Alert archive / Virginia / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 77, NWS Wakefield, VA

May 9, 20096 counties in Virginia

NWS Wakefield, VA issued this severe thunderstorm warning at May 9, 2009, 2:14 AM EDT for 6 counties in Virginia. It was in force for 46 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
May 9, 2009, 2:14 AM EDT (06:14 UTC)
Expired
May 9, 2009, 3:00 AM EDT
In force
46 min
Issued by
NWS Wakefield, VA
Area
Storm-based polygon

Counties Dinwiddie County, VA, Greensville County, VA, Prince George County, VA, Southampton County, VA, Surry County, VA, Sussex County, VA

The radar

The Norfolk radar (KAKQ), 24 km from the middle of the area, began a volume at 06:15 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.

IssuedProductOfficeLasted
May 9, 1:07 AM EDTTornado WatchSPC4 hr

The nearest sounding before it

Roanoke, VA (KRNK), launched 00:00Z, 6.2 hours before the alert went out and 199 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-pSkew-T log-p diagram, Roanoke, VA at 00:00Z on 2009-05-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 113 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Roanoke, VA at 00:00Z on 2009-05-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 84 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
113 J/kg
Mixed-layer CIN
-42 J/kg
Mixed-layer LCL
1561 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
84 m²/s²
0-3 km storm-relative helicity
103 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.8

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 May 9, 1:20 AM EDT, 54 minutes earlier.

Area forecast discussion, May 9, 1:20 AM EDT, 54 minutes before
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Hazardous weather outlook, May 8, 9:57 PM EDT, 4 hours 17 minutes before
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In the hours before

Special weather statement, May 9, 12:41 AM EDT, 1 hour 33 minutes before
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Special weather statement, May 9, 1:15 AM EDT, 59 minutes before
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Special weather statement, May 9, 1:59 AM EDT, 15 minutes before
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      <h1 id="headline">This service is currently unavailable.</h1>
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The office that day

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

IssuedProductOfficeCountiesLasted
May 9, 1:44 AM EDTSevere Thunderstorm WarningAKQBrunswick, Dinwiddie, Lunenburg, Nottoway, Sussex46 min
May 9, 3:11 AM EDTSevere Thunderstorm WarningAKQCity of Chesapeake, City of Hampton, City of Newport News, City of Norfolk, City of Portsmouth, City of Suffolk and 1 more19 min
May 9, 3:15 AM EDTSpecial Marine WarningAKQ60 min
May 9, 3:29 AM EDTSevere Thunderstorm WarningAKQCity of Chesapeake, City of Norfolk, City of Virginia Beach46 min
May 9, 4:22 AM EDTSpecial Marine WarningAKQ38 min
May 9, 6:04 PM EDTSevere Thunderstorm WarningAKQCharles City, Prince George, Surry41 min
May 9, 6:37 PM EDTSevere Thunderstorm WarningAKQIsle of Wight, James City, Surry, York, City of Newport News, City of Williamsburg38 min
May 9, 6:41 PM EDTSevere Thunderstorm WarningAKQAmelia, Lunenburg, Nottoway, Prince Edward49 min
May 9, 7:14 PM EDTSpecial Marine WarningAKQ34 min
May 9, 7:16 PM EDTSevere Thunderstorm WarningAKQYork, City of Hampton, City of Newport News, City of Poquoson29 min
May 9, 7:20 PM EDTSpecial Marine WarningAKQ88 min
May 9, 7:31 PM EDTSevere Thunderstorm WarningAKQAmelia, Charles City, Chesterfield, Dinwiddie, Hanover, Henrico and 9 more44 min
May 9, 7:52 PM EDTSevere Thunderstorm WarningAKQGreensville, Southampton, Sussex, City of Emporia38 min
May 9, 7:53 PM EDTSpecial Marine WarningAKQ2 hr
May 9, 6:41 PM EDTSevere Thunderstorm WarningAKQDorchester, Wicomico49 min
May 9, 7:20 PM EDTSevere Thunderstorm WarningAKQWicomico, Worcester55 min

Nearby

Severe Thunderstorm Warnings in Virginia, 2009Every severe thunderstorm warning in 2009

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.