03-26240°16'N / 76°46'W2.50 Miles50 Yards00250K0Dauphin
47.51978-07-31239°24'N / 77°21'W1.50 Miles100 Yards0025K0Frederick
47.71956-06-13239°57'N / 76°43'W0225K0York
48.01969-07-27240°04'N / 76°42'W0.30 Mile100 Yards00250K0York
48.01978-08-28239°43'N / 76°59'W39°34'N / 76°47'W14.80 Miles33 Yards000K0Frederick
48.01996-07-19239°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.
48.51963-03-27240°00'N / 76°51'W40°03'N / 76°32'W17.00 Miles20 Yards0025K0York
48.81980-04-09240°44'N / 77°19'W40°43'N / 77°17'W00250K0Snyder


* 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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