Alert archive / Georgia / Flash Flood Warnings in 2013

Flash Flood Warning 93, NWS Atlanta, GA

August 21, 2013White County, Georgia

NWS Atlanta, GA issued this flash flood warning at Aug 21, 2013, 12:10 PM EDT for White County, Georgia. It was in force for 6 hr. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 21, 2013, 12:10 PM EDT (16:10 UTC)
Expired: Aug 21, 2013, 6:00 PM EDT
In force: 6 hr
Issued by: NWS Atlanta, GA
Area: Storm-based polygon
Flood severity: None

County White County, GA

The radar

The Greer radar (KGSP), 141 km from the middle of the area, began a volume at 16:12 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.

What was reported inside it

Time	Report	Where	Remark
Aug 21, 1:00 PM EDT	FLASH FLOOD	Cleveland, GA	A FEW RAPID RESPONDING CREEKS IN THE CLEVELAND AREA CAME OUT OF THEIR BANKS AND OVERFLOWED PORTIONS OF SOME ROADS. THE ROADS WERE CLOSED FOR AROUND TWO HOURS.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 4.2 hours before the alert went out and 161 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: 873 J/kg
Mixed-layer CIN: -38 J/kg
Mixed-layer LCL: 589 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 116 m²/s²
0-3 km storm-relative helicity: 118 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.

931 
WGUS52 KFFC 211610
FFWFFC
GAC311-212200-
/O.NEW.KFFC.FF.W.0093.130821T1610Z-130821T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
1210 PM EDT WED AUG 21 2013

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WHITE COUNTY IN NORTHEAST GEORGIA

* UNTIL 600 PM EDT

* AT 1204 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED  
  THAT TWO TO THREE INCHES OF RAIN HAS FALLEN ACROSS WHITE COUNTY    
  THIS MORNING. MODERATE TO LOCALLY HEAVY RAINFALL WILL CONTINUE     
  ACROSS THE COUNTY FOR THE REMAINDER OF THE AFTERNOON WITH ANOTHER  
  ONE TO ONE AND HALF INCHES POSSIBLE. ADDITIONAL RAINS ON TOP OF    
  ALREADY SATURATED SOILS WILL PRODUCE RUN OFF. STORMS WILL MOVE     
  NORTH AT AROUND 10 MPH.   

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO            
  HELEN...CLEVELAND...ANNA RUBY FALLS...SAUTEE...LEAF...MOSSY        
  CREEK...LOW GAP SHELTER AND UNICOI STATE PARK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY...THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

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 3477 8363 3475 8362 3466 8365 3454 8361
      3451 8366 3451 8384 3453 8383 3456 8387
      3468 8387 3472 8386 3473 8383 3478 8382
      3480 8376 3480 8368

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 20, 8:13 PM EDT	Special Weather Statement	FFC	Chattahoochee, Macon, Marion, Muscogee, Schley, Talbot and 1 more	47 min
Aug 20, 8:24 PM EDT	Special Weather Statement	FFC	Crisp	36 min
Aug 20, 8:39 PM EDT	Severe Thunderstorm Warning	FFC	Crisp, Wilcox	51 min
Aug 20, 8:55 PM EDT	Severe Thunderstorm Warning	FFC	Dooly, Pulaski, Wilcox	50 min
Aug 20, 9:00 PM EDT	Special Weather Statement	FFC	Macon, Talbot, Taylor	30 min
Aug 20, 9:33 PM EDT	Flash Flood Warning	FFC	Crisp, Dooly, Wilcox	6 hr
Aug 20, 9:52 PM EDT	Special Weather Statement	FFC	Crawford, Houston, Peach, Upson	53 min
Aug 20, 11:03 PM EDT	Special Weather Statement	FFC	Dodge	42 min
Aug 20, 11:37 PM EDT	Special Weather Statement	FFC	Laurens, Wheeler	38 min
Aug 20, 11:51 PM EDT	Special Weather Statement	FFC	Newton, Rockdale	24 min
Aug 21, 12:20 AM EDT	Special Weather Statement	FFC	Laurens	40 min
Aug 21, 4:07 AM EDT	Flash Flood Watch	FFC	Baldwin, Bibb, Bleckley, Chattahoochee, Crawford, Crisp and 29 more	17 hr
Aug 21, 9:26 AM EDT	Special Weather Statement	FFC	Rockdale	64 min
Aug 21, 10:06 AM EDT	Special Weather Statement	FFC	Rockdale	54 min
Aug 21, 11:17 AM EDT	Special Weather Statement	FFC	DeKalb	58 min
Aug 21, 11:51 AM EDT	Flash Flood Warning	FFC	DeKalb	6 hr
Aug 21, 1:24 PM EDT	Special Weather Statement	FFC	Polk	36 min
Aug 21, 3:47 PM EDT	Special Weather Statement	FFC	Telfair, Wheeler	28 min
Aug 21, 4:42 PM EDT	Special Weather Statement	FFC	Chattooga, Dade, Walker	33 min
Aug 21, 4:57 PM EDT	Severe Thunderstorm Warning	FFC	Oglethorpe, Wilkes	48 min
Aug 21, 5:58 PM EDT	Special Weather Statement	FFC	Polk	32 min
Aug 21, 6:22 PM EDT	Special Weather Statement	FFC	Haralson	38 min
Aug 21, 6:58 PM EDT	Special Weather Statement	FFC	Monroe	32 min

Nearby

Flash Flood Warnings in Georgia, 2013 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.