Alert archive / South Carolina / Flash Flood Watches in 2020
Flash Flood Watch 11, NWS Columbia, SC
NWS Columbia, SC issued this flash flood watch at Nov 11, 2020, 2:18 PM EST for 17 counties in South Carolina; 5 counties in Georgia. It took effect at Nov 12, 2020, 12:00 AM EST. It was in force for 14 hr.
The area
The counties it named.
The facts
- Issued
- Nov 11, 2020, 2:18 PM EST (19:18 UTC)
- In effect from
- Nov 12, 2020, 12:00 AM EST
- Expired
- Nov 12, 2020, 2:07 PM EST
- In force
- 14 hr
- Issued by
- NWS Columbia, SC
- Flood severity
- None
All 22 counties
Burke County, GA, Columbia County, GA, Lincoln County, GA, McDuffie County, GA, Richmond County, GA, Aiken County, SC, Bamberg County, SC, Barnwell County, SC, Calhoun County, SC, Chesterfield County, SC, Clarendon County, SC, Edgefield County, SC, Fairfield County, SC, Kershaw County, SC, Lancaster County, SC, Lee County, SC, Lexington County, SC, McCormick County, SC, Newberry County, SC, Richland County, SC, Saluda County, SC, Sumter County, SC
The radar
The Columbia radar (KCAE), 23 km from the middle of the area, began a volume at 19:17 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.
The nearest sounding before it
Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 7.3 hours before the alert went out and 281 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
- 101 J/kg
- Mixed-layer CIN
- -30 J/kg
- Mixed-layer LCL
- 514 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 223 m²/s²
- 0-3 km storm-relative helicity
- 272 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The office that day
Everything else NWS Columbia, SC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 11, 2:51 PM EST | Areal Flood Warning | CAE | Orangeburg | 3 hr |
| Nov 11, 4:19 PM EST | Flash Flood Warning | CAE | Orangeburg | 3 hr |
Nearby
Flash Flood Watches in South Carolina, 2020Flash Flood Watches in Georgia, 2020Every flash flood watch in 2020
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.