Alert archive / Virginia / Wind Advisories in 2009

Wind Advisory 10, NWS Baltimore/Washington

December 9, 200926 counties in Virginia; 11 counties in Maryland; 7 counties in West Virginia

NWS Baltimore/Washington issued this wind advisory at Dec 9, 2009, 4:02 AM EST for 26 counties in Virginia; 11 counties in Maryland; 7 counties in West Virginia. It took effect at Dec 9, 2009, 11:00 AM EST. It was in force for 10 hr.

The area

The counties it named.

The facts

Issued: Dec 9, 2009, 4:02 AM EST (09:02 UTC)
In effect from: Dec 9, 2009, 11:00 AM EST
Expired: Dec 9, 2009, 9:24 PM EST
In force: 10 hr
Issued by: NWS Baltimore/Washington

All 44 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 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), 39 km from the middle of the area, began a volume at 09:03 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, 9.0 hours before the alert went out and 44 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: 1037 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 95 m²/s²
0-3 km storm-relative helicity: 157 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 9, 1:41 AM EST, 2 hours 21 minutes earlier.

Area forecast discussion, Dec 9, 1:41 AM EST, 2 hours 21 minutes before

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Hazardous weather outlook, Dec 8, 10:39 PM EST, 5 hours 23 minutes before

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      <div class="status" id="status">Temporary Notice</div>
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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
Dec 9, 3:57 AM EST	Gale Warning	LWX		24 hr
Dec 9, 5:15 AM EST	Areal Flood Warning	LWX	Arlington, Fairfax, City of Alexandria, City of Fairfax, City of Falls Church	2 hr
Dec 9, 9:20 AM EST	Coastal Flood Advisory	LWX	Arlington, Fairfax, King George, Stafford, City of Alexandria, City of Fairfax and 1 more	20 hr
Dec 9, 2:07 PM EST	High Wind Warning	LWX		5 hr
Dec 9, 3:12 PM EST	Small Craft Advisory	LWX		61 hr

Nearby

Wind Advisories in Virginia, 2009 Wind Advisories in Maryland, 2009 Wind Advisories in West Virginia, 2009 Every wind advisory in 2009

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.