Flash Flood Warning 36, NWS Atlanta, GA

721 
WGUS72 KFFC 300148
FFSFFC

Flash Flood Statement
National Weather Service Peachtree City GA
948 PM EDT Tue Aug 29 2023

GAC067-089-117-121-135-300800-
/O.CON.KFFC.FF.W.0036.000000T0000Z-230830T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cobb GA-DeKalb GA-Forsyth GA-Fulton GA-Gwinnett GA-
948 PM EDT Tue Aug 29 2023

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 4 AM EDT WEDNESDAY 
FOR EAST CENTRAL COBB, NORTHWESTERN DEKALB, SOUTH CENTRAL FORSYTH, 
EAST CENTRAL FULTON AND NORTHWESTERN GWINNETT COUNTIES...

At 948 PM EDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 3 and 5 inches of rain have 
fallen. Additional rainfall amounts up to 0.5 inches are possible in 
the warned area. Flash flooding is ongoing or expected to begin 
shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar.

IMPACT...Flash flooding of small creeks and streams, urban areas,
         highways, streets and underpasses as well as other poor
         drainage and low-lying areas.

Some locations that will experience flash flooding include...
  Atlanta, Marietta, Lawrenceville, Peachtree Corners, Sandy 
  Springs, Roswell, Johns Creek, Dunwoody, Duluth, Sugar Hill, 
  Suwanee, Lilburn, Chamblee, Norcross, Doraville, Berkeley Lake, 
  Tucker, North Atlanta, Mechanicsville and Brookhaven.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 3394 8449 3407 8418 3411 8410 3401 8394
      3388 8415 3382 8444

FLASH FLOOD...RADAR INDICATED

$$

SM

614 
WGUS72 KFFC 300631 RRA
FFSFFC

Flash Flood Statement
National Weather Service Peachtree City GA
231 AM EDT Wed Aug 30 2023

GAC067-089-117-121-135-300641-
/O.CAN.KFFC.FF.W.0036.000000T0000Z-230830T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cobb GA-DeKalb GA-Forsyth GA-Fulton GA-Gwinnett GA-
231 AM EDT Wed Aug 30 2023

...FLASH FLOOD WARNING IS CANCELLED FOR EAST CENTRAL COBB, 
NORTHWESTERN DEKALB, SOUTH CENTRAL FORSYTH, EAST CENTRAL FULTON AND 
NORTHWESTERN GWINNETT COUNTIES...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

LAT...LON 3394 8449 3407 8418 3411 8410 3401 8394
      3388 8415 3382 8444

$$

Area Forecast Discussion
National Weather Service Peachtree City GA
744 PM EDT Tue Aug 29 2023

...New 00Z Aviation Discussion...

.SHORT TERM...
(This afternoon through Wednesday)
Issued at 248 PM EDT Tue Aug 29 2023

Main Forecast Points:

-Scattered to widespread storms expected through the evening today
 (potentially lingering overnight) with locally heavy rainfall and
 isolated damaging wind gusts with any storms that form this
 afternoon.

-'Cooling' trend continues as a result of rain chances and cloud
 cover.

-Slight westward shift in the track of Hurricane Idalia.

Currently...Scattered thunderstorms are ongoing this afternoon
across portions of south-central GA. The stationary boundary that
was bisecting the forecast area has since lifted back northward.
Storms are expected to persist through the evening though may
linger into the overnight hours. With no changes to the juicy
environment, locally heavy rainfall and damaging wind gusts will
the primary hazards with any storms that develop today (similar to
yesterday). SBCAPE values are 3000-4000 J/kg, DCAPE values are
700-900 J/kg and PWATs are well over 2"...so certainly plenty of
fuel for storms to work with. Coverage of showers and storms may
be slightly less overnight but more rain will be on the way as we
start to feel the impacts from the outer rainbands of Hurricane
Idalia overnight.

