Alert archive / Virginia / Red Flag Warnings in 2014

Red Flag Warning 1, NWS Baltimore/Washington

March 13, 201416 counties in Virginia

NWS Baltimore/Washington issued this red flag warning at Mar 13, 2014, 4:24 AM EDT for 16 counties in Virginia. It took effect at Mar 13, 2014, 9:00 AM EDT. It was in force for 9 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: Mar 13, 2014, 4:24 AM EDT (08:24 UTC)
In effect from: Mar 13, 2014, 9:00 AM EDT
Expired: Mar 13, 2014, 6:00 PM EDT
In force: 9 hr
Issued by: NWS Baltimore/Washington

Counties Albemarle County, VA, Arlington County, VA, City of Alexandria, VA, City of Falls Church, VA, City of Fredericksburg, VA, Culpeper County, VA, Fairfax County, VA, Fauquier County, VA, Greene County, VA, King George County, VA, Madison County, VA, Nelson County, VA, Orange County, VA, Rappahannock County, VA, Spotsylvania County, VA, Stafford County, VA

The radar

The Sterling radar (KLWX), 63 km from the middle of the area, began a volume at 08:21 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, 8.4 hours before the alert went out and 206 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: 865 m above ground
0-6 km bulk shear: 86 kt
0-1 km storm-relative helicity: -172 m²/s²
0-3 km storm-relative helicity: -141 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 Mar 13, 3:54 AM EDT, 30 minutes earlier.

Area forecast discussion, Mar 13, 3:54 AM EDT, 30 minutes before

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Hazardous weather outlook, Mar 12, 10:40 PM EDT, 5 hours 44 minutes before

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In the hours before

Local storm report, Mar 13, 1:25 AM EDT, 2 hours 59 minutes before

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Local storm report, Mar 13, 2:14 AM EDT, 2 hours 10 minutes before

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Local storm report, Mar 13, 2:15 AM EDT, 2 hours 9 minutes before

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Local storm report, Mar 13, 2:20 AM EDT, 2 hours 4 minutes before

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Local storm report, Mar 13, 4:16 AM EDT, 8 minutes before

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Local storm report, Mar 13, 4:24 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 13, 4:38 AM EDT	Small Craft Advisory	LWX		64 hr
Mar 13, 2:13 PM EDT	Fire Weather Watch	LWX	Albemarle, Arlington, Augusta, Clarke, Culpeper, Fairfax and 21 more	18 hr

Nearby

Red Flag Warnings in Virginia, 2014 Every red flag warning in 2014

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.