Alert archive / Georgia / Areal Flood Advisories in 2021

Areal Flood Advisory 101, NWS Greenville-Spartanburg, SC

August 18, 2021Rabun County, Georgia

NWS Greenville-Spartanburg, SC issued this areal flood advisory at Aug 18, 2021, 3:52 PM EDT for Rabun County, Georgia. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued: Aug 18, 2021, 3:52 PM EDT (19:52 UTC)
Expired: Aug 18, 2021, 7:45 PM EDT
In force: 4 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 19:55 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

Nashville Metro, TN (KBNA), launched 12:00Z, 7.9 hours before the alert went out and 321 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: 259 J/kg
Mixed-layer CIN: -49 J/kg
Mixed-layer LCL: 919 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 70 m²/s²
0-3 km storm-relative helicity: 72 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 Aug 18, 3:00 PM EDT, 52 minutes earlier.

Area forecast discussion, Aug 18, 3:00 PM EDT, 52 minutes before

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Hazardous weather outlook, Aug 18, 12:31 PM EDT, 3 hours 21 minutes before

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In the hours before

Local storm report, Aug 18, 11:59 AM EDT, 3 hours 53 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
Aug 17, 8:30 PM EDT	Flash Flood Warning EmergencyCatastrophic damage threat	GSP	Haywood	6 hr
Aug 17, 8:55 PM EDT	Areal Flood Warning	GSP	Mitchell, Yancey	6 hr
Aug 17, 9:01 PM EDT	Areal Flood Advisory	GSP	Burke, Cleveland, Rutherford	5 hr
Aug 17, 9:40 PM EDT	Areal Flood Advisory	GSP	Alexander, Caldwell, Catawba, Gaston, Lincoln	6 hr
Aug 17, 9:52 PM EDT	Areal Flood Warning	GSP	Henderson, Transylvania	14 hr
Aug 17, 10:03 PM EDT	Areal Flood Advisory	GSP	Macon, Swain	11 hr
Aug 17, 10:21 PM EDT	Flash Flood Warning	GSP	Catawba	3 hr
Aug 17, 10:33 PM EDT	Areal Flood Warning	GSP	Buncombe	7 hr
Aug 17, 10:44 PM EDT	Tornado Warning	GSP	Alexander, Iredell	31 min
Aug 17, 10:53 PM EDT	Areal Flood Advisory	GSP	Iredell, Mecklenburg	4 hr
Aug 17, 11:16 PM EDT	River Flood Warning	GSP	Madison	20 hr
Aug 18, 12:00 AM EDT	River Flood Advisory	GSP	Swain	10 hr
Aug 18, 12:44 AM EDT	Areal Flood Warning	GSP	Rutherford	5 hr
Aug 18, 1:18 AM EDT	Areal Flood Advisory	GSP	McDowell	4 hr
Aug 18, 1:59 AM EDT	Areal Flood Advisory	GSP	Avery	3 hr
Aug 18, 2:21 AM EDT	Areal Flood Warning	GSP	Burke, Caldwell	6 hr
Aug 18, 3:15 AM EDT	River Flood Warning	GSP	Buncombe, Henderson	44 hr
Aug 18, 1:28 PM EDT	River Flood Warning	GSP	Henderson, Transylvania	69 hr
Aug 17, 8:00 PM EDT	Tornado Warning	GSP	Cherokee, Spartanburg, Union, York	45 min
Aug 17, 10:11 PM EDT	Areal Flood Advisory	GSP	Habersham	5 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.