Alert archive / North Carolina / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 269
The Storm Prediction Center issued this severe thunderstorm watch at May 10, 2011, 3:20 PM EDT for 5 states. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- May 10, 2011, 3:20 PM EDT (19:20 UTC)
- Expired
- May 10, 2011, 11:00 PM EDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 3.5 in
- Strongest gust expected
- 60 kt
All 123 counties
Alexander County, NC, Alleghany County, NC, Anson County, NC, Ashe County, NC, Avery County, NC, Bladen County, NC, Brunswick County, NC, Buncombe County, NC, Burke County, NC, Cabarrus County, NC, Caldwell County, NC, Catawba County, NC, Cleveland County, NC, Columbus County, NC, Cumberland County, NC, Davidson County, NC, Davie County, NC, Forsyth County, NC, Gaston County, NC, Guilford County, NC, Haywood County, NC, Henderson County, NC, Hoke County, NC, Iredell County, NC, Lincoln County, NC, Madison County, NC, McDowell County, NC, Mecklenburg County, NC, Mitchell County, NC, Montgomery County, NC, Moore County, NC, New Hanover County, NC, Pender County, NC, Polk County, NC, Randolph County, NC, Richmond County, NC, Robeson County, NC, Rowan County, NC, Rutherford County, NC, Scotland County, NC, Stanly County, NC, Stokes County, NC, Surry County, NC, Union County, NC, Watauga County, NC, Wilkes County, NC, Yadkin County, NC, Yancey County, NC, Berkeley County, SC, Calhoun County, SC, Charleston County, SC, Cherokee County, SC, Chester County, SC, Chesterfield County, SC, Clarendon County, SC, Darlington County, SC, Dillon County, SC, Dorchester County, SC, Fairfield County, SC, Florence County, SC, Georgetown County, SC, Greenville County, SC, Horry County, SC, Kershaw County, SC, Lancaster County, SC, Laurens County, SC, Lee County, SC, Lexington County, SC, Marion County, SC, Marlboro County, SC, Newberry County, SC, Orangeburg County, SC, Richland County, SC, Spartanburg County, SC, Sumter County, SC, Union County, SC, Williamsburg County, SC, York County, SC, Campbell County, TN, Carter County, TN, Claiborne County, TN, Cocke County, TN, Grainger County, TN, Greene County, TN, Hamblen County, TN, Hancock County, TN, Hawkins County, TN, Jefferson County, TN, Johnson County, TN, Knox County, TN, Sevier County, TN, Sullivan County, TN, Unicoi County, TN, Union County, TN, Washington County, TN, Bland County, VA, Buchanan County, VA, Carroll County, VA, City of Bristol, VA, City of Galax, VA, City of Norton, VA, City of Radford, VA, Dickenson County, VA, Floyd County, VA, Giles County, VA, Grayson County, VA, Lee County, VA, Montgomery County, VA, Patrick County, VA, Pulaski County, VA, Russell County, VA, Scott County, VA, Smyth County, VA, Tazewell County, VA, Washington County, VA, Wise County, VA, Wythe County, VA, McDowell County, WV, Mercer County, WV, Monroe County, WV, Raleigh County, WV, Summers County, WV, Wyoming County, WV
The radar
The Greer radar (KGSP), 95 km from the middle of the area, began a volume at 19:22 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
- 60%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 90%
- One or more hailstones of 2 inches or more
- 60%
