Alert archive / Georgia / Areal Flood Warnings in 2009

Areal Flood Warning 43, NWS Atlanta, GA

September 20, 20094 counties in Georgia

NWS Atlanta, GA issued this areal flood warning at Sep 20, 2009, 1:17 PM EDT for 4 counties in Georgia. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Sep 20, 2009, 1:17 PM EDT (17:17 UTC)
Expired: Sep 20, 2009, 7:15 PM EDT
In force: 6 hr
Issued by: NWS Atlanta, GA
Area: Storm-based polygon
Flood severity: None

Counties Lumpkin County, GA, Towns County, GA, Union County, GA, White County, GA

The radar

The Greer radar (KGSP), 151 km from the middle of the area, began a volume at 17:19 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, 5.3 hours before the alert went out and 163 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: 977 J/kg
Mixed-layer CIN: -26 J/kg
Mixed-layer LCL: 520 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: 132 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal 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 areal flood warning went out at Sep 20, 11:51 AM EDT, 1 hour 26 minutes earlier.

Area forecast discussion, Sep 20, 11:51 AM EDT, 1 hour 26 minutes before

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Hazardous weather outlook, Sep 20, 6:32 AM EDT, 6 hours 45 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
632 AM EDT SUN SEP 20 2009

GAZ001>009-011>016-019>025-027-030>039-041>062-066>076-078>086-
089>098-102>113-211045-
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-
632 AM EDT SUN SEP 20 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH AND CENTRAL GEORGIA.

.DAY ONE...TODAY AND TONIGHT
OCCASIONAL SHOWERS AND THUNDERSTORMS EXPECTED WITH HEAVY RAINFALL
AND POSSIBLE FLOODING.

.SYNOPSIS...
LOW PRESSURE OVER THE MIDDLE MISSISSIPPI VALLEY CONTINUES TO DRAW
A VERY MOIST TROPICAL AIRMASS NORTHWARD FROM THE GULF INTO MUCH OF
THE SOUTHEASTERN STATES. A SERIES OF UPPER LEVEL WEATHER
DISTURBANCES CROSSING GEORGIA TODAY ALONG WITH SOUTHEASTERLY
UPSLOPE FLOW WILL ENHANCE RAINFALL ACROSS THE LOCAL AREA TODAY.

.PRIMARY HAZARDS...
HEAVY RAINFALL AND FLOODING WILL BE THE MAIN HAZARDS TODAY AND
TONIGHT...ESPECIALLY ACROSS NORTH GEORGIA. A FEW LIGHTNING STRIKES
WILL ALSO OCCUR.

.DISCUSSION...
THE ATMOSPHERE REMAINS VERY MOIST WITH PRECIPITABLE WATER VALUES
AROUND 2 INCHES...AND WILL BECOME SOMEWHAT MORE UNSTABLE WITH
CAPES APPROACHING 1000 THIS AFTERNOON. SOILS ARE SATURATED AFTER
SEVERAL DAYS OF WIDESPREAD RAINFALL AND ADDITIONAL HEAVY RAIN IS
EXPECTED TODAY...ESPECIALLY ACROSS NORTH GEORGIA. THIS MAY LEAD TO
ADDITIONAL FLOODING ALONG CREEKS...STREAMS...RIVERS AND OTHER LOW
LYING AREAS. A FLOOD WATCH REMAINS IN EFFECT THROUGH MONDAY.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY
A GOOD CHANCE OF SHOWERS AND THUNDERSTORMS EXISTS EACH DAY...WITH
HEAVY RAIN REMAINING POSSIBLE AT LEAST THROUGH MONDAY.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION IS NOT EXPECTED BUT SPOTTERS ARE ENCOURAGED TO
SUBMIT REPORTS OF HEAVY RAIN AND FLOODING THROUGH THE WEB BY GOING
TO WEATHER.GOV/ATLANTA.

In the hours before

Special weather statement, Sep 20, 8:21 AM EDT, 4 hours 56 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
821 AM EDT SUN SEP 20 2009

GAZ032-033-043>045-053>055-201300-
821 AM EDT SUN SEP 20 2009

...SIGNIFICANT WEATHER ALERT FOR HEAVY RAIN IN COWETA...FAYETTE...
CLAYTON...DOUGLAS...DEKALB...COBB AND FULTON COUNTIES UNTIL 900 AM
EDT...

