Alert archive / Virginia / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 110
The Storm Prediction Center issued this severe thunderstorm watch at Apr 8, 2011, 11:07 PM EDT for 4 states. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 8, 2011, 11:07 PM EDT (03:07 UTC)
- Expired
- Apr 9, 2011, 5:00 AM EDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 43 counties
Breathitt County, KY, Estill County, KY, Floyd County, KY, Knott County, KY, Lee County, KY, Letcher County, KY, Magoffin County, KY, Owsley County, KY, Perry County, KY, Pike County, KY, Powell County, KY, Wolfe County, KY, Alleghany County, NC, Ashe County, NC, Rockingham County, NC, Stokes County, NC, Surry County, NC, Watauga County, NC, Wilkes County, NC, Yadkin County, NC, Bland County, VA, Buchanan County, VA, Carroll County, VA, City of Bristol, VA, City of Galax, VA, City of Martinsville, VA, City of Norton, VA, City of Radford, VA, Dickenson County, VA, Floyd County, VA, Giles County, VA, Grayson County, VA, Henry County, VA, Patrick County, VA, Pulaski County, VA, Russell County, VA, Smyth County, VA, Tazewell County, VA, Washington County, VA, Wise County, VA, Wythe County, VA, McDowell County, WV, Mercer County, WV
The radar
The Jackson,KY radar (KJKL), 136 km from the middle of the area, began a volume at 03:09 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
- 5%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
13 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 8, 11:11 PM EDT | Severe Thunderstorm Warning | RNK | Bland, Smyth, Tazewell, Wythe | 49 min |
| Apr 8, 11:26 PM EDT | Severe Thunderstorm Warning | JKL | Breathitt, Lee, Magoffin, Wolfe | 49 min |
| Apr 8, 11:53 PM EDT | Severe Thunderstorm Warning | JKL | Floyd, Knott, Letcher, Pike | 37 min |
| Apr 8, 11:58 PM EDT | Severe Thunderstorm Warning | RNK | Rockingham, Stokes | 32 min |
| Apr 9, 12:00 AM EDT | Severe Thunderstorm Warning | RNK | Bland, Carroll, Grayson, Smyth, Wythe | 30 min |
| Apr 9, 12:03 AM EDT | Severe Thunderstorm Warning | JKL | Breathitt, Knott, Perry | 42 min |
| Apr 9, 12:03 AM EDT | Severe Thunderstorm Warning | RLX | Buchanan, Dickenson | 42 min |
| Apr 9, 12:27 AM EDT | Severe Thunderstorm Warning | RNK | Alleghany, Surry | 48 min |
| Apr 9, 12:46 AM EDT | Severe Thunderstorm Warning | MRX | Russell, Washington, Wise | 59 min |
| Apr 9, 12:56 AM EDT | Tornado Warning | RNK | Alleghany, Surry | 34 min |
| Apr 9, 1:26 AM EDT | Severe Thunderstorm Warning | RNK | Stokes, Surry, Yadkin | 35 min |
| Apr 9, 1:28 AM EDT | Severe Thunderstorm Warning | RNK | Alleghany, Surry, Wilkes, Yadkin | 35 min |
| Apr 9, 2:34 AM EDT | Severe Thunderstorm Warning | RNK | Alleghany, Ashe | 41 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
Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 3.1 hours before the alert went out and 212 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
- 42 J/kg
- Mixed-layer CIN
- -165 J/kg
- Mixed-layer LCL
- 1618 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 279 m²/s²
- 0-3 km storm-relative helicity
- 424 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.3
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 9, 12:42 AM EDT | Mesoscale Discussion | SPC | Knott, Letcher, Perry | 93 min |
| Apr 9, 7:41 AM EDT | Mesoscale Discussion | SPC | Adair, Allen, Anderson, Barren, Bourbon, Boyle and 72 more | 2 hr |
| Apr 9, 8:25 AM EDT | Severe Thunderstorm Watch | SPC | Adair, Allen, Anderson, Ballard, Barren, Bourbon and 72 more | 6 hr |
| Apr 9, 12:07 PM EDT | Mesoscale Discussion | SPC | Bath, Bell, Breathitt, Clark, Clay, Clinton and 25 more | 83 min |
| Apr 9, 12:34 PM EDT | Severe Thunderstorm Watch | SPC | Bath, Bell, Boyd, Breathitt, Carter, Clay and 30 more | 4 hr |
| Apr 9, 2:00 PM EDT | Tornado Watch | SPC | Bell, Boyd, Breathitt, Carter, Clay, Elliott and 27 more | 7 hr |
| Apr 8, 9:10 PM EDT | Mesoscale Discussion | SPC | Alamance, Caswell, Chatham, Davidson, Durham, Forsyth and 11 more | 65 min |
| Apr 9, 3:23 AM EDT | Mesoscale Discussion | SPC | Alexander, Alleghany, Ashe, Avery, Burke, Cabarrus and 19 more | 67 min |
| Apr 9, 2:44 PM EDT | Severe Thunderstorm Watch | SPC | Alexander, Anson, Cabarrus, Catawba, Cleveland, Davie and 7 more | 6 hr |
| Apr 9, 4:21 PM EDT | Mesoscale Discussion | SPC | Ashe, Avery, Buncombe, Burke, Caldwell, Cherokee and 15 more | 84 min |
| Apr 9, 5:36 PM EDT | Mesoscale Discussion | SPC | Cleveland, Gaston, Lincoln, Mecklenburg, Polk, Rutherford and 1 more | 54 min |
| Apr 9, 6:16 PM EDT | Tornado Watch | SPC | Buncombe, Burke, Cleveland, Gaston, Haywood, Henderson and 10 more | 6 hr |
| Apr 9, 7:59 PM EDT | Mesoscale Discussion | SPC | Anson, Buncombe, Burke, Cabarrus, Catawba, Cleveland and 13 more | 61 min |
Nearby
Severe Thunderstorm Watches in Virginia, 2011Severe Thunderstorm Watches in Kentucky, 2011Severe Thunderstorm Watches in North Carolina, 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.