Alert archive / Georgia / Flash Flood Warnings in 2013

Flash Flood Warning 99, NWS Atlanta, GA

September 1, 2013Gilmer County, Georgia

NWS Atlanta, GA issued this flash flood warning at Sep 1, 2013, 7:42 AM EDT for Gilmer County, Georgia. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Sep 1, 2013, 7:42 AM EDT (11:42 UTC)
Expired
Sep 1, 2013, 1:45 PM EDT
In force
6 hr
Issued by
NWS Atlanta, GA
Area
Storm-based polygon
Flood severity
None

County Gilmer County, GA

The radar

The Atlanta radar (KFFC), 146 km from the middle of the area, began a volume at 11:43 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 00:00Z, 11.7 hours before the alert went out and 145 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-pSkew-T log-p diagram, Peachtre/Fal Fld, GA at 00:00Z on 2013-09-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2887 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Peachtre/Fal Fld, GA at 00:00Z on 2013-09-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 31 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
2887 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
902 m above ground
0-6 km bulk shear
8 kt
0-1 km storm-relative helicity
31 m²/s²
0-3 km storm-relative helicity
62 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

476 
WGUS52 KFFC 011142
FFWFFC
GAC123-011745-
/O.NEW.KFFC.FF.W.0099.130901T1142Z-130901T1745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
742 AM EDT SUN SEP 1 2013

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  GILMER COUNTY IN NORTH CENTRAL GEORGIA

* UNTIL 145 PM EDT SUNDAY

* AT 737 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM OVER THE WARNED AREA. FLASH
  FLOODING CAN BE EXPECTED AS A RESULT.

* RAINFALL AMOUNTS BETWEEN 2 AND 3 INCHES HAVE FALLEN ACROSS PORTIONS
  OF GILMER COUNTY SINCE 4 AM. ADDITIONAL THUNDERSTORMS HAVE DEVELOPED
  TO THE WEST...WHICH WILL BE MOVING EAST INTO GILMER COUNTY OVER THE
  NEXT FEW HOURS. ADDITIONAL RAINFALL AMOUNTS OF BETWEEN 1 AND 3
  INCHES WILL BE POSSIBLE AS THESE STORMS MOVE OVER THE AREA. 
  LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO PISGAH...
  CHERRY LOG AND MOUNTAINTOWN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN HILLY TERRAIN THERE ARE LOW WATER CROSSINGS WHICH ARE POTENTIALLY
DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO TRAVEL ACROSS FLOODED
ROADS...FIND ALTERNATE ROUTES. IT ONLY TAKES A FEW INCHES OF SWIFTLY
FLOWING WATER TO CARRY VEHICLES AWAY.

IF YOU SEE SIGNIFICANT FLOODING CALL THE NATIONAL WEATHER SERVICE
TOLL FREE AT 1 8 6 6 7 6 3 4 4 6 6. YOU CAN ALSO TWEET YOUR REPORT
USING HASHTAG GAWX.

&&

LAT...LON 3484 8438 3480 8431 3473 8426 3467 8425
      3463 8419 3460 8425 3457 8426 3458 8433
      3455 8437 3455 8446 3456 8447 3455 8448
      3456 8450 3455 8465 3474 8465 3478 8464
      3482 8459 3485 8461

$$
2 follow-up statements
898 
WGUS72 KFFC 011326
FFSFFC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
926 AM EDT SUN SEP 1 2013

GAC123-011745-
/O.CON.KFFC.FF.W.0099.000000T0000Z-130901T1745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GILMER GA-
926 AM EDT SUN SEP 1 2013

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 145 PM EDT FOR
GILMER COUNTY...

AT 924 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A THUNDERSTORMS PRODUCING VERY HEAVY RAIN OVER GILMER 
COUNTY. DOPPLER RADAR ESTIMATES THAT BETWEEN 4 AND 5 INCHES HAS 
FALLEN OVER THE PAST SEVERAL HOURS ACROSS NORTHERN GILMER COUNTY 
NEAR THE COMMUNITY OF CHERRY LOG.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO EAST ELLIJAY
AND ELLIJAY

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS...STREAMS AND COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

IF YOU SEE SIGNIFICANT FLOODING CALL THE NATIONAL WEATHER SERVICE
TOLL FREE AT 1 8 6 6 7 6 3 4 4 6 6. YOU CAN ALSO TWEET YOUR REPORT
USING HASHTAG GAWX.

