Alert archive / Virginia / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 98, NWS Wakefield, VA

July 21, 20154 counties in Virginia

NWS Wakefield, VA issued this severe thunderstorm warning at Jul 21, 2015, 4:09 PM EDT for 4 counties in Virginia. It was in force for 51 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
Jul 21, 2015, 4:09 PM EDT (20:09 UTC)
Expired
Jul 21, 2015, 5:00 PM EDT
In force
51 min
Issued by
NWS Wakefield, VA
Area
Storm-based polygon

Counties Gloucester County, VA, King and Queen County, VA, Mathews County, VA, Middlesex County, VA

The radar

The Norfolk radar (KAKQ), 73 km from the middle of the area, began a volume at 20:13 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

Wallops Is Stn, VA (KWAL), launched 12:00Z, 8.2 hours before the alert went out and 112 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, Wallops Is Stn, VA at 12:00Z on 2015-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 899 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, Wallops Is Stn, VA at 12:00Z on 2015-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -12 square meters per square second.193958Sfc1 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
899 J/kg
Mixed-layer CIN
-39 J/kg
Mixed-layer LCL
1187 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
-12 m²/s²
0-3 km storm-relative helicity
28 m²/s²
Significant tornado parameter
-0.0
Supercell composite
-0.3

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 21, 3:57 AM EDTSmall Craft AdvisoryAKQ30 hr
Jul 21, 1:06 PM EDTSpecial Marine WarningAKQ54 min
Jul 21, 2:11 PM EDTSpecial Weather StatementAKQKing and Queen49 min
Jul 21, 3:00 PM EDTSpecial Weather StatementAKQKing and Queen, King William, Lancaster, Middlesex45 min
Jul 21, 3:40 PM EDTSpecial Weather StatementAKQGloucester, James City, New Kent50 min
Jul 21, 4:06 PM EDTSpecial Marine WarningAKQ84 min
Jul 21, 4:15 PM EDTSpecial Marine WarningAKQ75 min
Jul 21, 4:24 PM EDTSpecial Weather StatementAKQMathews, York36 min
Jul 21, 4:27 PM EDTSpecial Marine WarningAKQ63 min
Jul 21, 4:51 PM EDTSpecial Weather StatementAKQCity of Hampton24 min
Jul 21, 5:03 PM EDTSpecial Marine WarningAKQ27 min
Jul 21, 5:04 PM EDTSpecial Weather StatementAKQNorthampton26 min
Jul 21, 5:24 PM EDTSpecial Marine WarningAKQ51 min
Jul 21, 5:29 PM EDTSpecial Marine WarningAKQ91 min
Jul 20, 10:24 PM EDTSpecial Weather StatementAKQChowan, Pasquotank, Perquimans51 min
Jul 21, 7:19 PM EDTSpecial Weather StatementAKQCamden, Pasquotank56 min
Jul 21, 12:47 PM EDTSpecial Weather StatementAKQWorcester43 min
Jul 21, 4:20 PM EDTSpecial Weather StatementAKQWicomico40 min
Jul 21, 4:58 PM EDTSpecial Weather StatementAKQWorcester62 min
Jul 21, 5:50 PM EDTSpecial Weather StatementAKQWorcester25 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.