Alert archive / West Virginia / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 272
The Storm Prediction Center issued this severe thunderstorm watch at May 10, 2011, 7:45 PM EDT for 4 states. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- May 10, 2011, 7:45 PM EDT (23:45 UTC)
- Expired
- May 11, 2011, 1:00 AM EDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 40 counties
Bath County, KY, Boyd County, KY, Carter County, KY, Elliott County, KY, Fleming County, KY, Floyd County, KY, Greenup County, KY, Johnson County, KY, Lawrence County, KY, Magoffin County, KY, Martin County, KY, Menifee County, KY, Morgan County, KY, Pike County, KY, Rowan County, KY, Wolfe County, KY, Gallia County, OH, Lawrence County, OH, Meigs County, OH, Buchanan County, VA, Dickenson County, VA, Boone County, WV, Cabell County, WV, Calhoun County, WV, Clay County, WV, Fayette County, WV, Jackson County, WV, Kanawha County, WV, Lincoln County, WV, Logan County, WV, Mason County, WV, McDowell County, WV, Mingo County, WV, Nicholas County, WV, Putnam County, WV, Raleigh County, WV, Roane County, WV, Wayne County, WV, Wirt County, WV, Wyoming County, WV
The radar
The Charleston,WV radar (KRLX), 72 km from the middle of the area, began a volume at 23:45 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
16 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 10, 7:58 PM EDT | Severe Thunderstorm Warning | RLX | Boyd, Greenup, Lawrence | 62 min |
| May 10, 8:05 PM EDT | Tornado Warning | RLX | Lawrence | 25 min |
| May 10, 8:07 PM EDT | Severe Thunderstorm Warning | JKL | Elliott, Fleming, Morgan, Rowan | 38 min |
| May 10, 8:27 PM EDT | Severe Thunderstorm Warning | JKL | Johnson, Martin, Pike | 48 min |
| May 10, 8:34 PM EDT | Severe Thunderstorm Warning | JKL | Bath, Menifee, Morgan, Rowan | 41 min |
| May 10, 8:51 PM EDT | Severe Thunderstorm Warning | JKL | Breathitt, Floyd, Johnson, Knott, Magoffin, Morgan | 39 min |
| May 10, 9:01 PM EDT | Severe Thunderstorm Warning | JKL | Pike | 14 min |
| May 10, 9:10 PM EDT | Severe Thunderstorm Warning | JKL | Breathitt, Magoffin, Menifee, Morgan, Wolfe | 65 min |
| May 10, 9:12 PM EDT | Severe Thunderstorm Warning | JKL | Floyd, Martin, Pike | 28 min |
| May 10, 9:12 PM EDT | Severe Thunderstorm Warning | RLX | Buchanan, Dickenson | 48 min |
| May 10, 9:17 PM EDT | Severe Thunderstorm Warning | JKL | Pike | 13 min |
| May 10, 9:29 PM EDT | Severe Thunderstorm Warning | JKL | Breathitt, Floyd, Johnson, Knott, Magoffin | 21 min |
| May 10, 9:32 PM EDT | Severe Thunderstorm Warning | JKL | Floyd, Knott, Letcher, Pike | 28 min |
| May 10, 9:54 PM EDT | Severe Thunderstorm Warning | JKL | Floyd, Harlan, Knott, Letcher, Perry, Pike | 51 min |
| May 10, 10:05 PM EDT | Severe Thunderstorm Warning | JKL | Breathitt, Harlan, Knott, Letcher, Magoffin | 39 min |
| May 11, 12:08 AM EDT | Severe Thunderstorm Warning | RLX | Boyd, Greenup | 67 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, 11.8 hours before the alert went out and 178 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.
- Mixed-layer CAPE
- 9 J/kg
- Mixed-layer CIN
- -487 J/kg
- Mixed-layer LCL
- 1473 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 194 m²/s²
- 0-3 km storm-relative helicity
- 252 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.2
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 10, 11:21 AM EDT | Mesoscale Discussion | SPC | Anderson, Bath, Boone, Bourbon, Boyd, Bracken and 51 more | 114 min |
| May 10, 1:10 PM EDT | Severe Thunderstorm Watch | SPC | Anderson, Bath, Bell, Boone, Bourbon, Boyd and 74 more | 7 hr |
| May 10, 4:32 PM EDT | Mesoscale Discussion | SPC | Bath, Boyd, Bracken, Campbell, Carter, Elliott and 19 more | 88 min |
| May 10, 7:17 PM EDT | Mesoscale Discussion | SPC | Bath, Boyd, Breathitt, Carter, Elliott, Fleming and 17 more | 28 min |
| May 10, 3:31 PM EDT | Severe Thunderstorm Watch | SPC | Allen, Paulding, Putnam, Van Wert | 4 hr |
| May 10, 2:18 PM EDT | Mesoscale Discussion | SPC | Bland, Carroll, Grayson, Russell, Smyth, Tazewell and 4 more | 87 min |
| May 10, 3:20 PM EDT | Severe Thunderstorm Watch | SPC | Bland, Buchanan, Carroll, Dickenson, Floyd, Giles and 16 more | 8 hr |
| May 10, 6:02 PM EDT | Mesoscale Discussion | SPC | Bland, Buchanan, Carroll, Dickenson, Grayson, Russell and 9 more | 58 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.