Alert archive / Georgia / Areal Flood Warnings in 2009

Areal Flood Warning 29, NWS Atlanta, GA

April 2, 2009Johnson County, Georgia

NWS Atlanta, GA issued this areal flood warning at Apr 2, 2009, 8:19 PM EDT for Johnson County, Georgia. It was in force for 12 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
Apr 2, 2009, 8:19 PM EDT (00:19 UTC)
Expired
Apr 3, 2009, 8:15 AM EDT
In force
12 hr
Issued by
NWS Atlanta, GA
Area
Storm-based polygon
Flood severity
None

County Johnson County, GA

The radar

The Robins AFB radar (KJGX), 65 km from the middle of the area, began a volume at 00:22 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, 0.3 hours before the alert went out and 187 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, Peachtre/Fal Fld, GA at 00:00Z on 2009-04-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 11 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Peachtre/Fal Fld, GA at 00:00Z on 2009-04-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 356 square meters per square second.1939587897Sfc1 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
11 J/kg
Mixed-layer CIN
-68 J/kg
Mixed-layer LCL
590 m above ground
0-6 km bulk shear
83 kt
0-1 km storm-relative helicity
356 m²/s²
0-3 km storm-relative helicity
483 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 Apr 2, 4:08 PM EDT, 4 hours 11 minutes earlier.

Area forecast discussion, Apr 2, 4:08 PM EDT, 4 hours 11 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
408 PM EDT THU APR 2 2009

.SHORT TERM /TONIGHT THROUGH SATURDAY NIGHT/...
STRONG COMPLEX LOW PRESSURE SYSTEM DRIFTING NORTHEAST FROM THE
SOUTHERN PLAINS PROGD TO CONTINUE MOVING NORTHEAST...PULLING A
COLD FRONT ACROSS THE SOUTHEAST U.S TONIGHT AND FRIDAY. MODELS
SIMILAR WITH THE FRONT PUSHING INTO NORTHWEST GEORGIA THIS
EVENING... NEARING AN ATL TO AHN LINE AROUND MIDNIGHT...THEN
MOVING SOUTH OF THE COUNTY WARNING BEFORE SUNRISE FRIDAY.
CURRENTLY WATCHING BROAD AREA OF RAIN WITH EMBEDDED HEAVY SHOWERS
LIFTING ACROSS NORTH AND CENTRAL GEORGIA THIS AFTERNOON...AS
SQUALL LINE ASSOCIATED WITH THE COLD FRONT PUSHES ACROSS
MISSISSIPPI INTO WESTERN ALABAMA. SPC STILL PEGGING MUCH OF THE
SOUTHEAST U.S FOR SLIGHT RISK OF SEVERE STORMS THIS AFTERNOON AND
TONIGHT...BUT HAVE BACKED OFF ON MODERATE RISK EXTENDING INTO
WESTERN GEORGIA. NONETHELESS...ANTICIPATE MUCH OF THE CWA WILL SEE
STRONG TO SEVERE STORMS LATE THIS AFTERNOON AND EVENING AS THE
SQUALL LINE PUSHES THROUGH. HEAVY RAIN/FLOODING THREAT CONTINUES
MAINLY OVER CENTRAL GEORGIA OVERNIGHT...WHERE WE HAVE ALREADY SEEN
THE BEST RAINFALL AMOUNTS TODAY. WINDS ALSO LOOK TO PICKUP LATE
TONIGHT INTO FRIDAY...AND WILL ISSUE WIND ADVISORY FOR EXTREME
NORTH GEORGIA WHERE WE COULD SEE SOME GUSTS OF UP TO 40 MPH AS THE
LOW LEVEL JET TRANSLATES ACROSS THE AREA. MODELS SIMILAR WITH THE
LOW LIFTING INTO THE GREAT LAKE REGION EARLY FRIDAY AS THE COLD
FRONT MOVES OFF THE SOUTHEAST COAST. HIGH PRESSURE AND DRIER AIR
SPREADS INTO NORTH AND CENTRAL GEORGIA BEHIND THE FRONT FRIDAY
WITH A DRY FORECAST AND NEAR NORMAL TEMPS ON TAP FOR MUCH OF THE
AREA INTO THE WEEKEND.