- Six or more combined severe hail and wind reports
- 95%
Warnings issued inside it
53 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 10, 3:21 PM EDT | Severe Thunderstorm Warning | MRX | Carter, Johnson, Sullivan | 32 min |
| May 10, 3:47 PM EDT | Severe Thunderstorm Warning | RNK | Bland, Smyth, Tazewell, Wythe | 42 min |
| May 10, 4:33 PM EDT | Severe Thunderstorm Warning | ILM | Brunswick, Columbus | 42 min |
| May 10, 4:42 PM EDT | Severe Thunderstorm Warning | RNK | Carroll, Floyd, Patrick | 63 min |
| May 10, 4:47 PM EDT | Severe Thunderstorm Warning | GSP | Burke, Cleveland, Lincoln, Rutherford | 58 min |
| May 10, 5:15 PM EDT | Severe Thunderstorm Warning | ILM | Brunswick, Columbus | 30 min |
| May 10, 5:27 PM EDT | Severe Thunderstorm Warning | ILM | Florence, Marion | 63 min |
| May 10, 5:36 PM EDT | Severe Thunderstorm Warning | RNK | Stokes, Surry | 54 min |
| May 10, 5:39 PM EDT | Tornado Warning | ILM | Horry | 30 min |
| May 10, 5:44 PM EDT | Severe Thunderstorm Warning | GSP | Cleveland, Rutherford | 31 min |
| May 10, 6:00 PM EDT | Severe Thunderstorm Warning | RLX | Clay, Fayette, Kanawha, Nicholas, Raleigh | 45 min |
| May 10, 6:03 PM EDT | Severe Thunderstorm Warning | RNK | Giles | 57 min |
| May 10, 6:13 PM EDT | Severe Thunderstorm Warning | ILM | Horry, Marion | 77 min |
| May 10, 6:16 PM EDT | Severe Thunderstorm Warning | ILM | Robeson | 44 min |
| May 10, 6:19 PM EDT | Severe Thunderstorm Warning | ILM | Florence, Georgetown, Williamsburg | 56 min |
| May 10, 6:25 PM EDT | Severe Thunderstorm Warning | GSP | Greenville, Spartanburg | 65 min |
| May 10, 6:40 PM EDT | Severe Thunderstorm Warning | ILM | Columbus, Robeson | 50 min |
| May 10, 6:42 PM EDT | Severe Thunderstorm Warning | RNK | Smyth, Tazewell | 78 min |
| May 10, 6:44 PM EDT | Severe Thunderstorm Warning | GSP | Spartanburg | 31 min |
| May 10, 6:49 PM EDT | Severe Thunderstorm Warning | RNK | Greenbrier, Monroe | 56 min |
| May 10, 6:50 PM EDT | Severe Thunderstorm Warning | RNK | Carroll, Floyd, Montgomery, Pulaski, City of Radford | 24 min |
| May 10, 6:51 PM EDT | Severe Thunderstorm Warning | GSP | Polk, Rutherford | 39 min |
| May 10, 7:08 PM EDT | Severe Thunderstorm Warning | GSP | Greenville, Laurens, Spartanburg | 52 min |
| May 10, 7:12 PM EDT | Severe Thunderstorm Warning | ILM | Georgetown, Williamsburg | 63 min |
| May 10, 7:15 PM EDT | Severe Thunderstorm Warning | ILM | Bladen, Columbus, Robeson | 60 min |
| May 10, 7:16 PM EDT | Severe Thunderstorm Warning | ILM | Florence, Georgetown, Williamsburg | 31 min |
| May 10, 7:24 PM EDT | Tornado Warning | ILM | Georgetown, Williamsburg | 51 min |
| May 10, 7:29 PM EDT | Severe Thunderstorm Warning | CHS | Berkeley, Charleston | 61 min |
| May 10, 7:43 PM EDT | Severe Thunderstorm Warning | RLX | Fayette, Kanawha, Raleigh, Wyoming | 47 min |
| May 10, 7:54 PM EDT | Severe Thunderstorm Warning | GSP | Greenville, Greenwood, Laurens | 57 min |
| May 10, 8:09 PM EDT | Severe Thunderstorm Warning | ILM | Brunswick, Columbus | 66 min |
| May 10, 8:09 PM EDT | Flash Flood Warning | RNK | Montgomery | 6 hr |
| May 10, 8:10 PM EDT | Severe Thunderstorm Warning | ILM | Georgetown, Williamsburg | 65 min |
