USA.com / Virginia / Alleghany County / Natural Disasters and Weather Extremes

Alleghany County Natural Disasters and Weather Extremes

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

Topics:Earthquake Index Volcano Index Tornado Index Other Weather Extremes Events Volcanos Nearby Historical Earthquake Events Historical Tornado Events

Earthquake Index, #69

Alleghany County	0.08
Virginia	0.20
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

Alleghany County	0.0000
Virginia	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, #119

Alleghany County	19.27
Virginia	88.66
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 10,451 other weather extremes events within 50 miles of Alleghany County were recorded from 1950 to 2010. The following is a break down of these events:

Type	Count	Type	Count	Type	Count	Type	Count	Type	Count
Avalanche:	0	Blizzard:	4	Cold:	106	Dense Fog:	9	Drought:	104
Dust Storm:	0	Flood:	1,713	Hail:	2,706	Heat:	60	Heavy Snow:	329
High Surf:	0	Hurricane:	0	Ice Storm:	57	Landslide:	1	Strong Wind:	244
Thunderstorm Winds:	4,315	Tropical Storm:	3	Wildfire:	31	Winter Storm:	132	Winter Weather:	159
Other:	478

Volcanos Nearby

No volcano is found in or near Alleghany County.

Historical Earthquake Events

A total of 1 historical earthquake event that had a recorded magnitude of 3.5 or above found in or near Alleghany County.

Distance (miles)	Date	Magnitude	Depth (km)	Latitude	Longitude
36.1	1974-05-30	3.6	8	37.38	-80.42

Historical Tornado Events

A total of 13 historical tornado events that had recorded magnitude of 2 or above found in or near Alleghany County.

Distance (miles)	Date	Magnitude	Start Lat/Log	End Lat/Log	Length	Width	Fatalities	Injuries	Property Damage	Crop Damage	Affected County
25.0	1975-04-24	2	37°47'N / 80°28'W		6.00 Miles	67 Yards	0	0	25K	0	Greenbrier
27.2	1990-06-22	2	37°41'N / 80°30'W	37°42'N / 80°29'W	1.00 Mile	150 Yards	0	0	250K	0	Greenbrier
27.4	1990-06-22	2	37°38'N / 80°28'W	37°41'N / 80°30'W	4.00 Miles	150 Yards	0	0	250K	0	Monroe
32.6	1976-07-11	2	37°36'N / 80°34'W	37°33'N / 80°31'W	4.10 Miles	33 Yards	0	0	250K	0	Monroe
33.2	1974-04-04	2	37°18'N / 80°02'W	37°19'N / 79°55'W	6.50 Miles	177 Yards	0	0	2.5M	0	Roanoke
36.0	1974-04-04	3	37°54'N / 80°47'W	38°01'N / 80°29'W	18.10 Miles	33 Yards	0	3	2.5M	0	Greenbrier
38.2	2004-09-17	2	37°15'N / 79°47'W	37°17'N / 79°46'W	3.00 Miles	300 Yards	0	0	0	0	Bedford
		Brief Description: At 1212 EST, an F0 tornado touched down near Dickerson Road, and the width was less than 50 yards. The tornado damage path widened and varied from 100 yards to as much as 300 yards, as it did moderate to strong F1 damage to trees. A few homes suffered only minor damage to shingles and roofs, mainly due to trees falling on them. As the F1 tornado crossed Highway 24 at 1215 EST, it continued to damage trees, and was about 75 yards wide. A poorly constructed building was demolished. As the tornado moved north, it continued to down trees. Also, a car was pivoted in a driveway but undamaged. Minor structural and roof damage to homes occurred, as the tornado increased to a weak F2. The tornado weakened to F0 by 1217 EST, downing more trees along County Road 619.
39.0	1996-07-15	2	37°21'N / 79°34'W	37°21'N / 79°33'W	0.50 Mile	30 Yards	0	0	140K	0	Bedford
40.6	1953-05-17	2	37°12'N / 80°00'W		1.00 Mile	880 Yards	0	0	25K	0	Roanoke
42.6	1990-05-04	2	38°06'N / 79°20'W		7.00 Miles	27 Yards	2	10	2.5M	0	Augusta
45.2	1996-06-09	2	37°10'N / 79°45'W	37°10'N / 79°45'W	0.10 Mile	30 Yards	0	0	0	0	Franklin
47.6	1974-04-04	3	37°50'N / 80°58'W	37°54'N / 80°47'W	10.80 Miles	33 Yards	1	8	2.5M	0	Fayette
48.4	1965-04-08	2	37°30'N / 80°49'W		0.50 Mile	100 Yards	0	0	25K	0	Summers

* 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.