Special Weather Statement, NWS Atlanta, GA

Area Forecast Discussion...UPDATED
National Weather Service Peachtree City GA
822 PM EDT Tue Jul 20 2021

...Updated for 00z Aviation Discussion...

&&

.PREV DISCUSSION... /Issued 314 PM EDT Tue Jul 20 2021/

SHORT TERM /Tonight through Wednesday Night/...
Showers and isolated thunderstorms across the area this afternoon
will continue through the late evening hours before diminishing
overnight. Instability is marginal this afternoon and shear values
are almost non existent. The biggest issue are the precipitable
water number values. Seeing 1.75 to 2.06in values through the
short term so while we are not expecting much in the way of severe
storms...any one of these storms could drop a lot of water very
fast. Since we have already seen quite a bit of rain over North GA
over the past 24-36 hours (0.5-2.5 almost 3 inches) any
additional rainfall could cause some flooding across the area.
right now our biggest concern is for N GA and some portions of
west central GA which is why we extended the flood watch earlier
today to include those areas. Expecting another round of showers
and thunderstorms Wed afternoon with the same similar parameters
as today so another flood watch may be needed.

With all the precip occurring daytime high temps will be lower
than normal with highs mainly in the lower to middle 80s. and lows
in the 60s to near 70.

01

LONG TERM /Thursday through Tuesday/...
Broad/persistent upr trough stretching from the Arklatex to the
central Appalachians will finally begin to break apart by Thursday
leaving the area in a relatively drier NW flow as a weak ridge
attempts to build in from the west. Convection on Thursday/Friday
appears to be confined to the far southern portions of the state
with just an isold storm or two driven by daytime heating expected
across north & central GA. Will have to monitor positioning of
upr ridge to our west as northeast periphery could affect area
with deeper moisture and energy support for better coverage of
convection. POPs will likely continue to favor NBM/Superblend
solutions.

In response to the upr ridge and expected "drier" conditions,
temps will warm up - approaching seasonal levels for late July by
this weekend.

Early next week, upr ridge appears to strengthen over the Central
Plains/Midwest regions, leaving the area again in a typical "hot"
summer-time pattern with scattered afternoon/evening diurnally-
driven showers and thunderstorms.

DJN.83

HYDROLOGY...

There is a slight risk of excessive rainfall for north GA today
and as such, a Flash Flood Watch has been issued for portions of
far NE Georgia. Main reasoning for this watch is given consistent
low- level upslope forcing amid a favorable saturated environment,
evident by HRRR soundings, it should not take much instability to
see an uptick in rainfall rates given the warm rain processes.
New rainfall amounts of 1 to 2" are possible across the watch
area, with locally higher amounts. This area has recently received
between 1 to 2 inches of rain with locally higher amounts of 2.5+
inches. With PWATS approaching 2"+ over much of the CWA and given
the slow moving low and persistent southwesterly low level flow
into the area, there remains the potential for expansion pending
future forecast packages.

.AVIATION...
00Z Update...
Areas of moderate to heavy rain and thunderstorms are underway
this evening across portions of north and central GA. Have VCSH at
all TAF sites until 06z, with TEMPO groups at KATL and metro
sites from 00z-02z for TSRA. Winds will be light and variable
overnight, with cigs dropping to MVFR around 04z-06z and then to
IFR around 06z-08z. Pockets of LIFR will be possible, but
confidence was too low to include in the TAFs. Winds will be W to
SW at 4-7 kts during the daytime hours of Wednesday. Wednesday
afternoon will bring another round of scattered showers and
thunderstorms.

//ATL Confidence...00Z Update...
Medium confidence on timing of lowering cigs.
High confidence on all other elements.

