Alert archive / Virginia / Wind Advisories in 2008

Wind Advisory 15, NWS Baltimore/Washington

December 21, 200813 counties in Virginia; 11 counties in Maryland; 7 counties in West Virginia

NWS Baltimore/Washington issued this wind advisory at Dec 21, 2008, 3:21 PM EST for 13 counties in Virginia; 11 counties in Maryland; 7 counties in West Virginia. It took effect at Dec 21, 2008, 8:00 PM EST. It was in force for 17 hr.

The area

The counties it named.

The facts

Issued: Dec 21, 2008, 3:21 PM EST (20:21 UTC)
In effect from: Dec 21, 2008, 8:00 PM EST
Expired: Dec 22, 2008, 12:30 PM EST
In force: 17 hr
Issued by: NWS Baltimore/Washington

All 31 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 Harrisonburg, VA, City of Staunton, VA, City of Waynesboro, VA, City of Winchester, VA, Clarke County, VA, Fairfax County, VA, Frederick County, VA, Rockingham County, VA, Shenandoah 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), 28 km from the middle of the area, began a volume at 20:21 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

Wallops Is Stn, VA (KWAL), launched 12:00Z, 8.4 hours before the alert went out and 241 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: 508 m above ground
0-6 km bulk shear: 82 kt
0-1 km storm-relative helicity: 554 m²/s²
0-3 km storm-relative helicity: 525 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 wind advisory 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 wind advisory went out at Dec 21, 3:00 PM EST, 21 minutes earlier.

Area forecast discussion, Dec 21, 3:00 PM EST, 21 minutes before

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Hazardous weather outlook, Dec 21, 3:14 PM EST, 7 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
Dec 21, 10:00 AM EST	Wind Advisory	LWX	Culpeper, King George, Madison, Page, Rappahannock, Stafford and 1 more	27 hr
Dec 21, 3:17 PM EST	Wind Chill Advisory	LWX	Clarke, Frederick, Shenandoah, Warren, City of Winchester	21 hr
Dec 21, 3:17 PM EST	Winter Weather Advisory	LWX	Grant	21 hr

Nearby

Wind Advisories in Virginia, 2008 Wind Advisories in Maryland, 2008 Wind Advisories in West Virginia, 2008 Every wind advisory in 2008

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.