Alert archive / Virginia / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 22, NWS Baltimore/Washington

March 20, 2008Prince William County, Stafford County, City of Manassas, Virginia

NWS Baltimore/Washington issued this severe thunderstorm warning at Mar 20, 2008, 12:10 AM EDT for Prince William County, Stafford County, City of Manassas, Virginia. It was in force for 65 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: Mar 20, 2008, 12:10 AM EDT (04:10 UTC)
Expired: Mar 20, 2008, 1:15 AM EDT
In force: 65 min
Issued by: NWS Baltimore/Washington
Area: Storm-based polygon

Counties City of Manassas, VA, Prince William County, VA, Stafford County, VA

The radar

The Sterling radar (KLWX), 39 km from the middle of the area, began a volume at 04:13 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Mar 20, 12:01 AM EDT	Severe Thunderstorm Watch	SPC	3 hr

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 00:00Z, 4.2 hours before the alert went out and 197 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1135 m above ground
0-6 km bulk shear: 79 kt
0-1 km storm-relative helicity: 354 m²/s²
0-3 km storm-relative helicity: 389 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 Mar 19, 8:50 PM EDT, 3 hours 20 minutes earlier.

Area forecast discussion, Mar 19, 8:50 PM EDT, 3 hours 20 minutes before

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Hazardous weather outlook, Mar 19, 9:10 PM EDT, 3 hours before

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In the hours before

Special weather statement, Mar 19, 9:04 PM EDT, 3 hours 6 minutes before

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Special weather statement, Mar 19, 9:33 PM EDT, 2 hours 37 minutes before

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Special weather statement, Mar 19, 10:21 PM EDT, 1 hour 49 minutes before

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Special weather statement, Mar 19, 10:51 PM EDT, 1 hour 19 minutes before

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Special weather statement, Mar 19, 11:16 PM EDT, 54 minutes before

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Special weather statement, Mar 20, 12:10 AM EDT, 0 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
Mar 19, 8:46 PM EDT	Wind Advisory	LWX	Arlington, Clarke, Culpeper, Fairfax, Frederick, Greene and 20 more	19 hr
Mar 19, 11:20 PM EDT	Severe Thunderstorm Warning	LWX	Culpeper, Greene, Madison, Orange	55 min
Mar 19, 11:44 PM EDT	Severe Thunderstorm Warning	LWX	Fauquier	50 min
Mar 19, 11:56 PM EDT	Special Marine Warning	LWX		113 min
Mar 20, 12:13 AM EDT	Severe Thunderstorm Warning	LWX	Orange, Spotsylvania, City of Fredericksburg	62 min
Mar 20, 2:27 AM EDT	Special Marine Warning	LWX		37 min

Nearby

Severe Thunderstorm Warnings in Virginia, 2008 Every severe thunderstorm warning in 2008

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.