Latest NHC Advisory has Hurricane Idalia making landfall along the
coastline of "Big Bend" area of Florida around sunrise Wednesday
morning. As this occurs, outer banding will begin to approach
portions of Middle Georgia overnight tonight and early tomorrow
(Wednesday) morning. Per this latest advisory, there was a slight
westward shift in the track of Hurricane Idalia thus impacts from
winds and heavy rain have been expanded further north and west
into the forecast area, encompassing more of east- central
Georgia. After making landfall, Idalia will steadily move into
southeast Georgia by the afternoon and evening hours on Wednesday.
With the track of Hurricane Idalia trending slightly more
westward, elected to expand the Flood Watch (again) another tier
of counties north and westward. The HREF LPMM (ensemble
probability mean) was also a player in this decision and has done
well with the predictability in QPF totals. Forecast storm total
rainfall has also increased to now be 4 to 8 inches across
southeast Georgia with pockets of rainfall up to 10" possible.

Sustained winds across portions of southeast Georgia are forecast
to range from 20-30 mph with gusts as high as 45 mph from late
Wednesday morning through Wednesday night. A Tropical Storm
Warning is now in effect for Toombs, Montgomery, Wheeler,
Telfair, Dodge, Wilcox, and Crisp counties. In addition, a
Tropical Storm Watch has been issued to the north for Emanuel,
Treutlen, Laurens, Johnson, Bleckley, Pulaski, and Dooly counties.
A tornado threat will also exist within the rainbands as Idalia
moves onshore and approaches our area. As we have seen over the
past 24-48 hrs, any adjustment of the track further to the west
may increase potential impacts for portions of Middle Georgia.
Changes may be forthcoming following the next NHC Advisory.

Thanks to cloud cover and rainfall temperatures tomorrow will be
noticeably cooler...yay. Highs forecast to be in the 70s to low
80s. Low temperatures forecast to be in the 60s.

07

&&

.LONG TERM...
(Thursday morning through next Monday)
Issued at 248 PM EDT Tue Aug 29 2023

After Hurricane Idalia has moved out of the area, we return to a
more seasonal pattern with temperatures running a few degrees below
normal in the mid to low 80s. As the remnants of Idalia stalls off
the coast, it will filter dry air down the spine of the Appalachians
keeping the CWA dry and on the cooler side for the entire extended
forecast. Overnight lows will be in the mid to low 60s and should be
generally very pleasant.

Winds will remain out of the NE through the forecast period with
some gusty winds up to 15kts. There is some significant deviation in
the long term models. Idalia stalls this weekend just off the
Carolina coast and what it does will ultimately dictate the course
of the forecast for early next week (and luckily for me that's just
out of the longer term forecast range).

Vaughn

&&

.AVIATION...
(00Z TAFS)
Issued at 722 PM EDT Tue Aug 29 2023

Current convection will continue into the evening hours. Do expect
a lull in precip until the bands start approaching from the south
by mid morning. During this time, there is definitely potential
for IFR and even LIFR cigs. Winds/wind gusts will also begin to
pick up by mid morning and could gust into the upper 20kt lower
30kt range. Widespread shra expected by mid morning.

//ATL Confidence...00Z Update...
Med confidence all elements.

NListemaa

&&

.PRELIMINARY POINT TEMPS/POPS...
Athens          70  77  67  81 /  70 100  60  30
Atlanta         72  79  66  85 /  70  80  30  20
Blairsville     64  78  59  80 /  70  70  30  30
Cartersville    69  82  63  84 /  70  70  30  20
Columbus        73  80  69  89 /  50  80  30  30
Gainesville     70  79  66  83 /  70  80  40  30
Macon           72  77  69  85 /  50 100  50  20
Rome            70  84  64  87 /  50  60  20  20
Peachtree City  70  79  64  85 /  60  80  30  20
Vidalia         74  79  71  83 /  80 100  80  30

&&

.FFC WATCHES/WARNINGS/ADVISORIES...
Flood Watch from Wednesday morning through late Wednesday night
for GAZ039-050-051-059>062-071>076-080>086-091>098-103>113.

Tropical Storm Watch for GAZ074>076-083-084-092>095-104.

Tropical Storm Warning for GAZ085-086-096>098-105>113.

&&

SHORT TERM...07
LONG TERM....Vaughn
AVIATION...NListemaa

Hazardous Weather Outlook
National Weather Service Peachtree City GA
1201 PM EDT Tue Aug 29 2023

GAZ001>009-011>016-019>025-027-030>039-041>062-066>076-078>086-
089>098-102>113-301615-
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-
1201 PM EDT Tue Aug 29 2023

This Hazardous Weather Outlook is for portions of North and Central Georgia.