| May 10, 8:29 PM EDT | Severe Thunderstorm Warning | CHS | Berkeley, Charleston | 61 min |
| May 10, 9:12 PM EDT | Severe Thunderstorm Warning | RLX | Buchanan, Dickenson | 48 min |
| May 10, 9:14 PM EDT | Severe Thunderstorm Warning | ILM | Georgetown | 31 min |
| May 10, 9:18 PM EDT | Severe Thunderstorm Warning | ILM | Brunswick | 27 min |
| May 10, 9:27 PM EDT | Severe Thunderstorm Warning | ILM | New Hanover | 33 min |
| May 10, 9:29 PM EDT | Severe Thunderstorm Warning | CHS | Berkeley, Charleston | 61 min |
| May 10, 9:32 PM EDT | Severe Thunderstorm Warning | MRX | Russell, Washington, Wise, City of Bristol | 43 min |
| May 10, 9:38 PM EDT | Severe Thunderstorm Warning | MRX | Scott, Wise, City of Norton | 52 min |
| May 10, 10:06 PM EDT | Severe Thunderstorm Warning | MRX | Carter, Johnson, Sullivan | 39 min |
| May 10, 10:06 PM EDT | Flash Flood Warning | RNK | Smyth, Tazewell | 6 hr |
| May 10, 10:16 PM EDT | Severe Thunderstorm Warning | CHS | Berkeley, Charleston | 59 min |
| May 10, 10:16 PM EDT | Severe Thunderstorm Warning | MRX | Hawkins, Sullivan, Washington | 59 min |
| May 10, 10:23 PM EDT | Severe Thunderstorm Warning | ILM | Georgetown | 37 min |
| May 10, 10:30 PM EDT | Severe Thunderstorm Warning | MRX | Lee, Scott, Wise | 42 min |
| May 10, 10:31 PM EDT | Severe Thunderstorm Warning | GSP | Avery, Buncombe, Burke, Caldwell, McDowell, Mitchell and 1 more | 59 min |
| May 10, 10:31 PM EDT | Severe Thunderstorm Warning | RNK | Alleghany, Ashe, Watauga, Wilkes | 59 min |
| May 10, 10:33 PM EDT | Severe Thunderstorm Warning | MRX | Carter, Greene, Johnson, Unicoi, Washington | 42 min |
| May 10, 10:54 PM EDT | Severe Thunderstorm Warning | GSP | Alexander, Caldwell, Catawba, Iredell | 66 min |
| May 10, 10:58 PM EDT | Severe Thunderstorm Warning | CHS | Charleston | 16 min |
| May 10, 10:58 PM EDT | Severe Thunderstorm Warning | MRX | Greene, Hancock, Hawkins | 47 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 12:00Z, 7.3 hours before the alert went out and 154 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1295 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 88 m²/s²
- 0-3 km storm-relative helicity
- 228 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.0
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 | Alleghany, Ashe, Avery, McDowell, Mitchell, Watauga and 1 more | 114 min |
| May 10, 2:18 PM EDT | Mesoscale Discussion | SPC | Alexander, Alleghany, Anson, Ashe, Avery, Bladen and 35 more | 87 min |
| May 10, 6:02 PM EDT | Mesoscale Discussion | SPC | Alexander, Alleghany, Anson, Ashe, Avery, Bladen and 46 more | 58 min |
| May 10, 7:45 PM EDT | Severe Thunderstorm Watch | SPC | Buchanan, Dickenson | 5 hr |
| May 10, 1:10 PM EDT | Severe Thunderstorm Watch | SPC | Boone, Cabell, Calhoun, Clay, Fayette, Jackson and 11 more | 7 hr |
| May 10, 4:32 PM EDT | Mesoscale Discussion | SPC | Cabell, Lincoln, Logan, Mason, Mingo, Putnam and 1 more | 88 min |
| May 10, 7:17 PM EDT | Mesoscale Discussion | SPC | Boone, Cabell, Calhoun, Jackson, Kanawha, Lincoln and 9 more | 28 min |
Nearby
Severe Thunderstorm Watches in North Carolina, 2011Severe Thunderstorm Watches in South 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.