Alert archive / Georgia / Flash Flood Warnings in 2006

Flash Flood Warning 3, NWS Atlanta, GA

March 20, 2006Fulton County, Gwinnett County, Georgia

NWS Atlanta, GA issued this flash flood warning at Mar 20, 2006, 10:44 PM EST for Fulton County, Gwinnett County, Georgia. It was in force for 4 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: Mar 20, 2006, 10:44 PM EST (03:44 UTC)
Expired: Mar 21, 2006, 2:45 AM EST
In force: 4 hr
Issued by: NWS Atlanta, GA
Area: Counties, with a storm outline in the text

Counties Fulton County, GA, Gwinnett County, GA

The radar

The Atlanta radar (KFFC), 79 km from the middle of the area, began a volume at 03:47 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, 3.7 hours before the alert went out and 76 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 770 m above ground
0-6 km bulk shear: 82 kt
0-1 km storm-relative helicity: 520 m²/s²
0-3 km storm-relative helicity: 739 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.

000 
WGUS52 KFFC 210347
FFWFFC
GAC121-135-210745-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
1044 PM EST MON MAR 20 2006

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  FULTON COUNTY IN NORTH CENTRAL GEORGIA
  GWINNETT COUNTY IN NORTH CENTRAL GEORGIA

* UNTIL 245 AM EST

* AT 1036 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR            
  INDICATED FLASH FLOODING FROM NUMEROUS HEAVY SHOWERS MOVING        
  THROUGH THE NORTH ATLANTA METRO AREA.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  ROSWELL...NORCROSS AND ALPHARETTA.

FLOOD WATERS ARE MOVING DOWN CROOKED CREEK NEAR NORCROSS AND BIG 
CREEK NEAR ALPHARETTA. MINOR FLOODING OF THESE CREEKS IS EXPECTED.

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.

LAT...LON 3406 8440 3387 8417 3398 8403 3416 8430

IF YOU SEE SIGNIFICANT FLOODING CALL THE NATIONAL WEATHER SERVICE
TOLL FREE AT 1 8 6 6 7 6 3 4 4 6 6.

$$

2 follow-up statements

000 
WGUS72 KFFC 210414
FFSFFC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
1115 PM EST MON MAR 20 2006

GAC121-135-210745-
GWINNETT GA-FULTON GA-
1115 PM EST MON MAR 20 2006

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 245 AM EST FOR
NORTHEASTERN FULTON AND WEST CENTRAL GWINNETT COUNTIES...

WIDESPREAD RAIN OF TWO INCHES HAS FALLEN IN THE PAST FEW HOURS 
ACROSS THE NORTH ATLANTA METRO COUNTIES. ADDITIONAL RAINFALL AMOUNTS 
OF 0.25 TO 0.50 INCH CAN BE EXPECTED THROUGH 1 AM EST TUESDAY.

FOR THE BIG CREEK NEAR ALPHARETTA...
  MINOR FLOODING IS FORECAST.
  THE LATEST STAGE WAS 6.3 FEET AT 1030 PM MONDAY.
  FLOOD STAGE IS 7.0 FEET.
   THE FORECAST FOR THE BIG CREEK NEAR ALPHARETTA...
      THE RIVER WILL RISE ABOVE FLOOD STAGE AROUND 12 AM TUESDAY.
      THE RIVER WILL CREST NEAR 7.2 FEET AROUND 1 AM TUESDAY.
      THE RIVER WILL FALL BELOW FLOOD STAGE AROUND 8 AM TUESDAY.

AT 7.0 FEET...BANKFULL AND FLOOD STAGE ARE REACHED ALONG BIG CREEK
BETWEEN CUMMING IN FORSYTH COUNTY...TO ALPHARETTA...AND ROSWELL IN
NORTH FULTON COUNTY.  FLOODING STARTS TO EFFECT THE ALPHARETTA
GREENWAY AND ABOUT 200 FEET OF THE GREENWAY NEED TO BE CLOSED. IN
ADDITION...HIGH WATER BEGINS TO ENCROACH INTO PARK DOWNSTREAM OF GAGE
NEAR ROSWELL ALONG STATE HIGHWAY 9 AND RIVERSIDE ROAD.  

FOR THE CROOKED CREEK NEAR NORCROSS...
  MINOR FLOODING IS FORECAST.
  THE LATEST STAGE WAS 9.3 FEET AT 11 PM MONDAY.
  FLOOD STAGE IS 10.0 FEET.
   THE FORECAST FOR THE CROOKED CREEK NEAR NORCROSS IS TO RISE TO
   NEAR FLOOD STAGE BY 12 AM TUESDAY...THEN FALL QUICKLY THEREAFTER. 

