Alert archive / Georgia / Areal Flood Warnings in 2015

Areal Flood Warning 1, NWS Atlanta, GA

August 18, 2015Morgan County, Oconee County, Georgia

NWS Atlanta, GA issued this areal flood warning at Aug 18, 2015, 11:52 PM EDT for Morgan County, Oconee 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 counties it named.

The facts

Issued
Aug 18, 2015, 11:52 PM EDT (03:52 UTC)
Expired
Aug 19, 2015, 3:45 AM EDT
In force
4 hr
Issued by
NWS Atlanta, GA
Area
Storm-based polygon
Flood severity
None

Counties Morgan County, GA, Oconee County, GA

The radar

The Atlanta radar (KFFC), 109 km from the middle of the area, began a volume at 03:54 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, 3.9 hours before the alert went out and 103 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 2015-08-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 648 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 2015-08-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 108 square meters per square second.193958Sfc1 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
648 J/kg
Mixed-layer CIN
-35 J/kg
Mixed-layer LCL
1135 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
108 m²/s²
0-3 km storm-relative helicity
105 m²/s²
Significant tornado parameter
0.2
Supercell composite
2.4

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 Aug 18, 10:20 PM EDT, 1 hour 32 minutes earlier.

Area forecast discussion, Aug 18, 10:20 PM EDT, 1 hour 32 minutes before
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Hazardous weather outlook, Aug 18, 10:15 PM EDT, 1 hour 37 minutes before
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In the hours before

Special weather statement, Aug 18, 7:13 PM EDT, 4 hours 39 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
713 PM EDT TUE AUG 18 2015

GAZ038-039-050-051-190015-
TALIAFERRO GA-OGLETHORPE GA-GREENE GA-WILKES GA-
713 PM EDT TUE AUG 18 2015

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN TALIAFERRO...
OGLETHORPE...NORTHEASTERN GREENE AND WILKES COUNTIES UNTIL 815 PM
EDT...

AT 712 PM EDT...A STRONG THUNDERSTORM WAS SOUTHEAST OF LEXINGTON...
MOVING EAST AT 25 MPH.

  HAZARD...WINDS UP TO 40 MPH...FREQUENT LIGHTNING AND HEAVY RAIN.

  IMPACT...PEOPLE OUTDOORS SHOULD SEEK SHELTER IMMEDIATELY. EXPECT
           MINOR DAMAGE TO TREE LIMBS AND BLOWING AROUND OF
           LIGHT...UNSECURED OBJECTS. ELECTRICAL APPLIANCES SHOULD
           NOT BE USED UNLESS IN AN EMERGENCY. LOCALIZED FLOODING IN
           LOW LYING AND POOR DRAINAGE AREAS IS ALSO LIKELY.
           MOTORISTS SHOULD SLOW DOWN AND BE PREPARED FOR POSSIBLE
           LOSS OF CONTROL DUE TO HYDROPLANING. WHEN WATER COVERS
           THE ROAD REMEMBER...TURN AROUND...DO NOT DROWN.

SOME LOCATIONS IN THE PATH OF THIS STORM INCLUDE
WASHINGTON...LEXINGTON...TIGNALL...WOODVILLE...RAYLE...CELESTE...
CARTERS GROVE...JACKSONS CROSSROADS...DELHI...NEWTOWN...METASVILLE...
FLORAL HILL...MALLORYSVILLE...NORMAN...DANBURG...PHILOMATH AND
HUTCHINGS.

LAT...LON 3367 8310 3384 8317 3399 8286 3399 8284
      3397 8278 3398 8269 3399 8266 3399 8265
      3387 8261 3384 8259 3383 8260 3375 8255
TIME...MOT...LOC 2312Z 251DEG 23KT 3378 8305
Special weather statement, Aug 18, 7:15 PM EDT, 4 hours 37 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
715 PM EDT TUE AUG 18 2015

GAZ034-035-047-182345-
GWINNETT GA-BARROW GA-WALTON GA-
715 PM EDT TUE AUG 18 2015

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN GWINNETT...
SOUTHWESTERN BARROW AND NORTHWESTERN WALTON COUNTIES UNTIL 745 PM
EDT...

AT 715 PM EDT...A STRONG THUNDERSTORM WAS NEAR GRAYSON...OR 7 MILES
SOUTHEAST OF LAWRENCEVILLE...MOVING EAST AT 20 MPH.

