Alert archive / Georgia / River Flood Warnings in 2010

River Flood Warning 133, NWS Atlanta, GA

August 21, 2010Gwinnett County, Georgia

NWS Atlanta, GA issued this river flood warning at Aug 21, 2010, 8:37 PM EDT for Gwinnett County, Georgia. It took effect at Aug 21, 2010, 9:02 PM EDT. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued
Aug 21, 2010, 8:37 PM EDT (00:37 UTC)
In effect from
Aug 21, 2010, 9:02 PM EDT
Expired
Aug 22, 2010, 2:41 AM EDT
In force
6 hr
Issued by
NWS Atlanta, GA
Flood severity
Minor

County Gwinnett County, GA

The radar

The Atlanta radar (KFFC), 83 km from the middle of the area, began a volume at 00:38 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 river

Written for the forecast point Suwanee Creek at Suwanee (SWEG1). The gauge peaked at 7.94 ft at Aug 21, 2010, 10:00 PM EDT.

actionminormoderate51008/2108/2208/23
Action stage
7 ft
Minor stage
8 ft
Moderate stage
11 ft
Major stage
14 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 02334885, one reading an hour, from a day before the product to a day after it ended. Flood stages are today's.

What forecasters said that day

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

NWS Atlanta, GA wrote its last area forecast discussion before this river flood warning went out at Aug 21, 3:49 PM EDT, 4 hours 48 minutes earlier.

Area forecast discussion, Aug 21, 3:49 PM EDT, 4 hours 48 minutes before
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Hazardous weather outlook, Aug 21, 5:01 AM EDT, 15 hours 36 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
501 AM EDT SAT AUG 21 2010

GAZ001>009-011>016-019>025-027-030>039-041>062-066>076-078>086-
089>098-102>113-221100-
BALDWIN-BANKS-BARROW-BARTOW-BIBB-BLECKLEY-BUTTS-CARROLL-CATOOSA-
CHATTAHOOCHEE-CHATTOOGA-CHEROKEE-CLARKE-CLAYTON-COBB-COWETA-
CRAWFORD-CRISP-DADE-DAWSON-DEKALB-DODGE-DOOLY-DOUGLAS-EMANUEL-
FANNIN-FAYETTE-FLOYD-FORSYTH-GILMER-GLASCOCK-GORDON-GREENE-
GWINNETT-HALL-HANCOCK-HARALSON-HARRIS-HEARD-HENRY-HOUSTON-JACKSON-
JASPER-JEFFERSON-JOHNSON-JONES-LAMAR-LAURENS-LUMPKIN-MACON-
MADISON-MARION-MERIWETHER-MONROE-MONTGOMERY-MORGAN-MURRAY-
MUSCOGEE-NEWTON-NORTH FULTON-OCONEE-OGLETHORPE-PAULDING-PEACH-
PICKENS-PIKE-POLK-PULASKI-PUTNAM-ROCKDALE-SCHLEY-SOUTH FULTON-
SPALDING-STEWART-SUMTER-TALBOT-TALIAFERRO-TAYLOR-TELFAIR-TOOMBS-
TOWNS-TREUTLEN-TROUP-TWIGGS-UNION-UPSON-WALKER-WALTON-WARREN-
WASHINGTON-WEBSTER-WHEELER-WHITE-WHITFIELD-WILCOX-WILKES-
WILKINSON-
501 AM EDT SAT AUG 21 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH AND CENTRAL GEORGIA.

.DAY ONE...TODAY AND TONIGHT
SCATTERED TO NUMEROUS THUNDERSTORMS EXPECTED THIS AFTERNOON AND
EVENING.

.SYNOPSIS...
A WEAK FRONTAL BOUNDARY WILL MEANDER ACROSS NORTH GEORGIA TODAY.
DEEP TROPICAL MOISTURE AND A MID LEVEL LOW PRESSURE SYSTEM WILL
REMAIN PARKED OVER THE STATE.

.PRIMARY HAZARDS...
THE PRIMARY HAZARDS FROM THUNDERSTORMS WILL BE WIND GUSTS TO 40 MPH,
CLOUD TO GROUND LIGHTNING AND LOCALLY HEAVY RAIN. THE GREATER
THUNDERSTORM THREAT WILL OCCUR BETWEEN THE HOURS OF 1 PM AND
MIDNIGHT.

.DISCUSSION...
A FRONTAL BOUNDARY ACROSS NORTH GEORGIA AND A MID LEVEL LOW
PRESSURE SYSTEM OVER CENTRAL GEORGIA WILL INTERACT WITH DEEP
TROPICAL MOISTURE TO PRODUCE NUMEROUS SHOWERS AND THUNDERSTORMS
THIS AFTERNOON AND EVENING. MODERATE INSTABILITIES ARE EXPECTED
AS CAPE VALUES INCREASE TO AROUND 2500 DURING AFTERNOON HEATING.
THE WEAKLY SHEARED ENVIRONMENT WILL RESULT IN SLOW MOVING STORMS.
THIS COUPLED WITH OVER TWO INCH PRECIPITABLE WATER VALUES WILL
BRING A THREAT OF LOCALLY HEAVY RAIN... AND POSSIBLY RESULT IN
MINOR FLOODING OF LOW LYING... FLOOD PRONE AREAS. ALTHOUGH A FEW
STORMS COULD BE STRONG... SEVERE THUNDERSTORMS ARE NOT EXPECTED AT
THIS TIME. THE THUNDERSTORM THREAT SHOULD GREATLY DIMINISH BY
MIDNIGHT.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY
THUNDERSTORMS ARE LIKELY AGAIN ON SUNDAY. OTHERWISE...THERE IS A
CHANCE OF THUNDERSTORMS EACH DAY...MAINLY IN THE AFTERNOON AND
EVENING HOURS.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION IS NOT EXPECTED THROUGH TONIGHT.

In the hours before

Special weather statement, Aug 21, 5:33 PM EDT, 3 hours 4 minutes before
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Special weather statement, Aug 21, 5:42 PM EDT, 2 hours 55 minutes before
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Special weather statement, Aug 21, 6:09 PM EDT, 2 hours 28 minutes before
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Special weather statement, Aug 21, 6:40 PM EDT, 1 hour 57 minutes before
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Special weather statement, Aug 21, 7:03 PM EDT, 1 hour 34 minutes before
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Special weather statement, Aug 21, 7:29 PM EDT, 1 hour 8 minutes before
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Nearby

River Flood Warnings in Georgia, 2010Every river flood warning in 2010

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive; the gauge from the NWS water service and the USGS.