Alert archive / Virginia / Winter Storm Warnings in 2007

Winter Storm Warning 2, NWS Baltimore/Washington

February 12, 200726 counties in Virginia; 9 counties in Maryland; 7 counties in West Virginia

NWS Baltimore/Washington issued this winter storm warning at Feb 12, 2007, 3:43 PM EST for 26 counties in Virginia; 9 counties in Maryland; 7 counties in West Virginia. It took effect at Feb 12, 2007, 9:07 PM EST. It was in force for 40 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: Feb 12, 2007, 3:43 PM EST (20:43 UTC)
In effect from: Feb 12, 2007, 9:07 PM EST
Expired: Feb 14, 2007, 1:00 PM EST
In force: 40 hr
Issued by: NWS Baltimore/Washington

All 42 counties

Allegany County, MD, Anne Arundel County, MD, Baltimore County, MD, Carroll County, MD, Charles 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 Charlottesville, VA, City of Fairfax, VA, City of Falls Church, VA, City of Fredericksburg, VA, City of Harrisonburg, VA, City of Staunton, VA, City of Waynesboro, VA, City of Winchester, VA, Clarke County, VA, Culpeper County, VA, Fairfax County, VA, Frederick County, VA, Greene County, VA, King George County, VA, Madison County, VA, Nelson County, VA, Orange County, VA, Page County, VA, Rappahannock County, VA, Rockingham County, VA, Shenandoah County, VA, Spotsylvania County, VA, Stafford 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), 43 km from the middle of the area, began a volume at 20:43 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 12:00Z, 8.7 hours before the alert went out and 49 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: 1407 m above ground
0-6 km bulk shear: 69 kt
0-1 km storm-relative helicity: -11 m²/s²
0-3 km storm-relative helicity: 88 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 winter storm 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 winter storm warning went out at Feb 12, 3:14 PM EST, 29 minutes earlier.

Area forecast discussion, Feb 12, 3:14 PM EST, 29 minutes before

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Hazardous weather outlook, Feb 12, 11:26 AM EST, 4 hours 17 minutes before

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Nearby

Winter Storm Warnings in Virginia, 2007 Winter Storm Warnings in Maryland, 2007 Winter Storm Warnings in West Virginia, 2007 Every winter storm warning in 2007

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.