Alert archive / North Carolina / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 540
The Storm Prediction Center issued this severe thunderstorm watch at Jun 22, 2011, 5:38 PM EDT for 6 counties in Georgia; 27 counties in North Carolina; 12 counties in South Carolina. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 22, 2011, 5:38 PM EDT (21:38 UTC)
- Expired
- Jun 22, 2011, 10:38 PM EDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 45 counties
Elbert County, GA, Franklin County, GA, Habersham County, GA, Hart County, GA, Rabun County, GA, Stephens County, GA, Alexander County, NC, Avery County, NC, Buncombe County, NC, Burke County, NC, Cabarrus County, NC, Caldwell County, NC, Catawba County, NC, Cleveland County, NC, Davie County, NC, Gaston County, NC, Graham County, NC, Haywood County, NC, Henderson County, NC, Iredell County, NC, Jackson County, NC, Lincoln County, NC, Macon County, NC, Madison County, NC, McDowell County, NC, Mecklenburg County, NC, Mitchell County, NC, Polk County, NC, Rowan County, NC, Rutherford County, NC, Swain County, NC, Transylvania County, NC, Yancey County, NC, Abbeville County, SC, Anderson County, SC, Cherokee County, SC, Chester County, SC, Greenville County, SC, Greenwood County, SC, Laurens County, SC, Oconee County, SC, Pickens County, SC, Spartanburg County, SC, Union County, SC, York County, SC
The radar
The Greer radar (KGSP), 44 km from the middle of the area, began a volume at 21:38 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
- 10%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 50%
- 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
- 10%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
11 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 22, 6:08 PM EDT | Severe Thunderstorm Warning | GSP | Franklin, Habersham, Rabun, Stephens | 52 min |
| Jun 22, 6:10 PM EDT | Severe Thunderstorm Warning | GSP | Graham, Jackson, Macon, Swain | 50 min |
| Jun 22, 6:11 PM EDT | Severe Thunderstorm Warning | GSP | Elbert, Franklin, Hart, Stephens | 64 min |
| Jun 22, 6:53 PM EDT | Severe Thunderstorm Warning | GSP | Anderson, Greenville, Laurens, Pickens, Spartanburg | 52 min |
| Jun 22, 7:10 PM EDT | Severe Thunderstorm Warning | GSP | Elbert | 40 min |
| Jun 22, 7:20 PM EDT | Severe Thunderstorm Warning | GSP | Buncombe, Henderson, Polk, Rutherford, Transylvania | 55 min |
| Jun 22, 7:39 PM EDT | Severe Thunderstorm Warning | GSP | Cleveland, Polk, Rutherford | 66 min |
| Jun 22, 8:10 PM EDT | Severe Thunderstorm Warning | GSP | Burke, Cleveland, Gaston, Lincoln, McDowell, Polk and 1 more | 65 min |
| Jun 22, 8:13 PM EDT | Severe Thunderstorm Warning | GSP | Burke, Caldwell | 62 min |
| Jun 22, 8:46 PM EDT | Severe Thunderstorm Warning | GSP | Cabarrus, Catawba, Cleveland, Gaston, Iredell, Lincoln and 2 more | 59 min |
| Jun 22, 8:49 PM EDT | Severe Thunderstorm Warning | GSP | Alexander, Avery, Burke, Caldwell, Catawba, Cleveland and 4 more | 56 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, 9.6 hours before the alert went out and 261 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
- 249 J/kg
- Mixed-layer CIN
- -205 J/kg
- Mixed-layer LCL
- 1101 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 61 m²/s²
- 0-3 km storm-relative helicity
- 104 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 22, 4:44 PM EDT | Mesoscale Discussion | SPC | Banks, Clarke, Columbia, Elbert, Franklin, Glascock and 15 more | 91 min |
Nearby
Severe Thunderstorm Watches in North Carolina, 2011Severe Thunderstorm Watches in South Carolina, 2011Severe Thunderstorm Watches in Georgia, 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.