Alert archive / South Carolina / Areal Flood Advisories in 2021

Areal Flood Advisory 91, NWS Columbia, SC

October 7, 2021Edgefield County, South Carolina

NWS Columbia, SC issued this areal flood advisory at Oct 7, 2021, 12:30 PM EDT for Edgefield County, South Carolina. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued: Oct 7, 2021, 12:30 PM EDT (16:30 UTC)
Expired: Oct 7, 2021, 2:30 PM EDT
In force: 2 hr
Issued by: NWS Columbia, SC
Area: Storm-based polygon

County Edgefield County, SC

The radar

The Columbia radar (KCAE), 81 km from the middle of the area, began a volume at 16:32 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, 4.5 hours before the alert went out and 239 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, 6 hours 5 minutes earlier.

Area forecast discussion, Oct 7, 6:25 AM EDT, 6 hours 5 minutes before

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Hazardous weather outlook, Oct 7, 3:23 AM EDT, 9 hours 7 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.

In the hours before

Special weather statement, Oct 7, 9:59 AM EDT, 2 hours 31 minutes before

Special Weather Statement
National Weather Service Columbia SC
959 AM EDT Thu Oct 7 2021

GAZ040-SCZ018-025-071445-
Lincoln GA-McCormick SC-Edgefield SC-
959 AM EDT Thu Oct 7 2021

...A strong thunderstorm will impact portions of central Lincoln,
northwestern Edgefield and northern McCormick Counties through 1045
AM EDT...

At 958 AM EDT, Doppler radar was tracking a strong thunderstorm near
Elijah Clark State Park, or 19 miles south of Abbeville, moving
northeast at 10 mph.

...Boaters on Lake Strom Thurmond Should Seek Safe Harbor...

HAZARD...Winds 30 to 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
McCormick, Lincolnton, Mccormick County Airport, Elijah Clark State
Park, Plum Branch, Hickory Knob State Resort Park, Bordeaux, Baker
Creek State Park, Leroy's Ferry Recreation Area, Willington, Curry
Hill, Whitetown, Hawe Creek Campground and Long Cane Creek Picnic
Area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3395 8255 3406 8233 3397 8230 3402 8225
      3401 8223 3398 8221 3398 8219 3385 8212
      3378 8252
TIME...MOT...LOC 1358Z 246DEG 10KT 3390 8243

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...30 MPH

awp

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 7, 9:47 AM EDT	Areal Flood Advisory	CAE	McCormick	118 min
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

Nearby

Areal Flood Advisories in South Carolina, 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.