Alert archive / Georgia / Flash Flood Watches in 2011

Flash Flood Watch 3, NWS Atlanta, GA

November 28, 2011Towns County, Union County, White County, Georgia

NWS Atlanta, GA issued this flash flood watch at Nov 28, 2011, 4:23 PM EST for Towns County, Union County, White County, Georgia. It was in force for 5 hr.

The area

The counties it named.

The facts

Issued
Nov 28, 2011, 4:23 PM EST (21:23 UTC)
Expired
Nov 28, 2011, 9:03 PM EST
In force
5 hr
Issued by
NWS Atlanta, GA

Counties Towns County, GA, Union County, GA, White County, GA

The radar

The Greer radar (KGSP), 147 km from the middle of the area, began a volume at 21:25 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, 9.4 hours before the alert went out and 171 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 12:00Z on 2011-11-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 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 12:00Z on 2011-11-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 382 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
477 m above ground
0-6 km bulk shear
65 kt
0-1 km storm-relative helicity
382 m²/s²
0-3 km storm-relative helicity
432 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.

842 
WGUS62 KFFC 282123
FFAFFC

URGENT - IMMEDIATE BROADCAST REQUESTED
FLOOD WATCH
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
423 PM EST MON NOV 28 2011

GAZ008-009-016-290530-
/O.CAN.KFFC.FA.A.0004.000000T0000Z-111129T1000Z/
/O.NEW.KFFC.FF.A.0003.111128T2123Z-111129T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
UNION-TOWNS-WHITE-
INCLUDING THE CITY OF...CLEVELAND
423 PM EST MON NOV 28 2011

...FLOOD WATCH REMAINS IN EFFECT THROUGH LATE TONIGHT FOR
TOWNS... UNION... AND WHITE COUNTIES IN NORTHEAST GEORGIA...

...FLOOD WATCH IS CANCELLED FOR ALL OTHER COUNTIES EXCEPT TOWNS...
UNION... AND WHITE COUNTIES...

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS CONTINUED THE 

* FLOOD WATCH FOR PORTIONS OF NORTHEAST GEORGIA.

* THROUGH 5 AM TONIGHT

* LIGHT TO MODERATE RAIN CONTINUES OVER PARTS OF NORTHEAST AND
  EAST CENTRAL GEORGIA THIS EVENING AS A LOW PRESSURE SYSTEM
  CENTERED OVER EASTERN TENNESSEE AND KENTUCKY IS SLOW TO DRIFT
  EASTWARD. 

* RAINFALL AMOUNTS OF ONE HALF TO NEAR ONE INCH REMAIN POSSIBLE
  OVER FAR NORTHEAST GEORGIA THROUGH THE EVENING AND EARLY TUESDAY
  MORNING HOURS. THIS OVER AN ALREADY SATURATED GROUND WILL
  CONTINUE THE FLOOD THREAT INTO EARLY TUESDAY MORNING FOR PARTS
  OF NORTHEAST GEORGIA. ALTHOUGH THE RAIN IS EXPECTED TO GRADUALLY
  END FROM THE WEST DURING THE EVENING HOURS... RUNOFF INTO
  ALREADY SWOLLEN CREEKS AND STREAMS WILL CONTINUE OVERNIGHT.

* MINOR FLOODING IS ALREADY OCCURRING IN MANY LOCATIONS ACROSS
  NORTH GEORGIA...SUCH AS LOOKOUT CREEK NEAR TRENTON... WEST AND
  SOUTH CHICKAMAUGA CREEKS IN WALKER AND CATOOSA COUNTIES... AND
  THE CONASAUGA RIVER AND COAHULLA CREEK IN WHITFIELD AND MURRAY
  COUNTIES. THE HIWASSEE RIVER IN TOWNS COUNTY IS BEING MONITORED
  CLOSELY FOR POSSIBLE FLOODING AS WELL.

PRECAUTIONARY/PREPAREDNESS ACTIONS... 

A FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO
FLOODING. FLOODING IS A VERY DANGEROUS SITUATION.

YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION
SHOULD FLOOD WARNINGS BE ISSUED.

