Alert archive / West Virginia / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 247, NWS Baltimore/Washington

September 6, 20144 counties in West Virginia

NWS Baltimore/Washington issued this severe thunderstorm warning at Sep 6, 2014, 3:51 PM EDT for 4 counties in West Virginia. It was in force for 24 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Sep 6, 2014, 3:51 PM EDT (19:51 UTC)
Expired
Sep 6, 2014, 4:15 PM EDT
In force
24 min
Issued by
NWS Baltimore/Washington
Area
Storm-based polygon

Counties Grant County, WV, Hampshire County, WV, Hardy County, WV, Mineral County, WV

The radar

The Sterling radar (KLWX), 125 km from the middle of the area, began a volume at 19:55 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 12:00Z, 7.9 hours before the alert went out and 133 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, Washington/Dulle, VA at 12:00Z on 2014-09-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1444 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, Washington/Dulle, VA at 12:00Z on 2014-09-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 18 square meters per square second.1939Sfc1 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
1444 J/kg
Mixed-layer CIN
-42 J/kg
Mixed-layer LCL
867 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
18 m²/s²
0-3 km storm-relative helicity
65 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
Sep 6, 1:23 PM EDTSmall Craft AdvisoryLWX25 hr
Sep 6, 6:17 PM EDTSevere Thunderstorm WarningLWXClarke, Fauquier, Loudoun, Warren43 min
Sep 6, 6:40 PM EDTSevere Thunderstorm WarningLWXFairfax50 min
Sep 6, 6:54 PM EDTSpecial Marine WarningLWX66 min
Sep 6, 6:57 PM EDTSpecial Marine WarningLWX93 min
Sep 6, 7:22 PM EDTAreal Flood WarningLWXArlington, Fairfax, City of Fairfax, City of Falls Church113 min
Sep 6, 7:35 PM EDTSpecial Marine WarningLWX55 min
Sep 6, 7:45 PM EDTSpecial Marine WarningLWX90 min
Sep 6, 7:51 PM EDTSpecial Marine WarningLWX54 min
Sep 6, 1:57 PM EDTSevere Thunderstorm WarningLWXWashington28 min
Sep 6, 5:15 PM EDTSevere Thunderstorm WarningLWXFrederick, Washington45 min
Sep 6, 5:25 PM EDTSevere Thunderstorm WarningLWXFrederick, Washington50 min
Sep 6, 7:36 PM EDTSevere Thunderstorm WarningLWXAnne Arundel, Baltimore, Harford, Howard, City of Baltimore39 min

Nearby

Severe Thunderstorm Warnings in West Virginia, 2014Every severe thunderstorm warning in 2014

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.