Alert archive / Virginia / Blizzard Warnings in 2010

Blizzard Warning 2, NWS Baltimore/Washington

February 10, 201012 counties in Virginia; 11 counties in Maryland; 7 counties in West Virginia

NWS Baltimore/Washington issued this blizzard warning at Feb 10, 2010, 3:45 AM EST for 12 counties in Virginia; 11 counties in Maryland; 7 counties in West Virginia. It was in force for 23 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 10, 2010, 3:45 AM EST (08:45 UTC)
Expired: Feb 11, 2010, 2:48 AM EST
In force: 23 hr
Issued by: NWS Baltimore/Washington

All 30 counties

Allegany County, MD, Anne Arundel County, MD, Baltimore County, MD, Calvert County, MD, Carroll County, MD, Charles County, MD, City of Baltimore, MD, Frederick County, MD, Prince George's County, MD, Saint Mary's County, MD, Washington County, MD, Arlington County, VA, City of Alexandria, VA, City of Fairfax, VA, City of Falls Church, VA, City of Winchester, VA, Clarke County, VA, Fairfax County, VA, Fauquier County, VA, Frederick County, VA, King George 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), 13 km from the middle of the area, began a volume at 08:49 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

Wallops Is Stn, VA (KWAL), launched 00:00Z, 8.8 hours before the alert went out and 229 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: 1676 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 146 m²/s²
0-3 km storm-relative helicity: 305 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 blizzard 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 blizzard warning went out at Feb 9, 3:16 PM EST, 12 hours 29 minutes earlier.

Area forecast discussion, Feb 9, 3:16 PM EST, 12 hours 29 minutes before

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Hazardous weather outlook, Feb 9, 3:31 PM EST, 12 hours 14 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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The office that day

Everything else NWS Baltimore/Washington issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 10, 11:04 AM EST	Wind Advisory	LWX	Culpeper, Greene, Madison, Nelson, Orange, Page and 9 more	8 hr
Feb 10, 11:57 AM EST	Storm Warning	LWX		9 hr

Nearby

Blizzard Warnings in Virginia, 2010 Blizzard Warnings in Maryland, 2010 Blizzard Warnings in West Virginia, 2010 Every blizzard 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.