&&

THE FLOOD WATCH FOR PORTIONS OF NORTHWEST AND NORTH CENTRAL GEORGIA
HAS BEEN CANCELLED.

THE MODERATE RAIN HAS PUSHED EAST AND GREATLY DIMINISHED THE
FLOOD THREAT FOR PARTS OF NORTHWEST AND NORTH CENTRAL GEORGIA FOR
TONIGHT. HOWEVER... ARE RESIDENTS SHOULD CONTINUE TO MONITOR RISES
ON AREA CREEKS AND RIVERS FOR POSSIBLE WARNINGS OR CHANGES IN
CURRENT WARNINGS THAT HAVE BEEN ISSUED. 

$$

GAZ001>007-011>015-019>021-282230-
/O.CAN.KFFC.FA.A.0004.000000T0000Z-111129T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DADE-WALKER-CATOOSA-WHITFIELD-MURRAY-FANNIN-GILMER-CHATTOOGA-
GORDON-PICKENS-DAWSON-LUMPKIN-FLOYD-BARTOW-CHEROKEE-
INCLUDING THE CITIES OF...CALHOUN...DAHLONEGA...ROME...
CARTERSVILLE
423 PM EST MON NOV 28 2011

...FLOOD WATCH IS CANCELLED FOR PORTIONS OF NORTHWEST AND NORTH
CENTRAL GEORGIA...

THE FLOOD WATCH FOR PORTIONS OF NORTHWEST AND NORTH CENTRAL GEORGIA
HAS BEEN CANCELLED.

THE MODERATE RAIN HAS PUSHED EAST AND GREATLY DIMINISHED THE
FLOOD THREAT FOR PARTS OF NORTHWEST AND NORTH CENTRAL GEORGIA FOR
TONIGHT. HOWEVER... ARE RESIDENTS SHOULD CONTINUE TO MONITOR RISES
ON AREA CREEKS AND RIVERS FOR POSSIBLE WARNINGS OR CHANGES IN
CURRENT WARNINGS THAT HAVE BEEN ISSUED. 

$$
1 follow-up statement
773 
WGUS62 KFFC 290203
FFAFFC

FLOOD WATCH
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
903 PM EST MON NOV 28 2011

GAZ008-009-016-290300-
/O.CAN.KFFC.FF.A.0003.000000T0000Z-111129T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
UNION-TOWNS-WHITE-
INCLUDING THE CITY OF...CLEVELAND
853 PM EST MON NOV 28 2011

...FLOOD WATCH IS CANCELLED FOR TOWNS... UNION... AND WHITE
COUNTIES IN NORTHEAST GEORGIA...

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY GEORGIA HAS
CANCELLED THE FLOOD WATCH FOR PORTIONS OF NORTHEAST GEORGIA.

THE MODERATE RAIN HAS PUSHED EAST AND GREATLY DIMINISHED THE
FLOOD THREAT FOR THE WATCH AREA. ALTHOUGH THE HEAVIER RAINS HAVE
ENDED... RESIDENTS SHOULD BE AWARE THAT SLOW RISES ON FLOOD PRONE
CREEKS AND RIVERS ARE POSSIBLE OVERNIGHT.

 
$$

The office that day

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

IssuedProductOfficeCountiesLasted
Nov 28, 1:44 AM ESTRiver Flood WarningFFCDade38 hr
Nov 28, 10:20 AM ESTRiver Flood WarningFFCMurray, Whitfield46 hr
Nov 28, 10:20 AM ESTRiver Flood WarningFFCWhitfield3 days
Nov 28, 10:20 AM ESTRiver Flood WarningFFCGordon, Murray, Whitfield3 days
Nov 28, 10:55 AM ESTRiver Flood WarningFFCCatoosa50 hr
Nov 28, 12:03 PM ESTRiver Flood WarningFFCTowns9 hr
Nov 28, 4:29 PM ESTRiver Flood WarningFFCChattooga20 hr

Nearby

Flash Flood Watches in Georgia, 2011Every flash flood watch in 2011

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.