Alert archive / Virginia / Wind Advisories in 2009

Wind Advisory 6, NWS Baltimore/Washington

April 3, 200915 counties in Virginia; 6 counties in Maryland; 7 counties in West Virginia

NWS Baltimore/Washington issued this wind advisory at Apr 3, 2009, 4:32 AM EDT for 15 counties in Virginia; 6 counties in Maryland; 7 counties in West Virginia. It took effect at Apr 3, 2009, 2:00 PM EDT. It was in force for 25 hr.

The area

The counties it named.

The facts

Issued: Apr 3, 2009, 4:32 AM EDT (08:32 UTC)
In effect from: Apr 3, 2009, 2:00 PM EDT
Expired: Apr 4, 2009, 2:59 PM EDT
In force: 25 hr
Issued by: NWS Baltimore/Washington

All 28 counties

Allegany County, MD, Baltimore County, MD, Carroll County, MD, City of Baltimore, MD, Frederick County, MD, Washington County, MD, City of Charlottesville, VA, City of Harrisonburg, VA, City of Staunton, VA, City of Waynesboro, VA, City of Winchester, VA, Clarke County, VA, Frederick County, VA, Greene 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

The radar

The Sterling radar (KLWX), 68 km from the middle of the area, began a volume at 08:34 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, 8.5 hours before the alert went out and 75 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: 582 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 47 m²/s²
0-3 km storm-relative helicity: 75 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 Apr 3, 4:07 AM EDT, 25 minutes earlier.

Area forecast discussion, Apr 3, 4:07 AM EDT, 25 minutes before

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The office that day

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

Issued	Product	Office	Lasted
Apr 3, 9:19 AM EDT	Special Marine Warning	LWX	41 min
Apr 3, 10:03 AM EDT	Special Marine Warning	LWX	33 min
Apr 3, 10:10 AM EDT	Special Marine Warning	LWX	54 min
Apr 3, 10:42 AM EDT	Special Marine Warning	LWX	63 min
Apr 3, 1:18 PM EDT	Special Marine Warning	LWX	42 min
Apr 3, 3:03 PM EDT	Gale Warning	LWX	27 hr

Nearby

Wind Advisories in Virginia, 2009 Wind Advisories in West Virginia, 2009 Wind Advisories in Maryland, 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.