Alert archive / Virginia / Red Flag Warnings in 2010

Red Flag Warning 2, NWS Baltimore/Washington

April 7, 201010 counties in Virginia; 4 counties in Maryland; 7 counties in West Virginia

NWS Baltimore/Washington issued this red flag warning at Apr 7, 2010, 9:57 AM EDT for 10 counties in Virginia; 4 counties in Maryland; 7 counties in West Virginia. It took effect at Apr 7, 2010, 12:00 PM EDT. It was in force for 7 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Apr 7, 2010, 9:57 AM EDT (13:57 UTC)
In effect from: Apr 7, 2010, 12:00 PM EDT
Expired: Apr 7, 2010, 7:00 PM EDT
In force: 7 hr
Issued by: NWS Baltimore/Washington

All 21 counties

Allegany County, MD, Carroll County, MD, Frederick County, MD, Washington County, MD, Augusta County, VA, City of Harrisonburg, VA, City of Staunton, VA, City of Winchester, VA, Clarke County, VA, Frederick County, VA, Page County, VA, Rockingham County, VA, Shenandoah County, VA, Warren County, VA, Berkeley County, WV, Grant County, WV, Hampshire County, WV, Hardy County, WV, Jefferson County, WV, Mineral County, WV, Morgan County, WV

The radar

The Sterling radar (KLWX), 79 km from the middle of the area, began a volume at 13:55 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

Pittsburgh, PA (KPIT), launched 12:00Z, 2.0 hours before the alert went out and 208 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: 2459 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 207 m²/s²
0-3 km storm-relative helicity: 254 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 red flag 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 red flag warning went out at Apr 7, 4:17 AM EDT, 5 hours 40 minutes earlier.

Area forecast discussion, Apr 7, 4:17 AM EDT, 5 hours 40 minutes before

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Hazardous weather outlook, Apr 7, 6:07 AM EDT, 3 hours 50 minutes before

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In the hours before

Special weather statement, Apr 7, 5:14 AM EDT, 4 hours 43 minutes before

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Special weather statement, Apr 7, 9:52 AM EDT, 5 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
Apr 6, 11:15 PM EDT	Small Craft Advisory	LWX		7 hr
Apr 7, 3:47 AM EDT	Small Craft Advisory	LWX		3 days

Nearby

Red Flag Warnings in Virginia, 2010 Red Flag Warnings in West Virginia, 2010 Red Flag Warnings in Maryland, 2010 Every red flag 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.