.DAY ONE...This Afternoon and Tonight...

Scattered to numerous thunderstorm activity is expected to redevelop
this afternoon and evening. Heavy rainfall will remain the
primary concern with localized flash flooding possible, especially
in north Georgia. A few storms may produce strong wind gusts.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday...

Widespread showers and thunderstorms are expected on Wednesday,
particularly across the southeastern half of the area as Hurricane
Idalia approaches southeast Georgia. The heaviest rainfall totals
associated with this system will be across far southeastern
portions of the area where as much as 3 to 6 inches of rainfall
with locally higher amounts is possible which will lead to
increased flooding potential. Additionally, wind gusts up to 45
mph are possible in far southeastern portions of the area as
Idalia approaches.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not requested but spotters are encouraged
to submit reports of severe weather through the web by going to
weather.gov/atlanta.

Special Weather Statement
National Weather Service Peachtree City GA
718 PM EDT Tue Aug 29 2023

GAZ030-041-292345-
Polk GA-Haralson GA-
718 PM EDT Tue Aug 29 2023

...A strong thunderstorm will impact portions of northwestern
Haralson and western Polk Counties through 745 PM EDT...

At 718 PM EDT, a strong thunderstorm was over Esom Hill, or 7 miles
southwest of Cedartown, moving north at 5 mph.

HAZARD...40 mph wind and heavy rain.

SOURCE...Radar indicated.

IMPACT...Expect minor damage to tree limbs and blowing around of
         light, unsecured objects. Heavy rain may cause temporary
         street flooding especially in poor drainage areas.

Locations impacted include...
Cedartown, Tallapoosa, Etna, and Esom Hill.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People outdoors should seek shelter immediately. Motorists should
slow down and be prepared for possible loss of control due to
hydroplaning.

&&

LAT...LON 3408 8532 3405 8515 3385 8526 3387 8538
      3407 8542 3408 8542
TIME...MOT...LOC 2318Z 192DEG 6KT 3394 8536

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

SM

Special Weather Statement
National Weather Service Peachtree City GA
722 PM EDT Tue Aug 29 2023

GAZ050-300000-
Greene GA-
722 PM EDT Tue Aug 29 2023

...A strong thunderstorm will impact portions of central Greene
County through 800 PM EDT...

At 722 PM EDT, a strong thunderstorm was over Greensboro. This storm
was nearly stationary.

HAZARD...Heavy rain.

SOURCE...Radar indicated.

IMPACT...Heavy rain may cause temporary street flooding especially
         in poor drainage areas.

Locations impacted include...
Greensboro, Union Point, Woodville, White Plains, Siloam, Veazey,
Carey, and Penfield.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Motorists should slow down and be prepared for possible loss of
control due to hydroplaning.

&&

LAT...LON 3346 8327 3351 8328 3354 8327 3356 8330
      3369 8331 3371 8315 3370 8312 3371 8307
      3352 8299 3351 8299
TIME...MOT...LOC 2322Z 349DEG 3KT 3361 8317

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...<30 MPH

SM

Special Weather Statement
National Weather Service Peachtree City GA
740 PM EDT Tue Aug 29 2023

GAZ042-043-053-300015-
Douglas GA-Coweta GA-Carroll GA-
740 PM EDT Tue Aug 29 2023

...A strong thunderstorm will impact portions of southeastern
Carroll, southwestern Douglas and northwestern Coweta Counties
through 815 PM EDT...

At 739 PM EDT, a strong thunderstorm was over Seaton Lake, or 8 miles
southeast of Carrollton. This storm was nearly stationary.

HAZARD...40 mph wind and heavy rain.

SOURCE...Radar indicated.

IMPACT...Expect minor damage to tree limbs and blowing around of
         light, unsecured objects. Heavy rain may cause temporary
         street flooding especially in poor drainage areas.

Locations impacted include...
Carrollton, Whitesburg, Clem, Plant Yates, Byers Crossroads, Abilene,
Treasure Lake, Hannah, Arnco-Sargent, Seaton Lake, and Fairplay.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People outdoors should seek shelter immediately. Motorists should
slow down and be prepared for possible loss of control due to
hydroplaning.

