Alert archive / Virginia / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 193, NWS Blacksburg, VA

October 7, 2013Henry County, Pittsylvania County, Virginia

NWS Blacksburg, VA issued this severe thunderstorm warning at Oct 7, 2013, 8:56 AM EDT for Henry County, Pittsylvania County, Virginia. It was in force for 34 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
Oct 7, 2013, 8:56 AM EDT (12:56 UTC)
Expired
Oct 7, 2013, 9:30 AM EDT
In force
34 min
Issued by
NWS Blacksburg, VA
Area
Storm-based polygon

Counties Henry County, VA, Pittsylvania County, VA

The radar

The Roanoke radar (KFCX), 60 km from the middle of the area, began a volume at 12:58 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, 0.9 hours before the alert went out and 316 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 2013-10-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 121 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 2013-10-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 135 square meters per square second.19395878Sfc1 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
121 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
668 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
135 m²/s²
0-3 km storm-relative helicity
191 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.1

Open this sounding in Storm Lab

The office that day

Everything else NWS Blacksburg, VA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 7, 4:16 AM EDTSpecial Weather StatementRNKBotetourt, Floyd, Montgomery, Roanoke, City of Roanoke, City of Salem59 min
Oct 7, 4:28 AM EDTSpecial Weather StatementRNKCarroll, City of Galax62 min
Oct 7, 5:26 AM EDTSpecial Weather StatementRNKFloyd, Montgomery, Patrick, Roanoke, City of Roanoke, City of Salem64 min
Oct 7, 6:31 AM EDTSpecial Weather StatementRNKAmherst, Rockbridge, City of Buena Vista, City of Lexington29 min
Oct 7, 6:35 AM EDTSpecial Weather StatementRNKBedford, Franklin, Henry, City of Martinsville55 min
Oct 7, 7:32 AM EDTSpecial Weather StatementRNKAmherst, Bedford, City of Buena Vista, City of Lynchburg58 min
Oct 7, 8:05 AM EDTSpecial Weather StatementRNKHenry, City of Martinsville40 min
Oct 7, 8:50 AM EDTSpecial Weather StatementRNKPittsylvania, City of Danville40 min
Oct 7, 9:10 AM EDTTornado WarningRNKPittsylvania, City of Danville35 min
Oct 7, 9:33 AM EDTSpecial Weather StatementRNKAppomattox, Buckingham, Campbell, Charlotte42 min
Oct 7, 9:45 AM EDTSpecial Weather StatementRNKHalifax, City of Danville30 min
Oct 7, 3:35 AM EDTSpecial Weather StatementRNKSurry, Wilkes, Yadkin55 min

Nearby

Severe Thunderstorm Warnings in Virginia, 2013Every severe thunderstorm warning in 2013

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.