Alert archive / South Carolina / Severe Thunderstorm Watches in 2012
Severe Thunderstorm Watch 195
The Storm Prediction Center issued this severe thunderstorm watch at Apr 27, 2012, 5:36 PM EDT for 8 counties in Georgia; 38 counties in South Carolina. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 27, 2012, 5:36 PM EDT (21:36 UTC)
- Expired
- Apr 28, 2012, 12:00 AM EDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 46 counties
Columbia County, GA, Elbert County, GA, Franklin County, GA, Hart County, GA, Lincoln County, GA, McDuffie County, GA, Richmond County, GA, Stephens County, GA, Abbeville County, SC, Aiken County, SC, Anderson County, SC, Bamberg County, SC, Barnwell County, SC, Berkeley County, SC, Calhoun County, SC, Cherokee County, SC, Chester County, SC, Chesterfield County, SC, Clarendon County, SC, Darlington County, SC, Dillon County, SC, Edgefield County, SC, Fairfield County, SC, Florence County, SC, Georgetown County, SC, Greenville County, SC, Greenwood 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, McCormick County, SC, Newberry County, SC, Orangeburg County, SC, Pickens County, SC, Richland County, SC, Saluda County, SC, Spartanburg County, SC, Sumter County, SC, Union County, SC, Williamsburg County, SC, York County, SC
The radar
The Columbia radar (KCAE), 43 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
- 20%
- One or more gusts of 65 knots or more
- 5%
- Ten or more severe hail reports
- 60%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
10 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 27, 5:36 PM EDT | Severe Thunderstorm Warning | CAE | Lee | 24 min |
| Apr 27, 5:53 PM EDT | Severe Thunderstorm Warning | ILM | Florence, Marion | 42 min |
| Apr 27, 6:30 PM EDT | Severe Thunderstorm Warning | CAE | Chesterfield | 45 min |
| Apr 27, 6:32 PM EDT | Severe Thunderstorm Warning | GSP | Elbert, Hart | 58 min |
| Apr 27, 6:32 PM EDT | Severe Thunderstorm Warning | ILM | Horry | 28 min |
| Apr 27, 7:10 PM EDT | Severe Thunderstorm Warning | GSP | Chester | 27 min |
| Apr 27, 7:11 PM EDT | Severe Thunderstorm Warning | CAE | Fairfield | 49 min |
| Apr 27, 7:52 PM EDT | Severe Thunderstorm Warning | CAE | Clarendon, Sumter | 23 min |
| Apr 27, 10:25 PM EDT | Severe Thunderstorm Warning | ILM | Dillon, Horry, Marion | 50 min |
| Apr 27, 11:30 PM EDT | Severe Thunderstorm Warning | ILM | Horry, Marion | 45 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, 9.6 hours before the alert went out and 199 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
- 75 J/kg
- Mixed-layer CIN
- -239 J/kg
- Mixed-layer LCL
- 1255 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 120 m²/s²
- 0-3 km storm-relative helicity
- 179 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 |
|---|---|---|---|---|
| Apr 27, 11:34 AM EDT | Mesoscale Discussion | SPC | Barrow, Clarke, Columbia, Elbert, Glascock, Greene and 12 more | 56 min |
| Apr 27, 2:42 PM EDT | Mesoscale Discussion | SPC | Columbia, Elbert, Hart, Lincoln, Richmond, Wilkes | 2 hr |
Nearby
Severe Thunderstorm Watches in South Carolina, 2012Severe Thunderstorm Watches in Georgia, 2012Every severe thunderstorm watch in 2012
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.