Alert archive / South Carolina / Flash Flood Warnings in 2011

Flash Flood Warning 14, NWS Columbia, SC

September 25, 2011Richland County, South Carolina

NWS Columbia, SC issued this flash flood warning at Sep 25, 2011, 6:10 PM EDT for Richland County, South Carolina. It was in force for 80 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Sep 25, 2011, 6:10 PM EDT (22:10 UTC)
Expired
Sep 25, 2011, 7:30 PM EDT
In force
80 min
Issued by
NWS Columbia, SC
Area
Storm-based polygon
Flood severity
None

County Richland County, SC

The radar

The Columbia radar (KCAE), 21 km from the middle of the area, began a volume at 22:11 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

Charleston AFB, SC (KCHS), launched 12:00Z, 10.2 hours before the alert went out and 150 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.

Skew-T log-pSkew-T log-p diagram, Charleston AFB, SC at 12:00Z on 2011-09-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1927 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Charleston AFB, SC at 12:00Z on 2011-09-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 45 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1927 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
459 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
45 m²/s²
0-3 km storm-relative helicity
77 m²/s²
Significant tornado parameter
0.5
Supercell composite
3.3

Open this sounding in Storm Lab

The office that day

Everything else NWS Columbia, SC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 25, 1:48 PM EDTSpecial Weather StatementCAEMcCormick57 min
Sep 25, 4:22 PM EDTSpecial Weather StatementCAELancaster53 min
Sep 25, 4:41 PM EDTSpecial Weather StatementCAEEdgefield, Newberry, Saluda64 min
Sep 25, 5:11 PM EDTSevere Thunderstorm WarningCAEAiken, Edgefield, Lexington, Newberry, Richland, Saluda64 min
Sep 25, 5:53 PM EDTSevere Thunderstorm WarningCAECalhoun, Lexington, Richland67 min
Sep 25, 6:22 PM EDTSevere Thunderstorm WarningCAECalhoun, Lexington, Orangeburg, Richland, Sumter53 min
Sep 25, 7:07 PM EDTSevere Thunderstorm WarningCAEKershaw, Lee, Richland, Sumter53 min
Sep 25, 2:38 PM EDTSpecial Weather StatementCAERichmond67 min

Nearby

Flash Flood Warnings in South Carolina, 2011Every flash flood warning 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.