Alert archive / South Carolina / Frost Advisories in 2026

Frost Advisory 1, NWS Columbia, SC

March 18, 202618 counties in South Carolina; 5 counties in Georgia

NWS Columbia, SC issued this frost advisory at Mar 18, 2026, 2:21 PM EDT for 18 counties in South Carolina; 5 counties in Georgia. It took effect at Mar 19, 2026, 1:00 AM EDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: Mar 18, 2026, 2:21 PM EDT (18:21 UTC)
In effect from: Mar 19, 2026, 1:00 AM EDT
Expired: Mar 19, 2026, 9:00 AM EDT
In force: 8 hr
Issued by: NWS Columbia, SC

All 23 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, Orangeburg County, SC, Richland County, SC, Saluda County, SC, Sumter County, SC

The radar

The Columbia radar (KCAE), 22 km from the middle of the area, began a volume at 18:21 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 12:00Z, 6.4 hours before the alert went out and 300 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2010 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: -45 m²/s²
0-3 km storm-relative helicity: -1 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this frost advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Columbia, SC wrote its last area forecast discussion before this frost advisory went out at Mar 17, 7:32 PM EDT, 18 hours 49 minutes earlier.

Area forecast discussion, Mar 17, 7:32 PM EDT, 18 hours 49 minutes before

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Nearby

Frost Advisories in South Carolina, 2026 Frost Advisories in Georgia, 2026 Every frost advisory in 2026

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.