Alert archive / Georgia / Flash Flood Warnings in 2009
Flash Flood Warning 1, NWS Atlanta, GA
NWS Atlanta, GA issued this flash flood warning at Mar 27, 2009, 4:45 PM EDT for 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 27, 2009, 4:45 PM EDT (20:45 UTC)
- Expired
- Mar 27, 2009, 9:00 PM EDT
- In force
- 4 hr
- Issued by
- NWS Atlanta, GA
- Area
- Storm-based polygon
- Flood severity
- None
County Gwinnett County, GA
The radar
The Atlanta radar (KFFC), 85 km from the middle of the area, began a volume at 20:44 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, 8.8 hours before the alert went out and 82 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.
- Mixed-layer CAPE
- 56 J/kg
- Mixed-layer CIN
- -32 J/kg
- Mixed-layer LCL
- 487 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 97 m²/s²
- 0-3 km storm-relative helicity
- 212 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
WGUS52 KFFC 272045
FFWFFC
GAC135-280245-
/O.NEW.KFFC.FF.W.0001.090327T2045Z-090328T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
445 PM EDT FRI MAR 27 2009
THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A
* FLASH FLOOD WARNING FOR...
GWINNETT COUNTY IN NORTH CENTRAL GEORGIA
* UNTIL 1045 PM EDT
* AT 441 PM EDT...THE STAGE ON THE ALCOVY RIVER NEAR LAWRENCEVILLE
WAS 9.2 FEET. FLOOD STAGE IS 9.0 FEET. THE ALCOVY RIVER WILL FALL
BELOW FLOOD STAGE BY 1045 PM.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS...OR WATERS OF UNKNOWN DEPTH...ON FOOT OR IN
AN AUTOMOBILE.
IF YOU SEE SIGNIFICANT FLOODING CALL THE NATIONAL WEATHER SERVICE
TOLL FREE AT 1 8 6 6 7 6 3 4 4 6 6.
&&
LAT...LON 3410 8386 3410 8383 3400 8386 3393 8380
3375 8403 3375 8404 3393 8427 3397 8427
3400 8423 3400 8419 3403 8416 3405 8412
3409 8412 3418 8406
$$2 follow-up statements
000
WGUS72 KFFC 272247
FFSFFC
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
647 PM EDT FRI MAR 27 2009
GAC135-280245-
/O.CON.KFFC.FF.W.0001.000000T0000Z-090328T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GWINNETT GA-
647 PM EDT FRI MAR 27 2009
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1045 PM EDT FOR
GWINNETT COUNTY...
AT 642 PM EDT...THE STAGE ON THE ALCOVY RIVER NEAR LAWRENCEVILE WAS
9.5 FEET. FLOOD STAGE IS 9.0 FEET. THE ALCOVY RIVER SHOULD CREST
NEAR 9.7 FEET AROUND 8 PM AND THEN FALL BELOW FLOOD STAGE BY 1045 PM.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS...OR WATERS OF UNKNOWN DEPTH...ON FOOT OR IN
AN AUTOMOBILE.
IF YOU SEE SIGNIFICANT FLOODING CALL THE NATIONAL WEATHER SERVICE
TOLL FREE AT 1 8 6 6 7 6 3 4 4 6 6.
&&
LAT...LON 3410 8386 3410 8383 3400 8386 3393 8380
3375 8403 3375 8404 3393 8427 3397 8427
3400 8423 3400 8419 3403 8416 3405 8412
3409 8412 3418 8406
$$000
WGUS72 KFFC 280100
FFSFFC
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
800 PM EDT FRI MAR 27 2009
GAC135-280108-
/O.CAN.KFFC.FF.W.0001.000000T0000Z-090328T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GWINNETT GA-
800 PM EDT FRI MAR 27 2009
...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR GWINNETT COUNTY...
* AT 845 PM THE STAGE ON THE ALCOVY RIVER NEAR LAWRENCEVILLE WAS 8.8
FEET. FLOOD STAGE IS 9.0 FEET. THE ALCOVY RIVER WILL CONTINUE TO
FALL AND REMAIN BELOW FLOOD STAGE.
IF YOU SEE SIGNIFICANT FLOODING CALL THE NATIONAL WEATHER SERVICE
TOLL FREE AT 1 8 6 6 7 6 3 4 4 6 6.
LAT...LON 3410 8386 3410 8383 3400 8386 3393 8380
3375 8403 3375 8404 3393 8427 3397 8427
3400 8423 3400 8419 3403 8416 3405 8412
3409 8412 3418 8406
$$The office that day
Everything else NWS Atlanta, GA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 27, 3:54 PM EDT | River Flood Warning | FFC | Clarke, Greene, Oconee | 4 days |
Nearby
Flash Flood Warnings in Georgia, 2009Every flash flood warning in 2009
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.