Alert archive / South Carolina / Areal Flood Advisories in 2025

Areal Flood Advisory 21, NWS Columbia, SC

May 12, 2025McCormick County, South Carolina; Lincoln County, Georgia

NWS Columbia, SC issued this areal flood advisory at May 12, 2025, 8:09 PM EDT for McCormick County, South Carolina; Lincoln County, Georgia. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued
May 12, 2025, 8:09 PM EDT (00:09 UTC)
Expired
May 12, 2025, 10:15 PM EDT
In force
2 hr
Issued by
NWS Columbia, SC
Area
Storm-based polygon

Counties Lincoln County, GA, McCormick County, SC

The radar

The Greer radar (KGSP), 116 km from the middle of the area, began a volume at 00:13 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

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 0.2 hours before the alert went out and 203 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, Peachtre/Fal Fld, GA at 00:00Z on 2025-05-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 363 joules per kilogram.LCLLFCEL10008507005003002001001 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, Peachtre/Fal Fld, GA at 00:00Z on 2025-05-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 65 square meters per square second.193958Sfc1 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
363 J/kg
Mixed-layer CIN
-13 J/kg
Mixed-layer LCL
1253 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
65 m²/s²
0-3 km storm-relative helicity
87 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.4

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
May 12, 8:33 PM EDTSpecial Weather StatementCAEMcCormick57 min
May 13, 11:11 AM EDTRiver Flood WarningCAEGreenwood, Newberry, Saluda70 hr
May 13, 12:17 PM EDTSpecial Weather StatementCAELancaster43 min
May 13, 12:46 PM EDTSpecial Weather StatementCAEKershaw44 min
May 13, 2:22 PM EDTSpecial Weather StatementCAEChesterfield38 min
May 12, 8:39 PM EDTSpecial Weather StatementCAEBurke66 min
May 12, 9:39 PM EDTSpecial Weather StatementCAERichmond36 min
May 12, 10:08 PM EDTSpecial Weather StatementCAERichmond37 min

Nearby

Areal Flood Advisories in South Carolina, 2025Areal Flood Advisories in Georgia, 2025Every areal flood advisory in 2025

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.