Alert archive / West Virginia / Severe Thunderstorm Watches in 2020
Severe Thunderstorm Watch 86
The Storm Prediction Center issued this severe thunderstorm watch at Apr 8, 2020, 2:14 AM EDT for 4 states. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 8, 2020, 2:14 AM EDT (06:14 UTC)
- Expired
- Apr 8, 2020, 4:36 AM EDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
Counties Allegany County, MD, Washington County, MD, Bedford County, PA, Franklin County, PA, Fulton County, PA, City of Winchester, VA, Frederick County, VA, Berkeley County, WV, Grant County, WV, Hampshire County, WV, Hardy County, WV, Jefferson County, WV, Mineral County, WV, Morgan County, WV
The radar
The Sterling radar (KLWX), 112 km from the middle of the area, began a volume at 06:14 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 5%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 50%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
5 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 8, 2:26 AM EDT | Severe Thunderstorm Warning | CTP | Bedford, Fulton, Huntingdon | 49 min |
| Apr 8, 2:29 AM EDT | Severe Thunderstorm Warning | LWX | Allegany | 61 min |
| Apr 8, 2:50 AM EDT | Severe Thunderstorm Warning | LWX | Allegany, Washington | 55 min |
| Apr 8, 2:51 AM EDT | Severe Thunderstorm Warning | CTP | Franklin | 39 min |
| Apr 8, 3:43 AM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick, Montgomery, Washington | 47 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 00:00Z, 6.2 hours before the alert went out and 120 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 14 J/kg
- Mixed-layer CIN
- -214 J/kg
- Mixed-layer LCL
- 1167 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 76 m²/s²
- 0-3 km storm-relative helicity
- 118 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 7, 11:40 PM EDT | Severe Thunderstorm Watch | SPC | Garrett | 6 hr |
| Apr 8, 1:52 AM EDT | Mesoscale Discussion | SPC | Allegany, Garrett | 83 min |
| Apr 8, 3:53 AM EDT | Mesoscale Discussion | SPC | Carroll, Frederick, Howard, Montgomery, Prince George's, City of Baltimore | 97 min |
| Apr 7, 9:07 PM EDT | Severe Thunderstorm Watch | SPC | Crawford, Erie | 6 hr |
| Apr 7, 10:04 PM EDT | Mesoscale Discussion | SPC | Beaver, Crawford, Lawrence, Mercer, Venango | 86 min |
| Apr 7, 10:54 PM EDT | Mesoscale Discussion | SPC | Armstrong, Blair, Butler, Cambria, Cameron, Centre and 19 more | 2 hr |
| Apr 8, 5:30 AM EDT | Mesoscale Discussion | SPC | Bath, Highland | 30 min |
| Apr 8, 12:39 PM EDT | Mesoscale Discussion | SPC | Bland, Buchanan, Craig, Giles, Montgomery, Pulaski and 3 more | 96 min |
| Apr 8, 1:10 PM EDT | Severe Thunderstorm Watch | SPC | Bland, Buchanan, Carroll, Craig, Dickenson, Floyd and 19 more | 7 hr |
| Apr 8, 4:05 PM EDT | Mesoscale Discussion | SPC | Bedford, Bland, Buchanan, Carroll, Craig, Dickenson and 20 more | 85 min |
| Apr 8, 6:06 PM EDT | Mesoscale Discussion | SPC | City of Danville | 84 min |
| Apr 8, 3:16 AM EDT | Mesoscale Discussion | SPC | Barbour, Braxton, Calhoun, Doddridge, Gilmer, Harrison and 13 more | 89 min |
Nearby
Severe Thunderstorm Watches in West Virginia, 2020Severe Thunderstorm Watches in Pennsylvania, 2020Severe Thunderstorm Watches in Maryland, 2020Every severe thunderstorm watch in 2020
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.