&&

LAT...LON 3365 8484 3342 8482 3342 8501 3343 8502
      3343 8504 3365 8506
TIME...MOT...LOC 2339Z 264DEG 2KT 3352 8495

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

SM

Special Weather Statement
National Weather Service Peachtree City GA
742 PM EDT Tue Aug 29 2023

GAZ033-034-045-300015-
North Fulton GA-DeKalb GA-Gwinnett GA-
742 PM EDT Tue Aug 29 2023

...A strong thunderstorm will impact portions of north central
DeKalb, northwestern Gwinnett and east central Fulton Counties
through 815 PM EDT...

At 741 PM EDT, a strong thunderstorm was over Peachtree Corners. This
storm was nearly stationary.

HAZARD...40 mph wind and heavy rain.

SOURCE...Radar indicated.

IMPACT...Expect minor damage to tree limbs and blowing around of
         light, unsecured objects. Heavy rain may cause temporary
         street flooding especially in poor drainage areas.

Locations impacted include...
Lawrenceville, Peachtree Corners, Sandy Springs, Roswell, Johns
Creek, Dunwoody, Duluth, Suwanee, Lilburn, Norcross, Doraville,
Berkeley Lake, Tucker, and Mechanicsville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People outdoors should seek shelter immediately. Motorists should
slow down and be prepared for possible loss of control due to
hydroplaning.

&&

LAT...LON 3395 8400 3386 8423 3398 8433 3406 8415
      3406 8412 3405 8410 3407 8411 3407 8412
      3408 8411 3409 8409
TIME...MOT...LOC 2341Z 012DEG 0KT 3397 8421

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

SM

Special Weather Statement
National Weather Service Peachtree City GA
754 PM EDT Tue Aug 29 2023

GAZ032-033-045-300030-
North Fulton GA-Cobb GA-DeKalb GA-
754 PM EDT Tue Aug 29 2023

...A strong thunderstorm will impact portions of northwestern DeKalb,
east central Cobb and central Fulton Counties through 830 PM EDT...

At 754 PM EDT, a strong thunderstorm was over Chastain Memorial Park,
or 9 miles east of Marietta, moving northeast at 5 mph.

HAZARD...40 mph wind and heavy rain.

SOURCE...Radar indicated.

IMPACT...Expect minor damage to tree limbs and blowing around of
         light, unsecured objects. Heavy rain may cause temporary
         street flooding especially in poor drainage areas.

Locations impacted include...
Atlanta, Marietta, Sandy Springs, Roswell, Smyrna, Dunwoody,
Chamblee, Doraville, North Atlanta, Mount Bethel, Vinings,
Brookhaven, Bolton, and Chastain Memorial Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People outdoors should seek shelter immediately. Motorists should
slow down and be prepared for possible loss of control due to
hydroplaning.

&&

LAT...LON 3402 8433 3394 8427 3392 8426 3389 8423
      3380 8444 3387 8456
TIME...MOT...LOC 2354Z 204DEG 5KT 3391 8438

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

SM

Special Weather Statement
National Weather Service Peachtree City GA
756 PM EDT Tue Aug 29 2023

GAZ042-043-300030-
Douglas GA-Carroll GA-
756 PM EDT Tue Aug 29 2023

...A strong thunderstorm will impact portions of northeastern Carroll
and western Douglas Counties through 830 PM EDT...

At 756 PM EDT, a strong thunderstorm was over Treasure Lake, or 10
miles northeast of Carrollton, moving northeast at 5 mph.

HAZARD...40 mph wind and heavy rain.

SOURCE...Radar indicated.

IMPACT...Expect minor damage to tree limbs and blowing around of
         light, unsecured objects. Heavy rain may cause temporary
         street flooding especially in poor drainage areas.

Locations impacted include...
Douglasville, Villa Rica, Abilene, Winston, Lake Val-Do-Mar, Treasure
Lake, Hannah, Bill Arp, and Fairplay.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People outdoors should seek shelter immediately. Motorists should
slow down and be prepared for possible loss of control due to
hydroplaning.

&&

LAT...LON 3378 8490 3377 8488 3378 8485 3373 8471
      3359 8480 3359 8481 3357 8481 3356 8483
      3354 8483 3365 8506
TIME...MOT...LOC 2356Z 204DEG 5KT 3367 8493

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

SM