Alert archive / Georgia / Areal Flood Advisories in 2021

Areal Flood Advisory 2, NWS Greenville-Spartanburg, SC

January 1, 2021Rabun County, Georgia

NWS Greenville-Spartanburg, SC issued this areal flood advisory at Jan 1, 2021, 4:17 PM EST for Rabun County, Georgia. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued: Jan 1, 2021, 4:17 PM EST (21:17 UTC)
Expired: Jan 1, 2021, 6:21 PM EST
In force: 2 hr
Issued by: NWS Greenville-Spartanburg, SC
Area: Storm-based polygon

County Rabun County, GA

The radar

The Greer radar (KGSP), 108 km from the middle of the area, began a volume at 21:18 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, 9.3 hours before the alert went out and 196 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: 7 J/kg
Mixed-layer CIN: -202 J/kg
Mixed-layer LCL: 573 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 389 m²/s²
0-3 km storm-relative helicity: 491 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 areal flood advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Greenville-Spartanburg, SC wrote its last area forecast discussion before this areal flood advisory went out at Jan 1, 4:04 PM EST, 13 minutes earlier.

Area forecast discussion, Jan 1, 4:04 PM EST, 13 minutes before

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Hazardous weather outlook, Jan 1, 3:35 PM EST, 42 minutes before

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In the hours before

Special weather statement, Jan 1, 1:02 PM EST, 3 hours 15 minutes before

Special Weather Statement
National Weather Service Greenville-Spartanburg SC
102 PM EST Fri Jan 1 2021

GAZ026-028-029-NCZ065-508>510-SCZ002>008-010>012-011915-
Elbert GA-Hart GA-Franklin GA-Eastern Polk NC-Greater Rutherford NC-
Henderson NC-Polk Mountains NC-Greater Pickens SC-Cherokee SC-
Greater Oconee SC-Laurens SC-Abbeville SC-Pickens Mountains SC-
Anderson SC-Greenville Mountains SC-Spartanburg SC-
Greater Greenville SC-
102 PM EST Fri Jan 1 2021

...AN AREA OF HEAVY RAIN WITH EMBEDDED THUNDERSTORMS WILL IMPACT
HART...SOUTHEASTERN FRANKLIN... ELBERT...SOUTHEASTERN
RUTHERFORD...SOUTHEASTERN HENDERSON...POLK... NORTHWESTERN
LAURENS...EASTERN PICKENS...SOUTHEASTERN OCONEE...
GREENVILLE...NORTHWESTERN SPARTANBURG...ANDERSON...NORTHWESTERN
CHEROKEE AND CENTRAL ABBEVILLE COUNTIES UNTIL 215 PM EST...

At 100 PM EST, Doppler radar indicated the leading edge of an area
of heavy rain with embedded thunderstorms along a line extending
from 7 miles southwest of Columbus to 6 miles southwest of
Danielsville, and moving northeast at 30 mph.

Locations to be impacted include...
Greenville Downtown, Anderson, Easley, Clemson, Elberton, Hartwell,
Columbus, Spartanburg, Greenville Eastside and West Greenville.

Very heavy rainfall rates of 1 to 2 inches per hour will be possible
in these areas.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall may flood areas with poor drainage, such as
ditches and underpasses. Avoid these areas and do not cross flooded
roads. Water levels of small streams may also rise rapidly. Seek
higher ground if threatened by flood waters.

&&

LAT...LON 3401 8294 3403 8294 3404 8298 3410 8304
      3411 8303 3415 8306 3417 8310 3423 8308
      3427 8311 3424 8317 3424 8319 3531 8234
      3528 8174 3514 8179 3402 8263 3400 8289
TIME...MOT...LOC 1800Z 247DEG 31KT 3518 8231 3405 8329

KRENTZ

Special weather statement, Jan 1, 2:12 PM EST, 2 hours 5 minutes before

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Special weather statement, Jan 1, 3:37 PM EST, 40 minutes before

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Special weather statement, Jan 1, 4:09 PM EST, 8 minutes before

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The office that day

Everything else NWS Greenville-Spartanburg, SC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 31, 10:03 PM EST	Dense Fog Advisory	GSP	Alexander, Burke, Cabarrus, Caldwell, Catawba, Cleveland and 10 more	9 hr
Jan 1, 11:56 AM EST	Areal Flood Advisory	GSP	Henderson, Jackson, Transylvania	5 hr
Jan 1, 1:02 PM EST	Special Weather Statement	GSP	Polk	73 min
Jan 1, 3:37 PM EST	Special Weather Statement	GSP	Catawba, Cleveland, Gaston, Lincoln, Polk, Rutherford	53 min
Jan 1, 4:43 PM EST	Areal Flood Advisory	GSP	Transylvania	3 hr
Jan 1, 4:51 PM EST	Special Weather Statement	GSP	Cleveland, Gaston	39 min
Jan 1, 5:30 PM EST	Special Weather Statement	GSP	Cabarrus, Gaston, Mecklenburg, Rowan	60 min
Jan 1, 6:24 PM EST	Special Weather Statement	GSP	Union	51 min
Jan 1, 2:12 PM EST	Special Weather Statement	GSP	Abbeville, Anderson, Cherokee, Greenville, Greenwood, Laurens and 1 more	63 min
Jan 1, 4:09 PM EST	Special Weather Statement	GSP	Greenwood, Laurens	51 min
Jan 1, 4:33 PM EST	Areal Flood Advisory	GSP	Greenville, Pickens	3 hr
Jan 1, 5:02 PM EST	Special Weather Statement	GSP	Greenwood	58 min
Jan 1, 5:12 PM EST	Areal Flood Advisory	GSP	Greenwood	3 hr

Nearby

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.