Alert archive / West Virginia / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 37, NWS Baltimore/Washington

April 9, 2020Grant County, Hardy County, West Virginia

NWS Baltimore/Washington issued this severe thunderstorm warning at Apr 9, 2020, 2:52 AM EDT for Grant County, Hardy County, West Virginia. It was in force for 38 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Apr 9, 2020, 2:52 AM EDT (06:52 UTC)
Expired: Apr 9, 2020, 3:30 AM EDT
In force: 38 min
Issued by: NWS Baltimore/Washington
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Grant County, WV, Hardy County, WV

The radar

The Sterling radar (KLWX), 133 km from the middle of the area, began a volume at 06:52 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 9, 2:03 AM EDT	Severe Thunderstorm Watch	SPC	3 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 6.9 hours before the alert went out and 141 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 5 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 2113 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 43 m²/s²
0-3 km storm-relative helicity: 79 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Baltimore/Washington wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 9, 2:14 AM EDT, 38 minutes earlier.

Area forecast discussion, Apr 9, 2:14 AM EDT, 38 minutes before

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Hazardous weather outlook, Apr 9, 2:11 AM EDT, 41 minutes before

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In the hours before

Local storm report, Apr 8, 11:06 PM EDT, 3 hours 46 minutes before

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The office that day

Everything else NWS Baltimore/Washington issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 8, 8:13 PM EDT	Wind Advisory	LWX	Albemarle, Amherst, Arlington, Augusta, Clarke, Fairfax and 21 more	23 hr
Apr 9, 2:42 AM EDT	Severe Thunderstorm Warning	LWX	Highland	63 min
Apr 9, 3:14 AM EDT	Severe Thunderstorm Warning	LWX	Augusta, City of Staunton, City of Waynesboro	61 min
Apr 9, 5:33 AM EDT	Special Marine Warning	LWX		51 min
Apr 9, 7:58 AM EDT	Special Marine Warning	LWX		66 min
Apr 9, 11:44 AM EDT	Severe Thunderstorm Warning	LWX	Clarke, Frederick, Loudoun, City of Winchester	46 min
Apr 9, 12:00 PM EDT	Special Marine Warning	LWX		90 min
Apr 9, 12:06 PM EDT	Special Marine Warning	LWX		114 min
Apr 9, 12:43 PM EDT	Special Marine Warning	LWX		52 min
Apr 9, 12:58 PM EDT	Special Marine Warning	LWX		37 min
Apr 9, 7:37 PM EDT	Gale Warning	LWX		26 hr
Apr 9, 7:37 PM EDT	Small Craft Advisory	LWX		46 hr
Apr 9, 7:38 PM EDT	Wind Advisory	LWX	Albemarle, Amherst, Arlington, Augusta, Clarke, Fairfax and 20 more	22 hr
Apr 9, 7:47 PM EDT	Freeze Watch	LWX	Albemarle, Amherst, Augusta, Clarke, Culpeper, Fauquier and 16 more	19 hr
Apr 9, 3:19 AM EDT	Coastal Flood Advisory	LWX	Anne Arundel	9 hr
Apr 9, 11:51 AM EDT	Severe Thunderstorm Warning	LWX	Baltimore, Carroll, Frederick, Howard, Montgomery	39 min
Apr 9, 12:13 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel, Prince George's	47 min
Apr 9, 12:24 PM EDT	Severe Thunderstorm Warning	LWX	Baltimore, Harford, City of Baltimore	66 min
Apr 9, 1:16 PM EDT	Severe Thunderstorm Warning	LWX	Baltimore, Carroll, Harford, City of Baltimore	18 min

Nearby

Severe Thunderstorm Warnings in West Virginia, 2020 Every severe thunderstorm warning 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.