Special Weather Statement, NWS Atlanta, GA

Area Forecast Discussion
National Weather Service Peachtree City GA
349 PM EDT Mon Jun 21 2021

.SHORT TERM /Tonight through Tuesday Night/...
Ample moisture and approaching upper level trough will continue to
promote shower and thunderstorm development this afternoon and
evening. Although some of these storms could become strong, the
main forecast concern continues to be the overnight frontal
passage and accompanying storms. Periods of moderate to heavy rain
can be expected, and a Flash Flood Watch remains in place for
far north Georgia. Although QPF amounts are lower than previously
forecast (1 to 2.5 inches), there remains a high enough flash
flood threat to keep the Watch in effect. Latest model solutions
show an earlier end to the precip over the Watch area, and so as a
result, the Watch is now in effect until 18Z/2pm instead of
Tuesday night. At this time, QPF amounts over the remaining CWA
are not high enough to consider expanding the Watch.

SPC has a Marginal Risk for severe storms for the overnight
activity through north Georgia, and for tomorrow the Marginal Risk
shifts to the southern half of the CWA. HiRes models still show a
marginally unstable and weakly sheared environment, with the main
concern damaging winds and heavy rain. A low but non-zero tornado
threat is also present.

Behind the front a cooler and drier air mass returns to the state.
Min temperatures will be 7-10 degrees cooler Tuesday Night/
Wednesday morning with north Georgia waking up to lows in the 50s.
Highs Tuesday will top out in the upper 70s and low 80s, though
much of that is the rain/cloud cover influence.

31

.LONG TERM /Wednesday through Monday/...

No changes have been made to the extended. Models seem consistent in
the overall pattern. A front stalls across central Georgia mid week
with some brief drying over the north. By the end of the week...a
return to a typical diurnal convective pattern. By Sunday into
Monday...increased southerly flow ahead of the upper trough so
pops have been raised a bit to likely. The previous discussion is
included below.

PREV DISCUSSION... /Issued 513 AM EDT Mon Jun 21 2021/
The aforementioned short term front and enhanced moisture axis
looks to stall near central GA for Wed/Thu with weak ridging
across the north so have maintained some pops primarily across
central GA. With a stronger low level southerly advection of Gulf
moisture kicking in for Friday through the weekend, we can expect
a shift back to more widespread convection mainly diurnally
enhanced. GFS indicates possible aided forcing near the north with
weak disturbance along main trough energy to the northwest for
Friday into Saturday.

Temps look to stay slightly below climo norms through period with
coolest days Wed/Thu prior to increased southerly fetch.

41/Baker

&&

.AVIATION...
18Z Update...
SCT MVFR remains in the area, particularly where showers and a few
isolated thunderstorms have continued over the last few hours.
What clearing occurs this evening won't last, with MVFR and
possible IFR expected to develop by 05-09Z. Front will push
through ATL area early Tuesday, with best rain chances after 08Z,
and best thunder generally 10-14Z. Improvement to VFR expected
thereafter. Winds will shift from the SW to the NW after front
moves through Tuesday around 18-19Z. Gusts to 20-25kt possible
in/near storms, otherwise generally 12kt or less.

//ATL Confidence...18Z Update...
Medium on timing of storms, ceilings.
High on all other elements.

31

&&

.PRELIMINARY POINT TEMPS/POPS...
Athens          70  81  63  84 /  70  80  30  20
Atlanta         70  78  63  84 /  80  80  30  20
Blairsville     65  75  54  78 /  80  80  10  10
Cartersville    69  79  58  84 /  90  80  10  10
Columbus        72  80  68  85 /  80  80  50  50
Gainesville     70  79  62  81 /  80  80  20  10
Macon           71  80  67  86 /  70  90  50  50
Rome            70  81  59  86 /  90  70   5  10
Peachtree City  70  78  63  84 /  70  80  30  30
Vidalia         73  80  70  84 /  60  90  60  70

&&

.FFC WATCHES/WARNINGS/ADVISORIES...
Flash Flood Watch from 2 AM EDT Tuesday through Tuesday evening
for the following zones: Bartow...Catoosa...Chattooga...
Cherokee...Dade...Dawson...Fannin...Floyd...Gilmer...Gordon...
Lumpkin...Murray...Pickens...Polk...Towns...Union...Walker...
White...Whitfield.

