Alert archive / South Carolina / Areal Flood Advisories in 2021

Areal Flood Advisory 89, NWS Columbia, SC

October 7, 2021McCormick County, South Carolina; Lincoln County, Georgia

NWS Columbia, SC issued this areal flood advisory at Oct 7, 2021, 9:47 AM EDT for McCormick County, South Carolina; Lincoln County, Georgia. It was in force for 118 min.

The area

The counties it named.

The facts

Issued: Oct 7, 2021, 9:47 AM EDT (13:47 UTC)
Expired: Oct 7, 2021, 11:45 AM EDT
In force: 118 min
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 13:48 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, 1.8 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-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: 134 J/kg
Mixed-layer CIN: -93 J/kg
Mixed-layer LCL: 660 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 70 m²/s²
0-3 km storm-relative helicity: 102 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood 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 areal flood advisory went out at Oct 7, 6:25 AM EDT, 3 hours 22 minutes earlier.

Area forecast discussion, Oct 7, 6:25 AM EDT, 3 hours 22 minutes before

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Hazardous weather outlook, Oct 7, 3:23 AM EDT, 6 hours 24 minutes before

Hazardous Weather Outlook
National Weather Service Columbia SC
323 AM EDT Thu Oct 7 2021

GAZ040-063>065-077-SCZ016-018-020>022-025>031-035-037-038-041-115-
116-135>137-080730-
Lincoln-McDuffie-Columbia-Richmond-Burke-Chesterfield-McCormick-
Newberry-Fairfield-Kershaw-Edgefield-Saluda-Lexington-Richland-Lee-
Aiken-Sumter-Barnwell-Calhoun-Clarendon-Bamberg-Northern Lancaster-
Southern Lancaster-Northwestern Orangeburg-Central Orangeburg-
Southeastern Orangeburg-
323 AM EDT Thu Oct 7 2021

This Hazardous Weather Outlook is for the Midlands of South Carolina
and the Central Savannah River area of Georgia.

.DAY ONE...Today and tonight.

The probability for widespread hazardous weather is low.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 7, 9:59 AM EDT	Special Weather Statement	CAE	McCormick	46 min
Oct 7, 11:09 AM EDT	Areal Flood Advisory	CAE	Edgefield, McCormick	4 hr
Oct 7, 12:30 PM EDT	Areal Flood Advisory	CAE	Edgefield	2 hr

Nearby

Areal Flood Advisories in South Carolina, 2021 Areal Flood Advisories in Georgia, 2021 Every areal flood advisory in 2021

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.