AT 10.0 FEET...MINOR FLOODING OF THE NATURAL FLOOD PLAIN BEGINS 
MAINLY ON THE LEFT BANK UPSTREAM AND DOWNSTREAM FROM THE RIVER GAUGE 
AT SPALDING DRIVE.

LAT...LON 3406 8440 3387 8417 3398 8403 3416 8430

$$

000 
WGUS72 KFFC 210603
FFSFFC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
100 AM EST TUE MAR 21 2006

GAC121-135-210745-
GWINNETT GA-FULTON GA-
100 AM EST TUE MAR 21 2006

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 245 AM EST FOR 
NORTHEASTERN FULTON COUNTY...

...A FLASH FLOOD WARNING FOR WEST CENTRAL GWINNETT COUNTY HAS
BEEN CANCELLED...

WIDESPREAD RAIN AROUND TWO INCHES HAS FALLEN IN THE PAST FEW HOURS 
ACROSS THE NORTH ATLANTA METRO COUNTIES. ADDITIONAL RAINFALL AMOUNTS 
OF LESS THAN 0.25 INCH CAN BE EXPECTED THROUGH 3 AM EST TUESDAY.

FOR THE BIG CREEK NEAR ALPHARETTA...
  MINOR FLOODING IS FORECAST.
  THE LATEST STAGE WAS 7.1 FEET AT 1230 AM TUESDAY.
  FLOOD STAGE IS 7.0 FEET.
   THE FORECAST FOR THE BIG CREEK NEAR ALPHARETTA...      
     THE RIVER WILL CREST NEAR 7.2 FEET AROUND 2 AM TUESDAY.         
     THE RIVER WILL FALL BELOW FLOOD STAGE AROUND 8 AM TUESDAY.

AT 7.0 FEET...BANKFULL AND FLOOD STAGE ARE REACHED ALONG BIG CREEK
BETWEEN CUMMING IN FORSYTH COUNTY...TO ALPHARETTA...AND ROSWELL IN
NORTH FULTON COUNTY.  FLOODING STARTS TO EFFECT THE ALPHARETTA
GREENWAY AND ABOUT 200 FEET OF THE GREENWAY NEED TO BE CLOSED. IN
ADDITION...HIGH WATER BEGINS TO ENCROACH INTO PARK DOWNSTREAM OF GAGE
NEAR ROSWELL ALONG STATE HIGHWAY 9 AND RIVERSIDE ROAD.  

FOR THE CROOKED CREEK NEAR NORCROSS...
  THE LATEST STAGE WAS 7.9 FEET AT 1245 AM TUESDAY.
  CROOKED CREEK CREST AT 9.3 FEET AT 11 PM MONDAY. 
  FLOOD STAGE IS 10.0 FEET.
   THE FORECAST FOR THE CROOKED CREEK NEAR NORCROSS IS TO CONTINUE
   TO FALL. 

LAT...LON 3406 8440 3387 8417 3398 8403 3416 8430

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 20, 8:20 PM EST	Severe Thunderstorm Warning	FFC	Harris, Troup	55 min
Mar 20, 8:48 PM EST	Severe Thunderstorm Warning	FFC	Meriwether	57 min
Mar 20, 9:07 PM EST	Severe Thunderstorm Warning	FFC	Harris, Muscogee	53 min
Mar 20, 9:28 PM EST	Tornado Warning	FFC	Chattahoochee	29 min
Mar 20, 9:45 PM EST	Tornado Warning	FFC	Marion	45 min
Mar 20, 10:00 PM EST	Severe Thunderstorm Warning	FFC	Schley, Taylor	24 min
Mar 20, 10:11 PM EST	Severe Thunderstorm Warning	FFC	Macon	17 min
Mar 21, 1:24 AM EST	Severe Thunderstorm Warning	FFC	Harris	21 min
Mar 21, 2:53 AM EST	Severe Thunderstorm Warning	FFC	Jasper, Jones, Putnam	37 min
Mar 21, 3:12 AM EST	Severe Thunderstorm Warning	FFC	Baldwin	18 min
Mar 21, 3:33 AM EST	Flash Flood Warning	FFC	Harris	4 hr
Mar 21, 6:34 AM EST	Flash Flood Warning	FFC	Jones	86 min
Mar 21, 8:14 AM EST	Flash Flood Warning	FFC	Jones	3 hr

Nearby

Flash Flood Warnings in Georgia, 2006 Every flash flood warning in 2006

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.