Alert archive / Georgia / Flash Flood Warnings in 2014

Flash Flood Warning 4, NWS Atlanta, GA

April 29, 20145 counties in Georgia

NWS Atlanta, GA issued this flash flood warning at Apr 29, 2014, 3:34 AM EDT for 5 counties in 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: Apr 29, 2014, 3:34 AM EDT (07:34 UTC)
Expired: Apr 29, 2014, 9:30 AM EDT
In force: 6 hr
Issued by: NWS Atlanta, GA
Area: Storm-based polygon
Flood severity: None

Counties Catoosa County, GA, Chattooga County, GA, Dade County, GA, Walker County, GA, Whitfield County, GA

The radar

The Northeast Alabama radar (KHTX), 84 km from the middle of the area, began a volume at 07:37 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
Apr 29, 4:45 AM EDT	FLASH FLOOD	1 Sse Cedar Grove, GA	SEVERAL SMALL STREAMS AND BRANCHES IN THE UPPER REACH OF THE WEST CHICKAMAUGA CREEK BASIN OVERFLOWED THEIR BANKS AND COVER SOME ROADS UP TO ONE FOOT DEEP. SOME MINOR EROSION DAMAGE OCCURRED.

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 00:00Z, 7.6 hours before the alert went out and 159 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: 1978 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 1007 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 175 m²/s²
0-3 km storm-relative helicity: 250 m²/s²
Significant tornado parameter: 2.7
Supercell composite: 13.0

Open this sounding in Storm Lab

The text

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

393 
WGUS52 KFFC 290734
FFWFFC
GAC047-055-083-295-313-291330-
/O.NEW.KFFC.FF.W.0004.140429T0734Z-140429T1330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
334 AM EDT TUE APR 29 2014

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CATOOSA COUNTY IN NORTHWEST GEORGIA
  NORTHERN CHATTOOGA COUNTY IN NORTHWEST GEORGIA
  SOUTHERN DADE COUNTY IN NORTHWEST GEORGIA
  WALKER COUNTY IN NORTHWEST GEORGIA
  WHITFIELD COUNTY IN NORTHWEST GEORGIA

* UNTIL 930 AM EDT

* AT 328 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  POTENTIAL FLASH FLOODING FROM THUNDERSTORMS WITH HEAVY RAIN OVER   
  THE WARNED AREA. RAINFALL AMOUNTS UP TO 3 INCHES HAVE OCCURRED     
  SINCE 10 PM EDT...AND ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES 
  ARE EXPECTED THROUGH SUNRISE.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO DALTON...
  TUNNEL HILL...VARNELL...COHUTTA...RINGGOLD...FORT OGLETHORPE...    
  LAFAYETTE...CHICKAMAUGA AND LOOKOUT MOUNTAIN. THESE RAINFALL       
  AMOUNTS WILL RESULT IN RISES OF AREA CREEKS AND                    
  RIVERS...INCLUDING THOSE IN THE LOOKOUT CREEK...CONASAUGA          
  RIVER...WEST CHICKAMAUGA CREEK AND CHICKAMAUGA BASINS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE 
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE 
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS 
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

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 3459 8508 3458 8511 3447 8517 3442 8549
      3478 8558 3499 8537 3499 8482

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 28, 8:58 PM EDT	Special Weather Statement	FFC	Murray	17 min
Apr 28, 9:29 PM EDT	Tornado Warning	FFC	Dade	31 min
Apr 28, 11:15 PM EDT	Special Weather Statement	FFC	Chattooga, Walker	45 min
Apr 28, 11:18 PM EDT	Special Weather Statement	FFC	Catoosa	27 min
Apr 29, 2:29 AM EDT	Severe Thunderstorm Warning	FFC	Chattooga, Dade, Walker	46 min
Apr 29, 3:09 AM EDT	Special Weather Statement	FFC	Carroll	51 min
Apr 29, 3:24 AM EDT	Severe Thunderstorm Warning	FFC	Chattooga, Dade, Walker	51 min
Apr 29, 4:06 AM EDT	Special Weather Statement	FFC	Catoosa, Whitfield	24 min
Apr 29, 4:10 AM EDT	Special Weather Statement	FFC	Heard	50 min
Apr 29, 4:30 AM EDT	Special Weather Statement	FFC	Chattahoochee, Harris, Muscogee	60 min
Apr 29, 5:01 AM EDT	Severe Thunderstorm Warning	FFC	Harris, Muscogee	44 min
Apr 29, 5:03 AM EDT	Tornado Warning	FFC	Harris, Muscogee	42 min
Apr 29, 6:09 AM EDT	Special Weather Statement	FFC	Stewart, Sumter, Webster	51 min
Apr 29, 7:03 AM EDT	Special Weather Statement	FFC	Crisp, Dooly, Houston, Macon, Peach, Pulaski and 1 more	57 min
Apr 29, 7:22 AM EDT	Special Weather Statement	FFC	Gilmer, Pickens	68 min
Apr 29, 8:03 AM EDT	Special Weather Statement	FFC	Crisp, Dooly, Pulaski, Sumter, Wilcox	57 min
Apr 29, 9:04 AM EDT	Special Weather Statement	FFC	Dodge, Laurens, Wilcox	56 min
Apr 29, 9:15 AM EDT	Severe Thunderstorm Warning	FFC	Bleckley, Dodge, Pulaski	30 min

Nearby

Flash Flood Warnings in Georgia, 2014 Every flash flood warning in 2014

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.