Alert archive / Virginia / Winter Storm Warnings in 2011

Winter Storm Warning 5, NWS Baltimore/Washington

October 28, 201117 counties in Virginia; 4 counties in Maryland; 8 counties in West Virginia

NWS Baltimore/Washington issued this winter storm warning at Oct 28, 2011, 2:31 PM EDT for 17 counties in Virginia; 4 counties in Maryland; 8 counties in West Virginia. It took effect at Oct 28, 2011, 8:00 PM EDT. It was in force for 22 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Oct 28, 2011, 2:31 PM EDT (18:31 UTC)
In effect from
Oct 28, 2011, 8:00 PM EDT
Expired
Oct 29, 2011, 6:00 PM EDT
In force
22 hr
Issued by
NWS Baltimore/Washington
All 29 counties

Allegany County, MD, Carroll County, 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, 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), 84 km from the middle of the area, began a volume at 18:33 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 12:00Z, 6.5 hours before the alert went out and 208 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 12:00Z on 2011-10-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCLLFCEL10008507005003002001001 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 12:00Z on 2011-10-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -10 square meters per square second.1939587897117136Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
605 m above ground
0-6 km bulk shear
68 kt
0-1 km storm-relative helicity
-10 m²/s²
0-3 km storm-relative helicity
186 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
Oct 28, 3:36 AM EDTWinter Storm WatchLWXClarke, Fauquier, Frederick, Greene, Highland, Madison and 11 more15 hr
Oct 28, 4:35 AM EDTSmall Craft AdvisoryLWX57 hr
Oct 28, 4:35 AM EDTSmall Craft AdvisoryLWX5 hr
Oct 28, 9:58 AM EDTGale WarningLWX37 hr
Oct 28, 4:31 PM EDTSmall Craft AdvisoryLWX46 hr
Oct 28, 6:32 PM EDTWinter Weather AdvisoryLWXFairfax, Fauquier, City of Fairfax11 hr

Nearby

Winter Storm Warnings in Virginia, 2011Winter Storm Warnings in West Virginia, 2011Winter Storm Warnings in Maryland, 2011Every winter storm warning 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.