Alert archive / Virginia / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 10, NWS Wakefield, VA

April 20, 2015Mecklenburg County, Virginia

NWS Wakefield, VA issued this severe thunderstorm warning at Apr 20, 2015, 5:02 PM EDT for Mecklenburg County, Virginia. It was in force for 43 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
Apr 20, 2015, 5:02 PM EDT (21:02 UTC)
Expired
Apr 20, 2015, 5:45 PM EDT
In force
43 min
Issued by
NWS Wakefield, VA
Area
Storm-based polygon

County Mecklenburg County, VA

The radar

The Raleigh/Durham radar (KRAX), 113 km from the middle of the area, began a volume at 21:03 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 20, 2:55 PM EDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Roanoke, VA (KRNK), launched 12:00Z, 9.0 hours before the alert went out and 116 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 2015-04-20Temperature 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, Roanoke, VA at 12:00Z on 2015-04-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 28 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
668 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
28 m²/s²
0-3 km storm-relative helicity
129 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 20, 3:16 AM EDTSpecial Weather StatementAKQIsle of Wight, Southampton, Surry, City of Franklin, City of Williamsburg44 min
Apr 20, 4:00 AM EDTSpecial Weather StatementAKQGloucester, Isle of Wight, Mathews, York, City of Chesapeake, City of Hampton and 6 more60 min
Apr 20, 5:20 AM EDTSpecial Marine WarningAKQ55 min
Apr 20, 5:30 AM EDTSpecial Weather StatementAKQCity of Virginia Beach45 min
Apr 20, 10:09 AM EDTSmall Craft AdvisoryAKQ5 hr
Apr 20, 11:01 AM EDTRiver Flood WarningAKQFluvanna17 hr
Apr 20, 4:53 PM EDTSpecial Weather StatementAKQDinwiddie, Lunenburg, Nottoway, Prince Edward67 min
Apr 20, 5:44 PM EDTSpecial Weather StatementAKQBrunswick, Mecklenburg46 min
Apr 20, 6:02 PM EDTSevere Thunderstorm WarningAKQGreensville, Southampton, City of Emporia43 min
Apr 20, 6:16 PM EDTSpecial Weather StatementAKQSussex29 min
Apr 20, 6:27 PM EDTSpecial Weather StatementAKQDinwiddie33 min
Apr 20, 6:43 PM EDTSevere Thunderstorm WarningAKQIsle of Wight, Southampton, City of Franklin, City of Suffolk32 min
Apr 20, 7:10 PM EDTSpecial Weather StatementAKQCity of Franklin, City of Suffolk50 min
Apr 20, 7:31 PM EDTSpecial Weather StatementAKQSurry29 min
Apr 20, 2:36 AM EDTSpecial Weather StatementAKQHertford39 min
Apr 20, 4:52 AM EDTSpecial Weather StatementAKQCamden, Pasquotank38 min

Nearby

Severe Thunderstorm Warnings in Virginia, 2015Every severe thunderstorm warning in 2015

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.