  HAZARD...WINDS UP TO 40 MPH...FREQUENT LIGHTNING AND HEAVY RAIN.

  IMPACT...PEOPLE OUTDOORS SHOULD SEEK SHELTER IMMEDIATELY. EXPECT
           MINOR DAMAGE TO TREE LIMBS AND BLOWING AROUND OF
           LIGHT...UNSECURED OBJECTS. ELECTRICAL APPLIANCES SHOULD
           NOT BE USED UNLESS IN AN EMERGENCY. LOCALIZED FLOODING IN
           LOW LYING AND POOR DRAINAGE AREAS IS ALSO LIKELY.
           MOTORISTS SHOULD SLOW DOWN AND BE PREPARED FOR POSSIBLE
           LOSS OF CONTROL DUE TO HYDROPLANING. WHEN WATER COVERS
           THE ROAD...REMEMBER TO TURN AROUND DON'T DROWN.

SOME LOCATIONS IN THE PATH OF THIS STORM INCLUDE
LAWRENCEVILLE...WINDER...SNELLVILLE...LOGANVILLE...DACULA...
GRAYSON...STATHAM...BETHLEHEM...NICHOLASVILLE...GRATIS...CAMPTON...
RUSSELL...BOLD SPRINGS...FORT YARGO STATE PARK...HARBIN AND WINDSOR.

LAT...LON 3402 8362 3392 8362 3391 8364 3389 8363
      3389 8362 3382 8362 3384 8398 3395 8398
TIME...MOT...LOC 2315Z 264DEG 19KT 3391 8387

DJN
Special weather statement, Aug 18, 7:38 PM EDT, 4 hours 14 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
738 PM EDT TUE AUG 18 2015

GAZ113-190015-
TOOMBS GA-
738 PM EDT TUE AUG 18 2015

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN TOOMBS COUNTY UNTIL
815 PM EDT...

AT 737 PM EDT...A STRONG THUNDERSTORM WAS NEAR LYONS...MOVING
NORTHEAST AT 20 MPH.

  HAZARD...WINDS UP TO 40 MPH...PEA SIZED HAIL...FREQUENT LIGHTNING
           AND HEAVY RAIN.

  IMPACT...PEOPLE OUTDOORS SHOULD SEEK SHELTER IMMEDIATELY. EXPECT
           MINOR DAMAGE TO TREE LIMBS AND BLOWING AROUND OF
           LIGHT...UNSECURED OBJECTS. ELECTRICAL APPLIANCES SHOULD
           NOT BE USED UNLESS IN AN EMERGENCY. LOCALIZED FLOODING IN
           LOW LYING AND POOR DRAINAGE AREAS IS ALSO LIKELY.
           MOTORISTS SHOULD SLOW DOWN AND BE PREPARED FOR POSSIBLE
           LOSS OF CONTROL DUE TO HYDROPLANING. WHEN WATER COVERS
           THE ROAD REMEMBER...TURN AROUND...DO NOT DROWN.

SOME LOCATIONS IN THE PATH OF THIS STORM INCLUDE
LYONS...SANTA CLAUS...PONDEROSA AND OHOOPEE.

LAT...LON 3214 8220 3209 8220 3209 8227 3214 8234
      3229 8230 3231 8224 3224 8221 3221 8221
      3216 8218
TIME...MOT...LOC 2337Z 227DEG 16KT 3218 8225
Local storm report, Aug 18, 8:04 PM EDT, 3 hours 48 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
804 PM EDT TUE AUG 18 2015

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

0800 PM     FLASH FLOOD      1 N SALEM               33.74N  83.39W
08/18/2015                   OCONEE             GA   PUBLIC

            GREENBRIAR CREEK IS OVERFLOWING ITS BANKS NEAR THE
            GEORGIA NATURE CENTER.

&&

EVENT NUMBER FFC1500643

NLIST
Special weather statement, Aug 18, 8:36 PM EDT, 3 hours 16 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
836 PM EDT TUE AUG 18 2015

GAZ053>055-057-190115-
HENRY GA-CLAYTON GA-COWETA GA-FAYETTE GA-
836 PM EDT TUE AUG 18 2015

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN HENRY...SOUTHERN
CLAYTON...NORTHEASTERN COWETA AND FAYETTE COUNTIES UNTIL 915 PM
EDT...