AT 817 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WITH VERY HEAVY RAIN FROM DOBBINS AIR RESERVE BASE TO
CANNONGATE...MOVING NORTHEAST AT 15 MPH. THESE STORMS ARE MOVING
OVER SOME OF THE SAME AREAS THAT RECEIVED BETWEEN 3 AND 4 INCHES OF
RAIN SATURDAY MORNING. RESIDENTS ARE URGED TO STAY TUNED TO NOAA
WEATHER RADIO...WEATHER.GOV OR OTHER MEDIA OUTLETS FOR FURTHER
STATEMENTS OR POSSIBLE WARNINGS ON THESE STORMS.

RUNOFF FROM THESE STORMS WILL CAUSE MINOR FLOODING OF SMALL CREEKS
AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES ACROSS
COWETA...FAYETTE...CLAYTON...DOUGLAS...DEKALB...COBB AND FULTON
COUNTIES...INCLUDING AREAS AROUND TYRONE...SANDTOWN...CAMPBELLTON...
UNION CITY...PALMETTO...FAIRBURN...CANNONGATE...SWEETWATER CREEK
STATE PARK...LITHIA SPRINGS...DUE WEST...JIM R MILLER PARK...SIX
FLAGS OVER GEORGIA...WHITE WATER PARK...DOBBINS AIR RESERVE BASE AND
MABLETON. ADDITIONALLY...COUNTRY ROADS AND FARMLANDS ALONG THE BANKS
OF CREEKS AND STREAMS ARE SUBJECT TO MINOR FLOODING.

Special weather statement, Sep 20, 8:57 AM EDT, 4 hours 20 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
857 AM EDT SUN SEP 20 2009

GAZ032-033-043>045-053>055-201430-
857 AM EDT SUN SEP 20 2009

...SIGNIFICANT WEATHER ALERT FOR HEAVY RAIN IN COWETA...FAYETTE...
CLAYTON...DOUGLAS...DEKALB...COBB AND FULTON COUNTIES UNTIL 1030 AM
EDT...

AT 856 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS FROM SANDY PLAINS TO FAIRBURN...MOVING NORTHEAST
AT 10 MPH. THESE STORMS ARE MOVING OVER SOME OF THE SAME AREAS THAT
RECEIVED BETWEEN 3 AND 4 INCHES OF RAIN SATURDAY MORNING. RESIDENTS
ARE URGED TO STAY TUNED TO NOAA WEATHER RADIO...WEATHER.GOV OR OTHER
MEDIA OUTLETS FOR FURTHER STATEMENTS OR POSSIBLE WARNINGS ON THESE
STORMS.

RUNOFF FROM THESE STORMS WILL CAUSE MINOR FLOODING OF SMALL CREEKS
AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES ACROSS
COWETA...FAYETTE...CLAYTON...DOUGLAS...DEKALB...COBB AND FULTON
COUNTIES...INCLUDING AREAS AROUND EDGEWOOD...KENWOOD...LA VISTA...
KIRKWOOD...EAST LAKE...GRESHAM PARK...AVONDALE ESTATES...DECATUR...
DRUID HILLS...VIRGINIA HIGHLAND...SWEET AUBURN...LAKEWOOD PARK...
GRANT PARK-ZOO ATLANTA...TURNER FIELD AND LITTLE FIVE POINTS.
ADDITIONALLY...COUNTRY ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS
AND STREAMS ARE SUBJECT TO MINOR FLOODING.

Special weather statement, Sep 20, 12:53 PM EDT, 24 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 20, 5:37 AM EDT	Flash Flood Warning	FFC	Lumpkin	6 hr
Sep 20, 6:34 AM EDT	Flash Flood Warning	FFC	Union	6 hr
Sep 20, 6:43 AM EDT	Flash Flood Warning	FFC	White	6 hr
Sep 20, 7:40 AM EDT	Flash Flood Warning	FFC	Towns	6 hr
Sep 20, 11:23 AM EDT	Areal Flood Warning	FFC	Lumpkin	112 min
Sep 20, 11:59 AM EDT	River Flood Warning	FFC	Clarke, Greene, Oconee	5 days
Sep 20, 12:23 PM EDT	Areal Flood Warning	FFC	Union, White	52 min
Sep 20, 1:51 PM EDT	Areal Flood Warning	FFC	Cobb	6 hr
Sep 20, 2:45 PM EDT	Flash Flood Warning	FFC	Cherokee	6 hr
Sep 20, 5:35 PM EDT	River Flood Warning	FFC	Dawson, Forsyth	38 hr
Sep 20, 6:32 PM EDT	Flash Flood Warning	FFC	Catoosa, Walker	6 hr
Sep 20, 6:56 PM EDT	Flash Flood Warning	FFC	Paulding	4 hr
Sep 20, 7:14 PM EDT	Flash Flood Warning	FFC	Cobb	4 hr

Nearby

Areal Flood Warnings in Georgia, 2009 Every areal 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.