&&

LAT...LON 3484 8438 3480 8431 3473 8426 3467 8425
      3463 8419 3460 8425 3457 8426 3458 8433
      3455 8437 3455 8446 3456 8447 3455 8448
      3456 8450 3455 8465 3474 8465 3478 8464
      3482 8459 3485 8461

$$
30
643 
WGUS72 KFFC 011701
FFSFFC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
101 PM EDT SUN SEP 1 2013

GAC123-011711-
/O.CAN.KFFC.FF.W.0099.000000T0000Z-130901T1745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GILMER GA-
101 PM EDT SUN SEP 1 2013

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR GILMER COUNTY...

IF YOU SEE SIGNIFICANT FLOODING CALL THE NATIONAL WEATHER SERVICE
TOLL FREE AT 1 8 6 6 7 6 3 4 4 6 6. YOU CAN ALSO TWEET YOUR REPORT
USING HASHTAG GAWX.

LAT...LON 3484 8438 3480 8431 3473 8426 3467 8425
      3463 8419 3460 8425 3457 8426 3458 8433
      3455 8437 3455 8446 3456 8447 3455 8448
      3456 8450 3455 8465 3474 8465 3478 8464
      3482 8459 3485 8461

$$
30

The office that day

Everything else NWS Atlanta, GA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 31, 9:09 PM EDTSpecial Weather StatementFFCMurray51 min
Aug 31, 9:58 PM EDTFlash Flood WarningFFCMurray6 hr
Aug 31, 10:03 PM EDTSpecial Weather StatementFFCTowns57 min
Sep 1, 5:50 AM EDTSpecial Weather StatementFFCGilmer, Murray, Pickens40 min
Sep 1, 6:37 AM EDTSpecial Weather StatementFFCGilmer, Pickens38 min
Sep 1, 12:20 PM EDTSpecial Weather StatementFFCGordon, Pickens40 min
Sep 1, 12:50 PM EDTSpecial Weather StatementFFCFulton, Gwinnett40 min
Sep 1, 12:59 PM EDTSpecial Weather StatementFFCClarke, Madison46 min
Sep 1, 1:06 PM EDTSpecial Weather StatementFFCBartow, Polk39 min
Sep 1, 1:33 PM EDTSpecial Weather StatementFFCDeKalb, Douglas, Fulton, Gwinnett, Walton42 min
Sep 1, 1:38 PM EDTSpecial Weather StatementFFCHaralson, Paulding, Polk52 min
Sep 1, 1:49 PM EDTSevere Thunderstorm WarningFFCCobb, Douglas, Paulding41 min
Sep 1, 1:54 PM EDTSpecial Weather StatementFFCClarke, Oconee, Oglethorpe36 min
Sep 1, 2:31 PM EDTSpecial Weather StatementFFCCarroll, Douglas, Haralson29 min
Sep 1, 2:34 PM EDTSpecial Weather StatementFFCCobb, DeKalb, Fulton41 min
Sep 1, 2:52 PM EDTSpecial Weather StatementFFCClayton, Henry, Newton, Rockdale23 min
Sep 1, 3:02 PM EDTSpecial Weather StatementFFCCarroll, Douglas43 min
Sep 1, 3:32 PM EDTSpecial Weather StatementFFCCatoosa43 min
Sep 1, 3:40 PM EDTSpecial Weather StatementFFCButts50 min
Sep 1, 3:46 PM EDTSpecial Weather StatementFFCCarroll, Heard44 min
Sep 1, 4:09 PM EDTSpecial Weather StatementFFCFayette, Meriwether51 min
Sep 1, 4:15 PM EDTSpecial Weather StatementFFCCatoosa, Murray, Whitfield45 min
Sep 1, 4:31 PM EDTSevere Thunderstorm WarningFFCCatoosa, Murray, Whitfield44 min
Sep 1, 5:07 PM EDTSpecial Weather StatementFFCLamar, Monroe23 min
Sep 1, 5:13 PM EDTSpecial Weather StatementFFCUpson47 min
Sep 1, 5:16 PM EDTSpecial Weather StatementFFCGordon44 min
Sep 1, 5:50 PM EDTSpecial Weather StatementFFCBibb40 min
Sep 1, 6:12 PM EDTSpecial Weather StatementFFCMuscogee48 min
Sep 1, 6:31 PM EDTSpecial Weather StatementFFCCrawford, Macon, Taylor44 min
Sep 1, 7:02 PM EDTSpecial Weather StatementFFCGlascock28 min
Sep 1, 7:28 PM EDTSpecial Weather StatementFFCGlascock, Warren47 min

Nearby

Flash Flood Warnings in Georgia, 2013Every flash flood warning in 2013

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.