Alert archive / Georgia / Flash Flood Warnings in 1992

Flash Flood Warning 6, NWS Atlanta, GA

August 21, 1992Rockdale County, Georgia

NWS Atlanta, GA issued this flash flood warning at Aug 21, 1992, 9:04 PM EDT for Rockdale County, Georgia. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Aug 21, 1992, 9:04 PM EDT (01:04 UTC)
Expired
Aug 22, 1992, 12:00 AM EDT
In force
3 hr
Issued by
NWS Atlanta, GA
Area
Whole counties

County Rockdale County, GA

The nearest sounding before it

Athens Municipal, GA (KAHN), launched 00:00Z, 1.1 hours before the alert went out and 75 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, Athens Municipal, GA at 00:00Z on 1992-08-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 299 joules per kilogram.LCLLFCEL10008507005003002001001 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, Athens Municipal, GA at 00:00Z on 1992-08-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 107 square meters per square second.193958Sfc1 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
299 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
632 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
107 m²/s²
0-3 km storm-relative helicity
167 m²/s²
Significant tornado parameter
0.1
Supercell composite
2.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KATL 220107
FFWATL
GAC247-220400-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ATLANTA  GA
904 PM EDT FRI AUG 21 1992
 
THE NATIONAL WEATHER SERVICE IN ATLANTA  HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL MIDNIGHT EDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN NORTHWEST GEORGIA
 
   ...ROCKDALE COUNTY
 
AT 9:00 PM EDT NATIONAL WEATHER SERVICE RADAR INDICATED VERY HEAVY
RAINFALL WAS CONTINUING TO FALL OVER NORTHWEST GEORGIA. SOME OF THE
HEAVIER RAINFALL AND THUNDERSTORMS HAVE LINGERED OVER ROCKDALE COUNTY
FOR THE LAST COUPLE OF HOURS. THEREFORE...STREAMS AND CREEKS IN THE
COUNTY WERE AT BANKFULL OR OVERFLOWING. ACCORDING TO OFFICIALS IN
ROCKDALE COUNTY...SEVERAL ROADS IN THE AREA WERE IMPASSABLE.
 
HEAVY RAINFALL WILL PERSIST THROUGH THE EARLY PART OF THE NIGHT.
REIDENTS SHOULD BE PREPARED TO TAKE PRECAUTIONS IF NECESSARY.
 
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE
THE DANGERS OF 4FLOODS AND FLASH FLOODS.  IF FLASH FLOODING IS
OBSERVED...ACT QUICKLY.  MOVE UP TO ESCAPE FLOOD WATERS.  DO
NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Aug 21, 4:14 PM EDT, 4 hours 50 minutes before
GAZ003-222200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ATLANTA  GA
410 PM EDT FRI AUG 21 1992

...THUNDERSHOWERS OVER NORTHWEST GEORGIA WERE PRODUCING LOCALLY HEAVY RAINS..

AT 410 PM EDT WEATHER RADAR INDICATED MOST OF NORTHWEST GEORGIA WAS COVERED
BY AN AREA OF RAIN WITH EMBEDDED THUNDERSHOWERS. REPORTS OF UP TO TWO INCHES
OF RAIN IN ONE HOUR IN COWETA COUNTY HAVE BEEN RECEIVED AT THE WEATHER
SERVICE. THIS RAIN HAS PRODUCED STREAMS NEAR BANKFULL AND LOCALIZED POOLING
OF WATER IN LOW PLACES ON HIGHWAYS...THUS MAKING DRIVING DANGEROUS.

THE RAINFALL IS EXPECTED TO CONTINUE FOR THE REMAINDER OF THIS AFTERNOON
AND INTO THIS EVENING. WITH THE GROUND ALREADY SATURATED ACROSS MUCH OF
NORTHWEST GEORGIA DUE TO THE RAIN OF THE LAST FEW DAYS...STREAMS MAY GO
ABOVE BANK FULL AND SOME LOCALIZED FLOODING MAY OCCUR. PERSONS IN NORTHWEST
GEORGIA SHOULD BE ON THE ALERT FOR PROBLEMS THAT THIS HEAVY RAIN MAY
PRODUCE AND TAKE APPROPRIATE PRCAUTIONS.
Special weather statement, Aug 21, 4:16 PM EDT, 4 hours 48 minutes before
GAZ001-003-222200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ATLANTA  GA
415 PM EDT FRI AUG 21 1992

...THUNDERSHOWERS OVER NORTHWEST GEORGIA WERE PRODUCING LOCALLY HEAVY RAINS..