AT 835 PM EDT...A LINE OF STRONG THUNDERSTORMS WAS EXTENDING FROM
NEAR FAYETTEVILLE TO NEAR EAST NEWNAN...AND MOVING EAST AT 20 MPH.

  HAZARD...WINDS UP TO 40 MPH...FREQUENT LIGHTNING AND HEAVY RAIN.

  IMPACT...PEOPLE OUTDOORS SHOULD SEEK SHELTER IMMEDIATELY. EXPECT
           MINOR DAMAGE TO TREE LIMBS AND BLOWING AROUND OF
           LIGHT...UNSECURED OBJECTS. ELECTRICAL APPLIANCES SHOULD
           NOT BE USED UNLESS IN AN EMERGENCY. LOCALIZED FLOODING IN
           LOW LYING AND POOR DRAINAGE AREAS IS ALSO LIKELY.
           MOTORISTS SHOULD SLOW DOWN AND BE PREPARED FOR POSSIBLE
           LOSS OF CONTROL DUE TO HYDROPLANING. WHEN WATER COVERS
           THE ROAD REMEMBER...TURN AROUND...DO NOT DROWN.

SOME LOCATIONS IN THE PATH OF THESE STORMS INCLUDE
NEWNAN...FAYETTEVILLE...JONESBORO...PEACHTREE CITY...STOCKBRIDGE...
RIVERDALE...HAMPTON...TYRONE...LOVEJOY...SENOIA...SHARPSBURG...
TURIN...WOOLSEY...EAST NEWNAN...IRONDALE...INMAN...THE ATLANTA MOTOR
SPEEDWAY...THOMAS CROSSROADS...BONANZA AND FLIPPEN.

LAT...LON 3354 8445 3350 8417 3340 8422 3335 8435
      3335 8438 3334 8439 3327 8468 3340 8481
TIME...MOT...LOC 0035Z 283DEG 16KT 3348 8445 3337 8474
Local storm report, Aug 18, 11:34 PM EDT, 18 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 18, 8:36 PM EDTSpecial Weather StatementFFCCoweta, Fayette39 min
Aug 19, 12:07 AM EDTRiver Flood WarningFFCGwinnett, Walton7 days
Aug 19, 12:10 PM EDTSpecial Weather StatementFFCBartow, Floyd, Gordon35 min
Aug 19, 2:09 PM EDTSpecial Weather StatementFFCClarke, Oconee51 min
Aug 19, 2:54 PM EDTSpecial Weather StatementFFCMorgan, Oconee51 min
Aug 19, 3:19 PM EDTSpecial Weather StatementFFCBanks, Hall41 min
Aug 19, 3:53 PM EDTSpecial Weather StatementFFCBarrow52 min
Aug 19, 4:44 PM EDTSpecial Weather StatementFFCHancock, Warren46 min
Aug 19, 4:48 PM EDTSpecial Weather StatementFFCDeKalb, Rockdale42 min
Aug 19, 4:51 PM EDTSpecial Weather StatementFFCBartow, Cherokee39 min
Aug 19, 5:09 PM EDTSpecial Weather StatementFFCDouglas51 min
Aug 19, 5:31 PM EDTSpecial Weather StatementFFCWarren44 min
Aug 19, 5:35 PM EDTSpecial Weather StatementFFCBarrow40 min
Aug 19, 5:53 PM EDTSpecial Weather StatementFFCFulton52 min
Aug 19, 6:00 PM EDTSpecial Weather StatementFFCGilmer, Gordon, Murray45 min
Aug 19, 6:02 PM EDTFlash Flood WarningFFCCarroll6 hr
Aug 19, 6:14 PM EDTFlash Flood WarningFFCDouglas, Fulton6 hr
Aug 19, 6:22 PM EDTSpecial Weather StatementFFCCherokee, Dawson, Forsyth38 min
Aug 19, 6:48 PM EDTSpecial Weather StatementFFCChattooga, Gordon42 min
Aug 19, 7:33 PM EDTSpecial Weather StatementFFCMurray, Whitfield57 min

Nearby

Areal Flood Warnings in Georgia, 2015Every areal flood warning in 2015

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.