.LONG TERM /SUNDAY THROUGH THURSDAY/...
EXTENDED PROGS SIMILAR WITH THIS HIGH SHIFTING OFF THE SOUTHEAST
U.S. COAST EARLY SUNDAY AS A LOW PRESSURE SYSTEM LIFTS INTO THE
GREAT LAKES REGION...PULLING A COLD FRONT INTO THE LOWER
MISSISSIPPI VALLEY. THIS NEXT LOW PRESSURE SYSTEM DEEPENS AS IT MOVES
NORTHEAST AND BECOMES POSITIONED OVER THE NEW ENGLAND STATES BY
12Z MON. THE ASSOCIATED COLD FRONT SWEEPS THROUGH GA SUN
EVENING/MONDAY MORNING BUT WITH THE LOW CENTER BEING SO FAR NORTH
THE BEST DYNAMICS AND INSTABILITY STAY NORTH OF THE AREA. SHOULD
SEE SOME SHOWERS AND THUNDERSTORMS ACROSS THE AREA AS THE FRONT
MOVES THROUGH... BUT THE BIGGEST THREAT FROM THIS SYSTEM WILL BE
THE COLD AIR MASS THIS LOW CENTER PULLS DOWN FROM CANADA INTO THE
SOUTHERN U.S. AS THIS LOW MOVES EAST...A VERY COLD AIRMASS GETS
WRAPPED AROUND THE BACK SIDE AND MOVES SOUTH. LOOKING FOR DAY TIME
HIGHS MON/TUE IN THE 40S AND 50S WITH LOW TEMPS MON NIGHT/TUE
NIGHT IN THE 20S AND 30S. SURFACE HIGH PRESSURE BECOMES RE-
ESTABLISHED ACROSS THE SOUTHEAST U.S. TUESDAY WITH DRY FORECAST
FOR NORTH AND CENTRAL GEORGIA EXPECTED THROUGH WED NIGHT.AROUND.
SURFACE HIGH PRESSURE BECOMES RE- ESTABLISHED ACROSS THE SOUTHEAST
U.S. TUESDAY WITH DRY FORECAST FOR NORTH AND CENTRAL GEORGIA
LOOKING GOOD INTO MID WEEK.

&&

.PRELIMINARY POINT TEMPS/POPS...
ATHENS          55  66  43  75  50 /  70   5   5   5   5
ATLANTA         55  63  47  73  55 /  70   5   5   5   5
BLAIRSVILLE     54  57  39  72  45 /  80  20   5   5  10
CARTERSVILLE    54  60  41  74  49 /  80  10   5   5  10
COLUMBUS        57  67  47  80  55 /  70   5   5   5   5
GAINESVILLE     55  63  42  73  52 /  80  20   5   5  10
MACON           58  70  44  78  50 /  70   5   5   5   5
ROME            55  65  43  77  49 /  80  10   5   5  10
PEACHTREE CITY  53  63  40  75  48 /  70   5   5   5   5
VIDALIA         62  76  46  78  51 /  70   5   5   5   5

&&

.FFC WATCHES/WARNINGS/ADVISORIES...
WIND ADVISORY FROM MIDNIGHT TONIGHT TO 4 PM EDT FRIDAY FOR THE
FOLLOWING ZONES: CATOOSA...CHATTOOGA...DADE...DAWSON...FANNIN...
FLOYD...GILMER...GORDON...LUMPKIN...MURRAY...PICKENS...TOWNS...
UNION...WALKER...WHITE...WHITFIELD.

&&

49
Hazardous weather outlook, Apr 2, 5:13 PM EDT, 3 hours 6 minutes before
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In the hours before

Special weather statement, Apr 2, 6:33 PM EDT, 1 hour 46 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
633 PM EDT THU APR 2 2009

GAZ110-022315-
633 PM EDT THU APR 2 2009

...SIGNIFICANT WEATHER ALERT FOR WIND GUSTS TO 45 MPH...FREQUENT
CLOUD-TO-GROUND LIGHTNING...PEA-SIZED HAIL...AND VERY HEAVY RAIN IN
TELFAIR COUNTY UNTIL 715 PM EDT...

AT 630 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM NEAR QUEENSLAND IN NORTHERN BEN HILL
COUNTY...MOVING EAST AT 45 MPH.

WIND GUSTS UP TO 45 MPH CAN BE EXPECTED WITH THIS
THUNDERSTORM...ALONG WITH PEA-SIZED HAIL...FREQUENT CLOUD-TO-GROUND
LIGHTNING...AND VERY HEAVY RAIN.

RUNOFF FROM THESE STORMS WILL CAUSE MINOR FLOODING OF SMALL CREEKS
AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES ACROSS
TELFAIR COUNTY. THE GROUND IS SATURATED FROM RECENT REPEATED HEAVY
RAINFALL. COUNTRY ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS AND
STREAMS ARE SUBJECT TO MINOR FLOODING.

SIGNIFICANT WEATHER ALERTS ARE ISSUED WHEN WINDS UP TO 57 MPH ARE
EXPECTED...HAIL IS EXPECTED TO BE LESS THAN THE SIZE OF PENNIES...OR
SIGNIFICANT CLOUD-TO-GROUND LIGHTNING IS EXPECTED.