AT 415 PM EDT WEATHER RADAR INDICATED MOST OF NORTHWEST GEORGIA WAS COVERED
BY AN AREA OF RAIN WITH EMBEDDED THUNDERSHOWERS. REPORTS OF UP TO TWO INCHES
OF RAIN IN ONE HOUR IN COWETA COUNTY HAVE BEEN RECEIVED AT THE WEATHER
SERVICE. THIS RAIN HAS PRODUCED STREAMS NEAR BANKFULL AND LOCALIZED POOLING
OF WATER IN LOW PLACES ON HIGHWAYS...THUS MAKING DRIVING DANGEROUS.

THE RAINFALL IS EXPECTED TO CONTINUE FOR THE REMAINDER OF THIS AFTERNOON
AND INTO THIS EVENING. WITH THE GROUND ALREADY SATURATED ACROSS MUCH OF
NORTHWEST GEORGIA DUE TO THE RAIN OF THE LAST FEW DAYS...STREAMS MAY GO
ABOVE BANK FULL AND SOME LOCALIZED FLOODING MAY OCCUR. PERSONS IN NORTHWEST
GEORGIA SHOULD BE ON THE ALERT FOR PROBLEMS THAT THIS HEAVY RAIN MAY
PRODUCE AND TAKE APPROPRIATE PRCAUTIONS.
Local storm report, Aug 21, 4:47 PM EDT, 4 hours 17 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ATHENS GA
430 PM EDT FRI AUG 21 1992

COUNTY........ RABUN

SOURCE........ UNOFFICAL OBSERVER AND SHERIFFS DEPT.

TIME.......... 2115 EDT THU AUG 20 1992

LOCATION...... EASTERN RABUN COUNTY OF NORTHEAST GEORGIA

TYPE STORM.... STATIONARY THUNDERSTORM

HAIL.......... NONE

DAMAGE........ 4.36 INCHES OF RAINFALL WITHIN 3 HOUR PERIOD.  WATER
COVERED BRIDGE AND APPEARED BRIDGE WASHED AWAY BUT OK AFTER \WATER
SUBSIDED.

INJURIES...... NONE

FLASH FLOOD WARNING IN EFFECT 2130EDT - 0030EDT.
Special weather statement, Aug 21, 6:10 PM EDT, 2 hours 54 minutes before
GAZ001-003-230000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ATLANTA  GA
610 PM EDT FRI AUG 21 1992

...THUNDERSHOWERS OVER NORTHWEST GEORGIA WERE PRODUCING LOCALLY HEAVY RAINS..

AT 610 PM EDT WEATHER RADAR INDICATED MOST OF NORTH GEORGIA WAS COVERED
BY AN AREA OF HEAVY RAIN WITH EMBEDDED THUNDERSTORMS. OVER TWO INCHES OF
RAIN HAD FALLEN IN SEVERAL LOCATIONS. SEVERAL COUNTIES OF METROPOLITAN
ATLANTA HAD STREETS AND ROADS FLOODED. IN ADDITION...AUTHORITIES IN COBB
COUNTY REPORTED THAT A FEW HOMES WERE FLOODING.

THE RAINFALL WILL CONTINUE THROUGH THIS EVENING AND WILL AT TIMES BE
HEAVY. OVER NORTHWEST GEORGIA...THE GROUND WAS ALREADY SATURATED AFTER
THE PREVIOS RAIN OF THE LAST FEW DAYS. AREA STREAMS AND CREEKS WERE
APPROACHING BANKFULL AT 610 PM EDT. FLOODING CONDITIONS COULD DEVELOP
RAPIDLY WITH ADDITIONAL RAINFALL OVER LOW-LYING AREAS. RESIDENTS AND
MOTORISTS SHOULD BE ALERT FOR POSSIBLE FLOODING. LISTEN TO LOCAL TV AND
RADIO STATIONS OR NOAA WEATHER RADIO FOR UPDATES ON THIS SITUATION.

Nearby

Flash Flood Warnings in Georgia, 1992Every flash flood warning in 1992

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.