Alert archive / South Carolina / Tornado Watches in 2018
Tornado Watch 408
The Storm Prediction Center issued this tornado watch at Oct 10, 2018, 11:38 PM EDT for 6 counties in Georgia; 42 counties in South Carolina. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Oct 10, 2018, 11:38 PM EDT (03:38 UTC)
- Expired
- Oct 11, 2018, 7:00 AM EDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 0.5 in
- Strongest gust expected
- 60 kt
All 48 counties
Burke County, GA, Columbia County, GA, Elbert County, GA, Lincoln County, GA, McDuffie County, GA, Richmond County, GA, Abbeville County, SC, Aiken County, SC, Allendale County, SC, Bamberg County, SC, Barnwell County, SC, Beaufort County, SC, Berkeley County, SC, Calhoun County, SC, Charleston County, SC, Cherokee County, SC, Chester County, SC, Chesterfield County, SC, Clarendon County, SC, Colleton County, SC, Darlington County, SC, Dillon County, SC, Dorchester County, SC, Edgefield County, SC, Fairfield County, SC, Florence County, SC, Georgetown County, SC, Greenwood County, SC, Hampton County, SC, Horry County, SC, Jasper 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, 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), 7 km from the middle of the area, began a volume at 03:37 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
- 50%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 5%
- One or more gusts of 65 knots or more
- 5%
- 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
- 20%
Warnings issued inside it
6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 10, 11:54 PM EDT | Tornado Warning | CAE | Calhoun, Lexington, Orangeburg, Richland | 21 min |
| Oct 11, 2:37 AM EDT | Tornado Warning | CAE | Newberry | 23 min |
| Oct 11, 2:45 AM EDT | Tornado Warning | GSP | Laurens, Union | 30 min |
| Oct 11, 3:12 AM EDT | Tornado Warning | GSP | Spartanburg, Union | 15 min |
| Oct 11, 4:15 AM EDT | Tornado Warning | CAE | Calhoun, Richland | 30 min |
| Oct 11, 6:10 AM EDT | Flash Flood Warning | CAE | Lexington, Richland | 4 hr |
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 00:00Z, 3.6 hours before the alert went out and 156 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
- 846 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 746 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 87 m²/s²
- 0-3 km storm-relative helicity
- 137 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 3.6
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 10, 9:08 PM EDT | Mesoscale Discussion | SPC | Appling, Atkinson, Bacon, Baldwin, Ben Hill, Berrien and 35 more | 2 hr |
| Oct 10, 11:08 PM EDT | Mesoscale Discussion | SPC | Anson, Union | 97 min |
| Oct 11, 4:34 AM EDT | Mesoscale Discussion | SPC | Anson, Bladen, Brunswick, Cabarrus, Chatham, Columbus and 22 more | 56 min |
| Oct 11, 8:31 AM EDT | Mesoscale Discussion | SPC | Alamance, Bladen, Caswell, Chatham, Cumberland, Duplin and 25 more | 89 min |
| Oct 11, 9:58 AM EDT | Tornado Watch | SPC | Alamance, Beaufort, Bertie, Bladen, Brunswick, Camden and 49 more | 13 hr |
| Oct 11, 12:48 PM EDT | Mesoscale Discussion | SPC | Beaufort, Bertie, Camden, Carteret, Chowan, Craven and 28 more | 117 min |
| Oct 11, 3:54 PM EDT | Mesoscale Discussion | SPC | Beaufort, Bertie, Camden, Caswell, Chowan, Currituck and 18 more | 2 hr |
Nearby
Tornado Watches in South Carolina, 2018Tornado Watches in Georgia, 2018Every tornado watch in 2018
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.