&&

SHORT TERM...31
LONG TERM....41
AVIATION...31

Hazardous Weather Outlook
National Weather Service Peachtree City GA
331 PM EDT Mon Jun 21 2021

GAZ001>009-011>016-019>025-027-030>039-041>062-066>076-078>086-
089>098-102>113-221945-
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-
331 PM EDT Mon Jun 21 2021

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

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

Afternoon showers and thunderstorms will continue this afternoon
and tonight. Additional storms will move into the state from the
northwest tonight accompanying a frontal boundary. Some storms
could be strong with locally heavy rainfall, gusty winds, and
frequent lightning. As the cold front gets closer tonight, some
isolated severe storms with strong to damaging winds could occur
across the far north.

A Flash Flood Watch is in effect tonight into Tuesday across
portions of north Georgia, where additional heavy rainfall on top
of saturated soils from recent rain could exacerbate the flood
potential.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday...

The Flash Flood Watch will continue into Tuesday across portions
of north Georgia, where additional heavy rainfall on top of
saturated soils from recent rain could exacerbate the flood
potential.

The chance for thunderstorms will continue Tuesday as the cold
front pushes southward across the area. Some storms could be strong
with locally heavy rainfall, gusty winds, and frequent lightning.
Isolated severe storms with strong to damaging winds are possible
in the afternoon and evening across portions of central Georgia.

The chance for thunderstorms looks to be primarily across central
Georgia for Wednesday and Thursday, then return to both north and
central Georgia for Friday through the weekend. Some isolated
strong to severe storms cannot be ruled out.

.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
434 PM EDT Mon Jun 21 2021

GAZ011-019-212100-
Chattooga GA-Floyd GA-
434 PM EDT Mon Jun 21 2021

...SIGNIFICANT WEATHER ADVISORY FOR CHATTOOGA AND FLOYD COUNTIES
UNTIL 500 PM EDT...

At 433 PM EDT...a strong thunderstorm was over Chattoogaville, or 8
miles east of Little River Canyon National Preserve...moving
northeast at 30 mph.

  HAZARD...40 to 50 mph wind...up to penny sized hail and frequent
           cloud to ground lightning.

  IMPACT...Expect minor damage to tree limbs and blowing around of
           light...unsecured objects.

Some locations in the path of this storm include
Rome, Summerville, Trion, Shannon, Lyerly, Menlo, Pinson, Subligna,
Tidings, Armuchee, Lake Marvin, Coosa, Cloudland, Berryton,
Chattoogaville, Everett Springs, James H. Floyd State Park and
Holland.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People outdoors should seek shelter immediately. If you can hear
thunder...you are close enough to be struck by lightning.

LAT...LON 3459 8507 3454 8506 3454 8509 3447 8509
      3446 8511 3443 8509 3441 8511 3440 8503
      3439 8502 3439 8501 3437 8501 3417 8538
      3419 8544 3459 8553
TIME...MOT...LOC 2033Z 242DEG 27KT 3433 8548

HAIL...0.75IN
WIND...50MPH

Special Weather Statement
National Weather Service Peachtree City GA
510 PM EDT Mon Jun 21 2021

GAZ002-004-011-012-019-020-212145-
Chattooga GA-Whitfield GA-Walker GA-Gordon GA-Bartow GA-Floyd GA-
510 PM EDT Mon Jun 21 2021

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN CHATTOOGA...SOUTHERN
WHITFIELD...SOUTHEASTERN WALKER...GORDON...NORTHWESTERN BARTOW AND
NORTHEASTERN FLOYD COUNTIES UNTIL 545 PM EDT...

