Alert archive / South Carolina / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 843
The Storm Prediction Center issued this severe thunderstorm watch at Sep 5, 2011, 6:12 PM EDT for Burke County, Richmond County, Georgia; 11 counties in North Carolina; 18 counties in South Carolina. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 5, 2011, 6:12 PM EDT (22:12 UTC)
- Expired
- Sep 5, 2011, 10:07 PM EDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 31 counties
Burke County, GA, Richmond County, GA, Anson County, NC, Cumberland County, NC, Harnett County, NC, Hoke County, NC, Lee County, NC, Montgomery County, NC, Moore County, NC, Richmond County, NC, Robeson County, NC, Scotland County, NC, Stanly County, NC, Aiken County, SC, Bamberg County, SC, Barnwell County, SC, Calhoun County, SC, Chesterfield County, SC, Clarendon County, SC, Darlington County, SC, Dillon County, SC, Florence County, SC, Kershaw County, SC, Lee County, SC, Lexington County, SC, Marion County, SC, Marlboro County, SC, Orangeburg County, SC, Richland County, SC, Sumter County, SC, Williamsburg County, SC
The radar
The Columbia radar (KCAE), 91 km from the middle of the area, began a volume at 22:14 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
- 40%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 5%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
3 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 5, 6:37 PM EDT | Severe Thunderstorm Warning | CAE | Aiken, Calhoun, Edgefield, Fairfield, Kershaw, Lexington and 3 more | 38 min |
| Sep 5, 7:56 PM EDT | Tornado Warning | RAH | Stanly | 49 min |
| Sep 5, 8:40 PM EDT | Tornado Warning | RAH | Stanly | 31 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
Charleston AFB, SC (KCHS), launched 12:00Z, 10.2 hours before the alert went out and 175 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
- 175 J/kg
- Mixed-layer CIN
- -50 J/kg
- Mixed-layer LCL
- 1017 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 87 m²/s²
- 0-3 km storm-relative helicity
- 77 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 5, 5:26 AM EDT | Mesoscale Discussion | SPC | Clay, Early, Quitman, Seminole | 94 min |
| Sep 5, 6:35 AM EDT | Tornado Watch | SPC | Baker, Calhoun, Clay, Decatur, Dougherty, Early and 9 more | 10 hr |
| Sep 5, 8:24 AM EDT | Mesoscale Discussion | SPC | Baldwin, Barrow, Bibb, Butts, Carroll, Chattahoochee and 42 more | 66 min |
| Sep 5, 12:01 PM EDT | Mesoscale Discussion | SPC | Baker, Baldwin, Barrow, Bartow, Ben Hill, Berrien and 85 more | 29 min |
| Sep 5, 12:10 PM EDT | Tornado Watch | SPC | Bartow, Bibb, Butts, Carroll, Chattahoochee, Chattooga and 46 more | 4 hr |
| Sep 5, 1:23 PM EDT | Mesoscale Discussion | SPC | Baldwin, Burke, Columbia, Elbert, Emanuel, Glascock and 17 more | 67 min |
| Sep 5, 3:05 PM EDT | Mesoscale Discussion | SPC | Baldwin, Banks, Barrow, Bartow, Bibb, Bleckley and 75 more | 55 min |
| Sep 5, 3:42 PM EDT | Tornado Watch | SPC | Baldwin, Banks, Barrow, Bartow, Bibb, Bleckley and 81 more | 7 hr |
| Sep 5, 4:04 PM EDT | Severe Thunderstorm Watch | SPC | Baker, Ben Hill, Berrien, Brooks, Calhoun, Clay and 20 more | 6 hr |
| Sep 5, 4:15 PM EDT | Mesoscale Discussion | SPC | Baker, Ben Hill, Berrien, Brooks, Calhoun, Clay and 20 more | 30 min |
| Sep 5, 5:48 PM EDT | Mesoscale Discussion | SPC | Appling, Bacon, Brantley, Bryan, Bulloch, Camden and 19 more | 87 min |
| Sep 5, 7:37 PM EDT | Mesoscale Discussion | SPC | Baldwin, Banks, Barrow, Bartow, Bibb, Bleckley and 77 more | 113 min |
| Sep 5, 5:52 PM EDT | Mesoscale Discussion | SPC | Alamance, Alleghany, Ashe, Caswell, Chatham, Durham and 13 more | 53 min |
| Sep 5, 6:29 PM EDT | Tornado Watch | SPC | Alamance, Alleghany, Caswell, Davidson, Forsyth, Guilford and 6 more | 10 hr |
Nearby
Severe Thunderstorm Watches in South Carolina, 2011Severe Thunderstorm Watches in North 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.