Alert archive / Virginia / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 270, NWS Baltimore/Washington

August 24, 2007Albemarle County, City of Charlottesville, Virginia

NWS Baltimore/Washington issued this severe thunderstorm warning at Aug 24, 2007, 4:52 PM EDT for Albemarle County, City of Charlottesville, Virginia. It was in force for 53 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 24, 2007, 4:52 PM EDT (20:52 UTC)
Expired: Aug 24, 2007, 5:45 PM EDT
In force: 53 min
Issued by: NWS Baltimore/Washington
Area: Counties, with a storm outline in the text

Counties Albemarle County, VA, City of Charlottesville, VA

The radar

The Sterling radar (KLWX), 138 km from the middle of the area, began a volume at 20:54 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 12:00Z, 8.9 hours before the alert went out and 126 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: 1647 J/kg
Mixed-layer CIN: -71 J/kg
Mixed-layer LCL: 732 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: 19 m²/s²
0-3 km storm-relative helicity: 8 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 Aug 24, 3:24 PM EDT, 1 hour 28 minutes earlier.

Area forecast discussion, Aug 24, 3:24 PM EDT, 1 hour 28 minutes before

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Hazardous weather outlook, Aug 24, 3:25 PM EDT, 1 hour 27 minutes before

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In the hours before

Special weather statement, Aug 24, 1:45 PM EDT, 3 hours 7 minutes before

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Special weather statement, Aug 24, 2:19 PM EDT, 2 hours 33 minutes before

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Special weather statement, Aug 24, 3:38 PM EDT, 1 hour 14 minutes before

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Local storm report, Aug 24, 3:57 PM EDT, 55 minutes before

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Special weather statement, Aug 24, 4:32 PM EDT, 20 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
Aug 24, 4:11 AM EDT	Excessive Heat Watch	LWX	Arlington, City of Alexandria, City of Falls Church	11 hr
Aug 24, 2:31 PM EDT	Severe Thunderstorm Warning	LWX	Rockingham, City of Harrisonburg	59 min
Aug 24, 3:24 PM EDT	Heat Advisory	LWX	Arlington, Clarke, Culpeper, Fairfax, Frederick, Greene and 20 more	27 hr
Aug 24, 4:07 PM EDT	Severe Thunderstorm Warning	LWX	Augusta, City of Staunton	38 min
Aug 24, 1:34 PM EDT	Severe Thunderstorm Warning	LWX	Pendleton	41 min

Nearby

Severe Thunderstorm Warnings in Virginia, 2007 Every severe thunderstorm warning in 2007

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.