Alert archive / Virginia / Wind Advisories in 2010

Wind Advisory 1, NWS Baltimore/Washington

January 2, 201023 counties in Virginia; 11 counties in Maryland; 7 counties in West Virginia

NWS Baltimore/Washington issued this wind advisory at Jan 2, 2010, 4:21 AM EST for 23 counties in Virginia; 11 counties in Maryland; 7 counties in West Virginia. It took effect at Jan 2, 2010, 9:00 AM EST. It was in force for 33 hr.

The area

The counties it named.

The facts

Issued
Jan 2, 2010, 4:21 AM EST (09:21 UTC)
In effect from
Jan 2, 2010, 9:00 AM EST
Expired
Jan 3, 2010, 6:00 PM EST
In force
33 hr
Issued by
NWS Baltimore/Washington
All 41 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 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, Page County, VA, Rappahannock County, VA, Rockingham County, VA, Shenandoah 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), 38 km from the middle of the area, began a volume at 09:20 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

Roanoke, VA (KRNK), launched 00:00Z, 9.4 hours before the alert went out and 232 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-pSkew-T log-p diagram, Roanoke, VA at 00:00Z on 2010-01-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Roanoke, VA at 00:00Z on 2010-01-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -56 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
2 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
795 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
-56 m²/s²
0-3 km storm-relative helicity
-66 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Jan 2, 4:15 AM ESTWind Chill AdvisoryLWXClarke, Frederick, Greene, Madison, Nelson, Page and 9 more53 hr
Jan 2, 4:23 AM ESTSmall Craft AdvisoryLWX11 hr
Jan 2, 3:12 PM ESTSmall Craft AdvisoryLWX5 days

Nearby

Wind Advisories in Virginia, 2010Wind Advisories in Maryland, 2010Wind Advisories in West Virginia, 2010Every wind advisory 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.