Alert archive / Virginia / High Wind Watches in 2011

High Wind Watch 1, NWS Baltimore/Washington

February 18, 201123 counties in Virginia; 8 counties in Maryland; 8 counties in West Virginia

NWS Baltimore/Washington issued this high wind watch at Feb 18, 2011, 10:30 AM EST for 23 counties in Virginia; 8 counties in Maryland; 8 counties in West Virginia. It took effect at Feb 19, 2011, 5:00 AM EST. It was in force for .

The area

The counties it named.

The facts

Issued: Feb 18, 2011, 10:30 AM EST (15:30 UTC)
In effect from: Feb 19, 2011, 5:00 AM EST
Expired: Feb 18, 2011, 5:22 PM EST
In force
Issued by: NWS Baltimore/Washington

All 39 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 Charlottesville, VA, City of Fairfax, VA, City of Falls Church, 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, Fauquier County, VA, Frederick County, VA, Greene County, VA, Highland County, VA, Madison County, VA, Nelson County, VA, Page County, VA, Rappahannock 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, Pendleton County, WV

The radar

The Sterling radar (KLWX), 53 km from the middle of the area, began a volume at 15:30 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, 3.5 hours before the alert went out and 60 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: 1427 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 151 m²/s²
0-3 km storm-relative helicity: 162 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 high wind watch 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 high wind watch went out at Feb 18, 3:52 AM EST, 6 hours 38 minutes earlier.

Area forecast discussion, Feb 18, 3:52 AM EST, 6 hours 38 minutes before

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Hazardous weather outlook, Feb 18, 5:04 AM EST, 5 hours 26 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
Feb 18, 3:12 AM EST	Gale Warning	LWX		33 hr
Feb 18, 3:12 AM EST	Small Craft Advisory	LWX		18 hr
Feb 18, 3:16 AM EST	Fire Weather Watch	LWX	Albemarle, Arlington, Augusta, Clarke, Culpeper, Fairfax and 21 more	11 hr
Feb 18, 2:03 PM EST	Red Flag Warning	LWX	Albemarle, Arlington, Augusta, Clarke, Culpeper, Fairfax and 21 more	31 hr
Feb 18, 5:22 PM EST	Gale Warning	LWX		35 hr
Feb 18, 5:22 PM EST	High Wind Warning	LWX	Arlington, Clarke, Culpeper, Fairfax, Fauquier, Frederick and 22 more	26 hr
Feb 18, 5:22 PM EST	Storm Warning	LWX		26 hr
Feb 18, 5:22 PM EST	Wind Advisory	LWX	Arlington, Clarke, Fairfax, Fauquier, Frederick, King George and 10 more	19 hr

Nearby

High Wind Watches in Virginia, 2011 High Wind Watches in Maryland, 2011 High Wind Watches in West Virginia, 2011 Every high wind watch in 2011

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.