Alert archive / West Virginia / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 138

April 21, 20024 states

The Storm Prediction Center issued this severe thunderstorm watch at Apr 21, 2002, 2:30 PM EDT for 4 states. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Apr 21, 2002, 2:30 PM EDT (18:30 UTC)
Expired
Apr 21, 2002, 7:00 PM EDT
In force
5 hr
Issued by
the Storm Prediction Center
All 48 counties

Boyd County, KY, Breathitt County, KY, Carter County, KY, Elliott County, KY, Floyd County, KY, Greenup County, KY, Johnson County, KY, Knott County, KY, Lawrence County, KY, Magoffin County, KY, Martin County, KY, Morgan County, KY, Pike County, KY, Wolfe County, KY, Lawrence County, OH, Scioto County, OH, Alleghany County, VA, Bland County, VA, Buchanan County, VA, City of Covington, VA, City of Radford, VA, City of Roanoke, VA, City of Salem, VA, Craig County, VA, Floyd County, VA, Giles County, VA, Montgomery County, VA, Pulaski County, VA, Roanoke County, VA, Tazewell County, VA, Wythe County, VA, Boone County, WV, Cabell County, WV, Fayette County, WV, Greenbrier County, WV, Kanawha County, WV, Lincoln County, WV, Logan County, WV, McDowell County, WV, Mercer County, WV, Mingo County, WV, Monroe County, WV, Nicholas County, WV, Putnam County, WV, Raleigh County, WV, Summers County, WV, Wayne County, WV, Wyoming County, WV

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 12:00Z, 6.5 hours before the alert went out and 228 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, Cncnati-Daytn, OH at 12:00Z on 2002-04-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCLEL10008507005003002001001 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, Cncnati-Daytn, OH at 12:00Z on 2002-04-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 390 square meters per square second.1939587897Sfc1 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
498 m above ground
0-6 km bulk shear
71 kt
0-1 km storm-relative helicity
390 m²/s²
0-3 km storm-relative helicity
453 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 21, 12:00 PM EDTSevere Thunderstorm WatchSPCBallard, Carlisle, Fulton, Hickman, McCracken5 hr
Apr 21, 1:45 PM EDTSevere Thunderstorm WatchSPCAnderson, Bath, Boone, Bourbon, Boyle, Bracken and 49 more5 hr
Apr 21, 3:15 PM EDTTornado WatchSPCBallard, Carlisle, Fulton, Hickman, McCracken4 hr
Apr 21, 6:30 PM EDTSevere Thunderstorm WatchSPCAnderson, Boone, Bourbon, Bracken, Breckinridge, Bullitt and 37 more5 hr

Nearby

Severe Thunderstorm Watches in West Virginia, 2002Severe Thunderstorm Watches in Virginia, 2002Severe Thunderstorm Watches in Kentucky, 2002Every severe thunderstorm watch in 2002

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.