Alert archive / West Virginia / Winter Weather Advisories in 2011

Winter Weather Advisory 9, NWS Charleston, WV

February 21, 20116 counties in West Virginia; Morgan County, Perry County, Washington County, Ohio

NWS Charleston, WV issued this winter weather advisory at Feb 21, 2011, 3:30 PM EST for 6 counties in West Virginia; Morgan County, Perry County, Washington County, Ohio. It took effect at Feb 21, 2011, 10:00 PM EST. It was in force for 12 hr.

The area

The counties it named.

The facts

Issued
Feb 21, 2011, 3:30 PM EST (20:30 UTC)
In effect from
Feb 21, 2011, 10:00 PM EST
Expired
Feb 22, 2011, 10:00 AM EST
In force
12 hr
Issued by
NWS Charleston, WV

Counties Morgan County, OH, Perry County, OH, Washington County, OH, Barbour County, WV, Doddridge County, WV, Harrison County, WV, Pleasants County, WV, Taylor County, WV, Tyler County, WV

The radar

The Charleston,WV radar (KRLX), 138 km from the middle of the area, began a volume at 20:34 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

Pittsburgh, PA (KPIT), launched 12:00Z, 8.5 hours before the alert went out and 134 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, Pittsburgh, PA at 12:00Z on 2011-02-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Pittsburgh, PA at 12:00Z on 2011-02-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 65 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
447 m above ground
0-6 km bulk shear
77 kt
0-1 km storm-relative helicity
65 m²/s²
0-3 km storm-relative helicity
120 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS Charleston, WV issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Feb 21, 2:38 AM ESTWind AdvisoryRLX6 hr

Nearby

Winter Weather Advisories in West Virginia, 2011Winter Weather Advisories in Ohio, 2011Every winter weather advisory 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.