Alert archive / West Virginia / Severe Thunderstorm Watches in 2011

Severe Thunderstorm Watch 333

May 22, 20115 states

The Storm Prediction Center issued this severe thunderstorm watch at May 22, 2011, 5:40 PM EDT for 5 states. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
May 22, 2011, 5:40 PM EDT (21:40 UTC)
Expired
May 22, 2011, 11:00 PM EDT
In force
5 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 79 counties

Boyd County, KY, Carter County, KY, Greenup County, KY, Lawrence County, KY, Alexander County, NC, Alleghany County, NC, Ashe County, NC, Avery County, NC, Buncombe County, NC, Burke County, NC, Caldwell County, NC, Graham County, NC, Haywood County, NC, Henderson County, NC, Jackson County, NC, Macon County, NC, Madison County, NC, McDowell County, NC, Mitchell County, NC, Polk County, NC, Rutherford County, NC, Swain County, NC, Transylvania County, NC, Watauga County, NC, Wilkes County, NC, Yancey County, NC, Athens County, OH, Gallia County, OH, Jackson County, OH, Lawrence County, OH, Meigs County, OH, Morgan County, OH, Perry County, OH, Vinton County, OH, Washington County, OH, Bland County, VA, Buchanan County, VA, Carroll County, VA, City of Galax, VA, Dickenson County, VA, Giles County, VA, Grayson County, VA, Pulaski County, VA, Smyth County, VA, Tazewell County, VA, Wythe County, VA, Boone County, WV, Braxton County, WV, Cabell County, WV, Calhoun County, WV, Clay County, WV, Doddridge County, WV, Fayette County, WV, Gilmer County, WV, Greenbrier County, WV, Harrison County, WV, Jackson County, WV, Kanawha County, WV, Lewis County, WV, Lincoln County, WV, Logan County, WV, Mason County, WV, McDowell County, WV, Mercer County, WV, Mingo County, WV, Monroe County, WV, Nicholas County, WV, Pleasants County, WV, Putnam County, WV, Raleigh County, WV, Ritchie County, WV, Roane County, WV, Summers County, WV, Tyler County, WV, Wayne County, WV, Webster County, WV, Wirt County, WV, Wood County, WV, Wyoming County, WV

The radar

The Charleston,WV radar (KRLX), 72 km from the middle of the area, began a volume at 21:41 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
30%
One or more hailstones of 2 inches or more
20%
Six or more combined severe hail and wind reports
70%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 22, 5:49 PM EDTSevere Thunderstorm WarningRLXLawrence56 min
May 22, 5:52 PM EDTSevere Thunderstorm WarningRLXAthens, Gallia, Jackson, Meigs, Vinton, Washington53 min
May 22, 6:03 PM EDTSevere Thunderstorm WarningRLXBoyd, Carter, Greenup, Lawrence57 min
May 22, 6:03 PM EDTSevere Thunderstorm WarningGSPBuncombe, Madison, Yancey57 min
May 22, 6:11 PM EDTSevere Thunderstorm WarningRNKAshe, Watauga49 min
May 22, 6:13 PM EDTSevere Thunderstorm WarningGSPBuncombe, Madison62 min
May 22, 6:19 PM EDTSevere Thunderstorm WarningRLXLawrence26 min
May 22, 6:46 PM EDTSevere Thunderstorm WarningGSPAvery, Caldwell44 min
May 22, 6:47 PM EDTSevere Thunderstorm WarningRNKAlleghany, Ashe43 min
May 22, 6:56 PM EDTSevere Thunderstorm WarningRNKAshe, Watauga, Wilkes64 min
May 22, 7:02 PM EDTSevere Thunderstorm WarningGSPBuncombe, Madison, Yancey58 min
May 22, 7:04 PM EDTSevere Thunderstorm WarningRLXBoone, Fayette, Kanawha, Lincoln, Logan, Raleigh and 2 more56 min
May 22, 7:08 PM EDTSevere Thunderstorm WarningRLXGallia, Jackson, Lawrence, Vinton37 min
May 22, 7:29 PM EDTSevere Thunderstorm WarningRLXAthens, Jackson, Vinton31 min
May 22, 7:41 PM EDTSevere Thunderstorm WarningGSPHenderson, Transylvania43 min
May 22, 7:44 PM EDTSevere Thunderstorm WarningRNKCarroll, Pulaski, Wythe61 min
May 22, 7:47 PM EDTSevere Thunderstorm WarningGSPBurke, McDowell, Yancey58 min
May 22, 8:02 PM EDTSevere Thunderstorm WarningRNKAlleghany, Ashe58 min
May 22, 8:17 PM EDTFlash Flood WarningRNKAshe, Watauga, Wilkes4 hr
May 22, 8:20 PM EDTSevere Thunderstorm WarningGSPAlexander, Burke, Caldwell, Catawba55 min
May 22, 8:20 PM EDTSevere Thunderstorm WarningRNKCraig, Giles, Montgomery, Pulaski, City of Radford55 min
May 22, 8:28 PM EDTSevere Thunderstorm WarningRNKBland, Pulaski, Smyth, Tazewell, Wythe32 min
May 22, 8:33 PM EDTFlash Flood WarningRNKAshe4 hr
May 22, 8:48 PM EDTFlash Flood WarningRNKBland, Craig, Giles, Montgomery, Pulaski4 hr
May 22, 8:54 PM EDTSevere Thunderstorm WarningGSPAlexander, Burke, Caldwell, Catawba, Iredell66 min
May 22, 9:11 PM EDTSevere Thunderstorm WarningRNKBotetourt, Craig, Giles, Montgomery, Pulaski, Roanoke and 3 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

Roanoke, VA (KRNK), launched 12:00Z, 9.7 hours before the alert went out and 222 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 2011-05-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 130 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, Roanoke, VA at 12:00Z on 2011-05-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 124 square meters per square second.1939Sfc1 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
130 J/kg
Mixed-layer CIN
-67 J/kg
Mixed-layer LCL
791 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
124 m²/s²
0-3 km storm-relative helicity
114 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 22, 1:55 PM EDTMesoscale DiscussionSPCAdair, Allen, Anderson, Barren, Bath, Bell and 64 more65 min
May 22, 2:18 PM EDTSevere Thunderstorm WatchSPCAdair, Allen, Anderson, Barren, Bath, Bell and 76 more7 hr
May 22, 2:51 PM EDTMesoscale DiscussionSPCBoone, Boyd, Bracken, Campbell, Carroll, Carter and 8 more54 min
May 22, 4:44 PM EDTMesoscale DiscussionSPCBath, Bell, Bourbon, Boyd, Bracken, Breathitt and 44 more61 min
May 22, 7:26 PM EDTMesoscale DiscussionSPCBoyd, Carter, Elliott, Floyd, Greenup, Johnson and 4 more2 hr
May 22, 3:15 PM EDTMesoscale DiscussionSPCFulton, Lucas, Williams60 min
May 22, 6:18 AM EDTMesoscale DiscussionSPCCrockett, Dyer, Fayette, Hardeman, Haywood, Lake and 3 more57 min
May 22, 8:03 AM EDTSevere Thunderstorm WatchSPCChester, Crockett, Decatur, Fayette, Hardeman, Hardin and 7 more7 hr
May 22, 2:09 PM EDTMesoscale DiscussionSPCChester, Fayette, Hardeman, Hardin, Haywood, McNairy and 3 more66 min

Nearby

Severe Thunderstorm Watches in West Virginia, 2011Severe Thunderstorm Watches in North Carolina, 2011Severe Thunderstorm Watches in Virginia, 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.