Alert archive / Virginia / Red Flag Warnings in 2013

Red Flag Warning 1, NWS Baltimore/Washington

April 3, 201314 counties in Virginia; 8 counties in Maryland; 7 counties in West Virginia

NWS Baltimore/Washington issued this red flag warning at Apr 3, 2013, 4:30 AM EDT for 14 counties in Virginia; 8 counties in Maryland; 7 counties in West Virginia. It took effect at Apr 3, 2013, 12:00 PM EDT. It was in force for 8 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 3, 2013, 4:30 AM EDT (08:30 UTC)
In effect from: Apr 3, 2013, 12:00 PM EDT
Expired: Apr 3, 2013, 8:00 PM EDT
In force: 8 hr
Issued by: NWS Baltimore/Washington

All 29 counties

Allegany County, MD, Anne Arundel County, MD, Baltimore County, MD, Carroll County, MD, City of Baltimore, MD, Frederick County, MD, Prince George's County, MD, Washington County, MD, Arlington County, VA, City of Alexandria, VA, City of Falls Church, VA, City of Winchester, VA, Clarke County, VA, Culpeper County, VA, Fairfax County, VA, Fauquier County, VA, Frederick County, VA, Madison County, VA, Page County, VA, Rappahannock 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), 34 km from the middle of the area, began a volume at 08:31 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

Washington/Dulle, VA (KIAD), launched 00:00Z, 8.5 hours before the alert went out and 42 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: 3136 m above ground
0-6 km bulk shear: 88 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 80 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 3, 3:59 AM EDT, 31 minutes earlier.

Area forecast discussion, Apr 3, 3:59 AM EDT, 31 minutes before

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Hazardous weather outlook, Apr 2, 9:47 PM EDT, 6 hours 43 minutes before

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Nearby

Red Flag Warnings in Virginia, 2013 Red Flag Warnings in Maryland, 2013 Red Flag Warnings in West Virginia, 2013 Every red flag warning in 2013

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.