Alert archive / Virginia / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 55, NWS Blacksburg, VA

May 14, 2010Charlotte County, Halifax County, Pittsylvania County, Virginia

NWS Blacksburg, VA issued this severe thunderstorm warning at May 14, 2010, 10:20 PM EDT for Charlotte County, Halifax County, Pittsylvania County, Virginia. It was in force for 55 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 14, 2010, 10:20 PM EDT (02:20 UTC)
Expired: May 14, 2010, 11:15 PM EDT
In force: 55 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon

Counties Charlotte County, VA, Halifax County, VA, Pittsylvania County, VA

The radar

The Roanoke radar (KFCX), 115 km from the middle of the area, began a volume at 02:20 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

Roanoke, VA (KRNK), launched 00:00Z, 2.3 hours before the alert went out and 58 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: 6 J/kg
Mixed-layer CIN: -129 J/kg
Mixed-layer LCL: 2037 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: -23 m²/s²
0-3 km storm-relative helicity: 7 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 Blacksburg, VA wrote its last area forecast discussion before this severe thunderstorm warning went out at May 14, 7:48 PM EDT, 2 hours 32 minutes earlier.

Area forecast discussion, May 14, 7:48 PM EDT, 2 hours 32 minutes before

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Hazardous weather outlook, May 14, 10:05 PM EDT, 15 minutes before

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In the hours before

Local storm report, May 14, 9:19 PM EDT, 1 hour 1 minute before

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Local storm report, May 14, 9:28 PM EDT, 52 minutes before

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Local storm report, May 14, 9:46 PM EDT, 34 minutes before

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Local storm report, May 14, 9:48 PM EDT, 32 minutes before

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Local storm report, May 14, 9:59 PM EDT, 21 minutes before

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Special weather statement, May 14, 10:00 PM EDT, 20 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 14, 8:11 PM EDT	Special Weather Statement	RNK	Buckingham	49 min
May 14, 8:19 PM EDT	Special Weather Statement	RNK	Alleghany, Bath, City of Covington	26 min
May 14, 8:21 PM EDT	Severe Thunderstorm Warning	RNK	Buckingham	39 min
May 14, 8:23 PM EDT	Severe Thunderstorm Warning	RNK	Amherst	23 min
May 14, 8:35 PM EDT	Severe Thunderstorm Warning	RNK	Floyd, Franklin	38 min
May 14, 8:42 PM EDT	Severe Thunderstorm Warning	RNK	Floyd, Franklin, Patrick	31 min
May 14, 9:16 PM EDT	Special Weather Statement	RNK	Cumberland	14 min
May 14, 9:41 PM EDT	Severe Thunderstorm Warning	RNK	Franklin, Henry, Patrick, Pittsylvania	41 min
May 14, 10:00 PM EDT	Special Weather Statement	RNK	Henry, City of Martinsville	60 min
May 14, 10:33 PM EDT	Special Weather Statement	RNK	Halifax	42 min
May 15, 7:12 PM EDT	Special Weather Statement	RNK	Carroll, Floyd, Franklin, Grayson, City of Galax	63 min
May 15, 7:24 PM EDT	Severe Thunderstorm Warning	RNK	Carroll, Floyd, Patrick	66 min
May 15, 7:36 PM EDT	Severe Thunderstorm Warning	RNK	Carroll, Grayson, City of Galax	42 min
May 15, 7:49 PM EDT	Severe Thunderstorm Warning	RNK	Franklin, Henry, Patrick	56 min
May 14, 8:38 PM EDT	Special Weather Statement	RNK	Ashe, Watauga	37 min
May 14, 9:12 PM EDT	Special Weather Statement	RNK	Surry	33 min
May 14, 11:05 PM EDT	Special Weather Statement	RNK	Caswell	40 min
May 15, 6:08 PM EDT	Special Weather Statement	RNK	Watauga	37 min
May 15, 6:23 PM EDT	Severe Thunderstorm Warning	RNK	Surry, Wilkes	72 min

Nearby

Severe Thunderstorm Warnings in Virginia, 2010 Every severe thunderstorm warning in 2010

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.