Martin

&&

.PRELIMINARY POINT TEMPS/POPS...
Athens          67  84  70  90 /  60  40  30  40
Atlanta         69  83  71  87 /  60  60  40  50
Blairsville     63  82  63  84 /  40  40  20  30
Cartersville    68  84  69  89 /  60  50  30  40
Columbus        71  85  72  89 /  50  60  30  50
Gainesville     67  83  69  88 /  50  40  30  40
Macon           71  86  71  91 /  60  50  30  50
Rome            69  85  70  90 /  50  50  30  40
Peachtree City  69  83  70  87 /  70  60  40  50
Vidalia         72  86  73  90 /  40  50  30  40

&&

.FFC WATCHES/WARNINGS/ADVISORIES...
Flash Flood Watch until 10 PM EDT this evening for the following
zones: Banks...Barrow...Bartow...Carroll...Catoosa...Chattooga...
Cherokee...Clarke...Clayton...Cobb...Coweta...Dade...Dawson...
DeKalb...Douglas...Fannin...Fayette...Floyd...Forsyth...Gilmer...
Gordon...Gwinnett...Hall...Haralson...Heard...Henry...Jackson...
Lumpkin...Madison...Morgan...Murray...Newton...North Fulton...
Oconee...Oglethorpe...Paulding...Pickens...Polk...Rockdale...
South Fulton...Towns...Union...Walker...Walton...White...
Whitfield.

&&

SHORT TERM...Martin
LONG TERM....DJN.83
AVIATION...Martin

Hazardous Weather Outlook
National Weather Service Peachtree City GA
1149 AM EDT Tue Jul 20 2021

GAZ001>009-011>016-019>025-027-030>039-041>062-066>076-078>086-
089>098-102>113-211600-
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-
1149 AM EDT Tue Jul 20 2021

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

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

Slow moving bands of moderate to locally heavy rain will continue
across the state today, which could lead to localized flash
flooding. A Flash Flood Watch is in effect for north Georgia and
portions of west central Georgia until 10 PM EDT this evening.

Numerous thunderstorms are expected across north and central
Georgia this afternoon and evening. A few storms could become
strong and capable of producing very heavy rain, gusty winds, and
frequent lightning.

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

Scattered to thunderstorms are possible across north and central
Georgia Wednesday through Monday, mainly in the afternoon and
evening. A few storms could become strong and capable of producing
locally heavy rain heavy rain, gusty winds and frequent
lightning.

.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.  Please relay any information about observed
severe weather to the NWS while following all local, state, and
CDC guidelines.

Special Weather Statement
National Weather Service Peachtree City GA
501 PM EDT Tue Jul 20 2021

GAZ039-051-202145-
Taliaferro GA-Wilkes GA-
501 PM EDT Tue Jul 20 2021

...SIGNIFICANT WEATHER ADVISORY FOR TALIAFERRO AND SOUTHERN WILKES
COUNTIES UNTIL 545 PM EDT...

At 500 PM EDT...a strong thunderstorm was near Lyneville, or near
Crawfordville. This storm was nearly stationary.

  HAZARD...Heavy rain.

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

Some locations in the path of this storm include
Washington, Aonia, Ficklin, Lundberg, Rocky Creek Fire Dept.,
Lyneville, Sandy Cross and Holliday Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

LAT...LON 3366 8251 3365 8252 3364 8256 3365 8258
      3363 8258 3364 8259 3363 8261 3363 8262
      3362 8262 3361 8265 3360 8265 3360 8267
      3359 8269 3362 8293 3368 8295 3377 8256
      3364 8248
TIME...MOT...LOC 2100Z 270DEG 2KT 3365 8288

Special Weather Statement
National Weather Service Peachtree City GA
540 PM EDT Tue Jul 20 2021

GAZ066-067-069-078-079-202215-
Harris GA-Upson GA-Troup GA-Meriwether GA-Talbot GA-
540 PM EDT Tue Jul 20 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN HARRIS...
NORTHWESTERN UPSON...SOUTHEASTERN TROUP...SOUTHERN MERIWETHER AND
NORTHWESTERN TALBOT COUNTIES UNTIL 615 PM EDT...

At 540 PM EDT...a strong thunderstorms was along a line extending
from Baughs Crossroads to near Woodland...and moving northeast at 20
mph.

  HAZARD...Winds up to 40 mph and heavy rain.

  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.

Some locations in the path of these storms include
LaGrange, Thomaston, Hamilton, Greenville, Manchester, Pine Mountain,
Woodbury, Waverly Hall, Warm Springs, Woodland, Sunset Village,
Lincoln Park, F.d. Roosevelt State Park, Mountville, Louise, Flint
Hill, Odessadale, Sprewell Bluff State Park, Stovall and Sunnyside.