19
Special weather statement, Apr 2, 7:03 PM EDT, 1 hour 16 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
703 PM EDT THU APR 2 2009

GAZ111-112-022345-
703 PM EDT THU APR 2 2009

...SIGNIFICANT WEATHER ALERT FOR 40 MPH WINDS...FREQUENT
LIGHTNING...AND VERY HEAVY RAIN IN WHEELER AND MONTGOMERY
COUNTIES UNTIL 745 PM EDT...

AT 658 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF STRONG THUNDERSTORMS FROM MCRAE...TO LUMBER CITY...MOVING
NORTHEAST AT 45 MPH.

THESE WIND GUSTS MAY PRODUCE MINOR DAMAGE TO TREE LIMBS AND BLOW
LIGHT...UNSECURED OBJECTS AROUND. IN ADDITION...RUNOFF FROM THESE
STORMS WILL CAUSE MINOR FLOODING OF SMALL CREEKS AND STREAMS...URBAN
AREAS...HIGHWAYS...STREETS AND UNDERPASSES ACROSS WHEELER AND
MONTGOMERY COUNTIES. THE GROUND IS TOTALLY SATURATED FROM RECENT
HEAVY RAINFALL.  ADDITIONALLY...COUNTRY ROADS AND FARMLANDS ALONG
THE BANKS OF CREEKS AND STREAMS ARE SUBJECT TO MINOR FLOODING.

19
Local storm report, Apr 2, 7:56 PM EDT, 23 minutes before
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
756 PM EDT THU APR 02 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0100 AM     HAIL             CONYERS                 33.67N 84.02W
04/02/2009  E0.88 INCH       ROCKDALE           GA   PUBLIC

0234 AM     HAIL             ANTIOCH                 33.95N 85.16W
04/02/2009  E0.50 INCH       POLK               GA   FIRE DEPT/RESCUE

            LASTED FOR ABOUT 20 MINUTES.

0242 AM     HAIL             DULUTH                  34.00N 84.14W
04/02/2009  E0.88 INCH       GWINNETT           GA   PUBLIC

0400 AM     TSTM WND DMG     FAYETTEVILLE            33.45N 84.46W
04/02/2009                   FAYETTE            GA   COUNTY OFFICIAL

0445 AM     HAIL             FORSYTH                 33.03N 83.94W
04/02/2009  E0.88 INCH       MONROE             GA   LAW ENFORCEMENT

0500 AM     TSTM WND DMG     CATAULA                 32.66N 84.87W
04/02/2009                   HARRIS             GA   COUNTY OFFICIAL

            1 TREE DOWN

0600 AM     HAIL             MILLEDGEVILLE           33.09N 83.24W
04/02/2009  E0.25 INCH       BALDWIN            GA   COUNTY OFFICIAL

0600 AM     HEAVY RAIN       12 ESE ROBERTA          32.65N 83.82W
04/02/2009  M1.67 INCH       CRAWFORD           GA   PUBLIC

            MEASURED BETWEEN 500 AND 600 AM EDT

0615 AM     HAIL             12 ESE ROBERTA          32.65N 83.82W
04/02/2009  E0.25 INCH       CRAWFORD           GA   PUBLIC

0630 AM     HAIL             1 NE WEST POINT         32.89N 85.16W
04/02/2009  E0.25 INCH       TROUP              GA   PUBLIC

1219 PM     HAIL             GRANT PARK              33.74N 84.37W
04/02/2009  E0.25 INCH       FULTON             GA   NWS EMPLOYEE

            A FEW PEA SIZED HAIL STONES.

&&

SLAMBACK

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 2, 11:58 PM EDTSevere Thunderstorm WarningFFCChattooga, Floyd, Haralson, Polk54 min
Apr 3, 12:49 AM EDTSevere Thunderstorm WarningFFCCarroll26 min
Apr 3, 12:55 AM EDTSevere Thunderstorm WarningFFCHeard50 min
Apr 3, 12:59 AM EDTAreal Flood WarningFFCJefferson, Washington12 hr
Apr 3, 1:39 AM EDTRiver Flood WarningFFCWashington, Wilkinson28 hr
Apr 3, 2:03 AM EDTAreal Flood WarningFFCTaliaferro, Warren, Wilkes11 hr
Apr 3, 11:53 AM EDTRiver Flood WarningFFCPulaski30 hr
Apr 3, 11:53 AM EDTRiver Flood WarningFFCJefferson, Washington6 hr
Apr 3, 11:53 AM EDTRiver Flood WarningFFCDooly9 hr

Nearby

Areal Flood Warnings in Georgia, 2009Every 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.