Alert archive / Virginia / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 319, NWS Baltimore/Washington

July 22, 2011Augusta County, Rockingham County, Virginia

NWS Baltimore/Washington issued this severe thunderstorm warning at Jul 22, 2011, 8:12 PM EDT for Augusta County, Rockingham County, Virginia. It was in force for 24 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: Jul 22, 2011, 8:12 PM EDT (00:12 UTC)
Expired: Jul 22, 2011, 8:36 PM EDT
In force: 24 min
Issued by: NWS Baltimore/Washington
Area: Storm-based polygon

Counties Augusta County, VA, Rockingham County, VA

The radar

The Sterling radar (KLWX), 150 km from the middle of the area, began a volume at 00:13 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, 0.2 hours before the alert went out and 134 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: 943 J/kg
Mixed-layer CIN: -105 J/kg
Mixed-layer LCL: 1248 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 53 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 Jul 22, 8:00 PM EDT, 12 minutes earlier.

Area forecast discussion, Jul 22, 8:00 PM EDT, 12 minutes before

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Hazardous weather outlook, Jul 22, 7:52 PM EDT, 20 minutes before

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In the hours before

Special weather statement, Jul 22, 6:43 PM EDT, 1 hour 29 minutes before

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Special weather statement, Jul 22, 6:58 PM EDT, 1 hour 14 minutes before

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Special weather statement, Jul 22, 7:12 PM EDT, 1 hour before

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Special weather statement, Jul 22, 7:35 PM EDT, 37 minutes before

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Special weather statement, Jul 22, 7:45 PM EDT, 27 minutes before

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Special weather statement, Jul 22, 7:59 PM EDT, 13 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
Jul 22, 8:32 PM EDT	Special Weather Statement	LWX	Buckingham	18 min
Jul 23, 1:50 PM EDT	Special Weather Statement	LWX	Nelson	25 min
Jul 23, 2:26 PM EDT	Special Weather Statement	LWX	City of Charlottesville	34 min
Jul 23, 2:43 PM EDT	Severe Thunderstorm Warning	LWX	Albemarle, City of Charlottesville	47 min
Jul 23, 2:52 PM EDT	Severe Thunderstorm Warning	LWX	Albemarle	38 min
Jul 23, 2:56 PM EDT	Severe Thunderstorm Warning	LWX	Culpeper, Orange	49 min
Jul 23, 3:07 PM EDT	Flash Flood Warning	LWX	Albemarle	94 min
Jul 23, 3:23 PM EDT	Special Weather Statement	LWX	Frederick	37 min
Jul 23, 3:29 PM EDT	Heat Advisory	LWX	Arlington, Culpeper, Fairfax, Fauquier, King George, Madison and 8 more	29 hr
Jul 23, 7:08 PM EDT	Special Marine Warning	LWX		37 min
Jul 23, 7:13 PM EDT	Special Marine Warning	LWX		32 min
Jul 23, 7:35 PM EDT	Special Weather Statement	LWX	City of Waynesboro	25 min
Jul 23, 7:39 PM EDT	Severe Thunderstorm Warning	LWX	Albemarle, Augusta, Nelson, City of Waynesboro	51 min
Jul 22, 8:16 PM EDT	Special Weather Statement	LWX	Allegany	29 min
Jul 22, 9:06 PM EDT	Special Weather Statement	LWX	Allegany	24 min
Jul 23, 7:54 AM EDT	Special Weather Statement	LWX	Baltimore	36 min
Jul 23, 7:09 PM EDT	Severe Thunderstorm Warning	LWX	Charles, Prince George's	36 min
Jul 23, 7:50 PM EDT	Special Weather Statement	LWX	Prince George's	25 min
Jul 23, 2:38 PM EDT	Special Weather Statement	LWX	Morgan	37 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.