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 3311 8506 3306 8472 3299 8453 3297 8452
      3297 8451 3298 8450 3291 8429 3264 8461
      3285 8512
TIME...MOT...LOC 2140Z 218DEG 19KT 3292 8504 3276 8460

WIND...40MPH

Special Weather Statement
National Weather Service Peachtree City GA
555 PM EDT Tue Jul 20 2021

GAZ082-083-094-095-202230-
Peach GA-Bibb GA-Houston GA-Twiggs GA-
555 PM EDT Tue Jul 20 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN PEACH...SOUTHEASTERN
BIBB...NORTHEASTERN HOUSTON AND NORTHWESTERN TWIGGS COUNTIES UNTIL
630 PM EDT...

At 555 PM EDT...a strong thunderstorm was over Middle Georgia
Regional Airport, or 10 miles south of Macon...moving east at 25 mph.

  HAZARD...Winds up to 40 mph and heavy rain.

  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.

Some locations in the path of this storm include
Macon, Warner Robins, Centerville, Byron, Robins Air Force Base,
Marion, Bullard, Rutland, Fitzpatrick, Huber, Dry Branch, Skipperton,
Elberta, Franklinton and Middle Georgia Regional Airport.

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 3259 8376 3269 8377 3269 8374 3272 8376
      3271 8377 3274 8377 3285 8354 3275 8342
      3260 8344
TIME...MOT...LOC 2155Z 253DEG 24KT 3268 8366

WIND...40MPH

Special Weather Statement
National Weather Service Peachtree City GA
741 PM EDT Tue Jul 20 2021

GAZ068-070-210030-
Lamar GA-Pike GA-
741 PM EDT Tue Jul 20 2021

...SIGNIFICANT WEATHER ADVISORY FOR LAMAR AND SOUTHERN PIKE COUNTIES
UNTIL 830 PM EDT...

At 741 PM EDT...a strong thunderstorm was over Barnesville...moving
east at 10 mph.

  HAZARD...Heavy rain.

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

Some locations in the path of this storm include
Barnesville, Zebulon, Milner, Molena, Meansville, Aldora, Goggins,
Lifsey Springs, Piedmont, Johnstonville and Redbone.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

LAT...LON 3308 8444 3313 8404 3299 8405 3299 8429
      3300 8430 3299 8430 3299 8449 3298 8450
      3298 8453
TIME...MOT...LOC 2341Z 267DEG 7KT 3304 8415

Special Weather Statement
National Weather Service Peachtree City GA
757 PM EDT Tue Jul 20 2021

GAZ074-085-210045-
Washington GA-Johnson GA-
757 PM EDT Tue Jul 20 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN WASHINGTON AND
NORTHERN JOHNSON COUNTIES UNTIL 845 PM EDT...

At 757 PM EDT...a strong thunderstorm was near Tuckers Crossroad, or
near Wrightsville...moving east at 15 mph.

  HAZARD...Heavy rain.

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

Some locations in the path of this storm include
Wrightsville, Harrison, Riddleville, New Home, Donovan and Pringle.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

LAT...LON 3271 8296 3275 8294 3276 8296 3280 8295
      3282 8297 3284 8297 3294 8254 3292 8251
      3283 8252 3279 8248 3273 8247
TIME...MOT...LOC 2357Z 266DEG 14KT 3276 8283

Special Weather Statement
National Weather Service Peachtree City GA
848 PM EDT Tue Jul 20 2021

GAZ019-210130-
Floyd GA-
848 PM EDT Tue Jul 20 2021

...SIGNIFICANT WEATHER ADVISORY FOR FLOYD COUNTY UNTIL 930 PM EDT...

At 847 PM EDT...a strong thunderstorm was over Rome...moving
southwest at 10 mph.

  HAZARD...Heavy rain.

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

Some locations in the path of this storm include
Rome, Shannon, Pinson, Coosa and Lindale.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

LAT...LON 3440 8504 3440 8503 3439 8502 3439 8501
      3435 8501 3435 8502 3431 8502 3419 8516
      3419 8529 3428 8535
TIME...MOT...LOC 0047Z 054DEG 11KT 3424 8519