Alert archive / South Carolina / Flood Watches in 2023

Flood Watch 2, NWS Columbia, SC

August 29, 202318 counties in South Carolina; 5 counties in Georgia

NWS Columbia, SC issued this flood watch at Aug 29, 2023, 10:53 AM EDT for 18 counties in South Carolina; 5 counties in Georgia. It took effect at Aug 30, 2023, 2:00 PM EDT. It was in force for 12 hr.

The area

The counties it named.

The facts

Issued: Aug 29, 2023, 10:53 AM EDT (14:53 UTC)
In effect from: Aug 30, 2023, 2:00 PM EDT
Expired: Aug 31, 2023, 1:54 AM EDT
In force: 12 hr
Issued by: NWS Columbia, SC
Flood severity: None

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 14:56 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, 2.9 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.

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: 166 J/kg
Mixed-layer CIN: -83 J/kg
Mixed-layer LCL: 624 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 56 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 flood watch 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 flood watch went out at Aug 29, 10:15 AM EDT, 38 minutes earlier.

Area forecast discussion, Aug 29, 10:15 AM EDT, 38 minutes before

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Hazardous weather outlook, Aug 29, 4:58 AM EDT, 5 hours 55 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 28, 8:48 PM EDT	Areal Flood Advisory	CAE	Aiken, Barnwell	117 min
Aug 29, 11:02 AM EDT	Tropical Storm Watch	CAE	Aiken, Bamberg, Barnwell, Calhoun, Clarendon, Kershaw and 5 more	24 hr
Aug 29, 1:45 PM EDT	Special Weather Statement	CAE	Lexington	60 min
Aug 29, 4:03 PM EDT	River Flood Warning	CAE	Orangeburg	67 hr
Aug 29, 4:16 PM EDT	Special Weather Statement	CAE	Barnwell	29 min

Nearby

Flood Watches in South Carolina, 2023 Flood Watches in Georgia, 2023 Every flood watch in 2023

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.