Alert archive / West Virginia / Severe Thunderstorm Watches in 2011

Severe Thunderstorm Watch 188

April 23, 20114 counties in Kentucky; 4 counties in Ohio; 29 counties in West Virginia

The Storm Prediction Center issued this severe thunderstorm watch at Apr 23, 2011, 4:39 PM EDT for 4 counties in Kentucky; 4 counties in Ohio; 29 counties in West Virginia. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
Apr 23, 2011, 4:39 PM EDT (20:39 UTC)
Expired
Apr 23, 2011, 8:34 PM EDT
In force
4 hr
Issued by
the Storm Prediction Center
Largest hail expected
1 in
Strongest gust expected
60 kt
All 37 counties

Boyd County, KY, Carter County, KY, Greenup County, KY, Lawrence County, KY, Gallia County, OH, Jackson County, OH, Lawrence County, OH, Meigs County, OH, Barbour County, WV, Boone County, WV, Braxton County, WV, Cabell County, WV, Calhoun County, WV, Clay County, WV, Doddridge County, WV, Fayette County, WV, Gilmer County, WV, Harrison County, WV, Jackson County, WV, Kanawha County, WV, Lewis County, WV, Lincoln County, WV, Mason County, WV, Nicholas County, WV, Pleasants County, WV, Pocahontas County, WV, Putnam County, WV, Randolph County, WV, Ritchie County, WV, Roane County, WV, Taylor County, WV, Tyler County, WV, Upshur County, WV, Wayne County, WV, Webster County, WV, Wirt County, WV, Wood County, WV

The radar

The Charleston,WV radar (KRLX), 64 km from the middle of the area, began a volume at 20:42 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
20%
One or more EF2 to EF5 tornadoes
5%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
30%
Ten or more severe hail reports
20%
One or more hailstones of 2 inches or more
5%
Six or more combined severe hail and wind reports
70%

Warnings issued inside it

7 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Apr 23, 4:42 PM EDTSevere Thunderstorm WarningRLXBoyd, Carter, Greenup, Lawrence48 min
Apr 23, 5:12 PM EDTSevere Thunderstorm WarningRLXGreenup63 min
Apr 23, 5:21 PM EDTSevere Thunderstorm WarningRLXBoyd, Carter, Lawrence54 min
Apr 23, 5:34 PM EDTTornado WarningRLXGallia, Lawrence26 min
Apr 23, 6:05 PM EDTSevere Thunderstorm WarningRLXBraxton, Calhoun, Clay, Fayette, Jackson, Kanawha and 3 more55 min
Apr 23, 6:19 PM EDTSevere Thunderstorm WarningRLXBoone, Fayette, Kanawha, Lincoln, Nicholas20 min
Apr 23, 6:56 PM EDTSevere Thunderstorm WarningRLXBraxton, Calhoun, Clay, Fayette, Gilmer, Kanawha and 7 more64 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 12:00Z, 8.7 hours before the alert went out and 167 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 2011-04-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 25 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, Cncnati-Daytn, OH at 12:00Z on 2011-04-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 405 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
25 J/kg
Mixed-layer CIN
-62 J/kg
Mixed-layer LCL
544 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
405 m²/s²
0-3 km storm-relative helicity
323 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 22, 10:20 PM EDTMesoscale DiscussionSPCAdair, Allen, Anderson, Ballard, Barren, Bath and 80 more55 min
Apr 23, 2:04 AM EDTTornado WatchSPCAdair, Anderson, Ballard, Barren, Boone, Bourbon and 67 more4 hr
Apr 23, 4:41 AM EDTMesoscale DiscussionSPCAnderson, Ballard, Bourbon, Boyle, Breckinridge, Bullitt and 45 more94 min
Apr 23, 5:22 AM EDTMesoscale DiscussionSPCAnderson, Boyle, Breckinridge, Bullitt, Butler, Caldwell and 24 more23 min
Apr 23, 11:51 AM EDTMesoscale DiscussionSPCAnderson, Bath, Boone, Bourbon, Boyd, Bracken and 43 more84 min
Apr 23, 2:04 PM EDTMesoscale DiscussionSPCBallard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 17 more86 min
Apr 23, 3:30 PM EDTTornado WatchSPCAdair, Allen, Anderson, Barren, Boyle, Breckinridge and 46 more5 hr
Apr 23, 3:56 PM EDTMesoscale DiscussionSPCBath, Bourbon, Boyd, Bracken, Carter, Clark and 14 more64 min
Apr 23, 6:09 PM EDTMesoscale DiscussionSPCBallard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 11 more2 hr
Apr 23, 6:38 PM EDTSevere Thunderstorm WatchSPCBallard, Carlisle, Fulton, Hickman6 hr
Apr 23, 7:35 PM EDTMesoscale DiscussionSPCAdair, Anderson, Barren, Bath, Bourbon, Boyle and 37 more55 min

Nearby

Severe Thunderstorm Watches in West Virginia, 2011Severe Thunderstorm Watches in Kentucky, 2011Severe Thunderstorm Watches in Ohio, 2011Every severe thunderstorm watch in 2011

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.