Alert archive / Virginia / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 204, NWS Wakefield, VA

August 14, 2011Fluvanna County, Goochland County, Louisa County, Virginia

NWS Wakefield, VA issued this severe thunderstorm warning at Aug 14, 2011, 7:04 PM EDT for Fluvanna County, Goochland County, Louisa County, Virginia. It was in force for 56 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: Aug 14, 2011, 7:04 PM EDT (23:04 UTC)
Expired: Aug 14, 2011, 8:00 PM EDT
In force: 56 min
Issued by: NWS Wakefield, VA
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

Counties Fluvanna County, VA, Goochland County, VA, Louisa County, VA

The radar

The Norfolk radar (KAKQ), 133 km from the middle of the area, began a volume at 23:05 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 nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 11.1 hours before the alert went out and 135 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: 618 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 493 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 71 m²/s²
0-3 km storm-relative helicity: 156 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.5

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 Wakefield, VA wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 13, 7:36 PM EDT, 23 hours 28 minutes earlier.

Area forecast discussion, Aug 13, 7:36 PM EDT, 23 hours 28 minutes before

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Hazardous weather outlook, Aug 13, 7:32 PM EDT, 23 hours 32 minutes before

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The office that day

Everything else NWS Wakefield, VA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 14, 3:54 AM EDT	Small Craft Advisory	AKQ		20 hr
Aug 14, 5:25 AM EDT	Special Weather Statement	AKQ	Hanover, City of Richmond	35 min
Aug 14, 6:01 AM EDT	Special Weather Statement	AKQ	Goochland, Louisa	29 min
Aug 14, 6:02 AM EDT	Special Weather Statement	AKQ	Essex, Richmond, Westmoreland, City of Richmond	58 min
Aug 14, 6:35 AM EDT	Special Weather Statement	AKQ	Goochland, Louisa	55 min
Aug 14, 7:24 AM EDT	Special Weather Statement	AKQ	Essex, King William	51 min
Aug 14, 7:41 AM EDT	Special Weather Statement	AKQ	Caroline	49 min
Aug 14, 10:07 AM EDT	Special Weather Statement	AKQ	Richmond	53 min
Aug 14, 6:22 PM EDT	Special Weather Statement	AKQ	City of Virginia Beach	53 min
Aug 14, 7:41 PM EDT	Special Weather Statement	AKQ	City of Virginia Beach	49 min
Aug 14, 7:48 PM EDT	Special Weather Statement	AKQ	Fluvanna	42 min
Aug 14, 10:46 AM EDT	Special Weather Statement	AKQ	Somerset	59 min
Aug 14, 5:33 PM EDT	Special Weather Statement	AKQ	Wicomico	42 min
Aug 14, 7:31 PM EDT	Special Weather Statement	AKQ	Worcester	44 min

Nearby

Severe Thunderstorm Warnings in Virginia, 2011 Every severe thunderstorm warning in 2011

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.