At 510 PM EDT...a strong thunderstorm was over Armuchee, or 10 miles
north of Rome...moving northeast at 35 mph.

  HAZARD...40 to 50 mph wind...up to penny sized hail...frequent
           cloud to ground lightning 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
Rome, Calhoun, Summerville, Adairsville, Trion, Resaca, Plainville,
Shannon, Ranger, Sonoraville, Pinson, Oostanaula, Subligna, Tidings,
Redbud, Armuchee, Lake Marvin, Tilton, Audubon and Berryton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People outdoors should seek shelter immediately. If you can hear
thunder...you are close enough to be struck by lightning. Motorists
should slow down and be prepared for possible loss of control due to
hydroplaning.

LAT...LON 3467 8494 3466 8492 3468 8490 3468 8489
      3466 8489 3467 8490 3465 8492 3462 8491
      3462 8486 3461 8486 3461 8478 3447 8468
      3432 8504 3433 8534 3454 8544
TIME...MOT...LOC 2110Z 239DEG 31KT 3441 8514

HAIL...0.75IN
WIND...50MPH

Special Weather Statement
National Weather Service Peachtree City GA
533 PM EDT Mon Jun 21 2021

GAZ001>004-212200-
Whitfield GA-Catoosa GA-Walker GA-Dade GA-
533 PM EDT Mon Jun 21 2021

...SIGNIFICANT WEATHER ADVISORY FOR WHITFIELD...CATOOSA...NORTHERN
WALKER AND NORTHEASTERN DADE COUNTIES UNTIL 600 PM EDT...

At 533 PM EDT...a strong thunderstorm was over Tunnel Hill, or near
Dalton...moving northeast at 40 mph.

  HAZARD...40 to 50 mph wind...up to penny sized hail...frequent
           cloud to ground lightning 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
Dalton, Ringgold, Trenton, Fort Oglethorpe, Rossville, Chickamauga,
Varnell, Lookout Mountain, Tunnel Hill, Cohutta, Blue Spring,
Fairview, Beaverdale, Chattanooga  Valley, Hooker, Rock Spring,
Noble, Lakeview, Wood Station and Indian Springs.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People outdoors should seek shelter immediately. If you can hear
thunder...you are close enough to be struck by lightning. Motorists
should slow down and be prepared for possible loss of control due to
hydroplaning.

LAT...LON 3499 8481 3497 8481 3492 8484 3487 8482
      3486 8484 3484 8486 3483 8485 3481 8486
      3475 8495 3472 8504 3473 8520 3480 8528
      3485 8548 3487 8551 3498 8544
TIME...MOT...LOC 2133Z 224DEG 33KT 3485 8502

HAIL...0.75IN
WIND...50MPH

Special Weather Statement
National Weather Service Peachtree City GA
542 PM EDT Mon Jun 21 2021

GAZ012-013-020-021-212215-
Cherokee GA-Gordon GA-Bartow GA-Pickens GA-
542 PM EDT Mon Jun 21 2021

...SIGNIFICANT WEATHER ADVISORY FOR CHEROKEE...SOUTHEASTERN GORDON...
EASTERN BARTOW AND PICKENS COUNTIES UNTIL 615 PM EDT...

At 542 PM EDT...a strong thunderstorm was near Sutallee, or 8 miles
east of Cartersville...moving northeast at 35 mph.

  HAZARD...40 to 50 mph wind...up to penny sized hail...frequent
           cloud to ground lightning 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
Canton, Cartersville, Jasper, Woodstock, Holly Springs, Emerson, Ball
Ground, Nelson, White, Waleska, Talking Rock, Cassville, Buffington,
Fairmount, Hickory Flat, Sequoyah Lake, Kellogg Creek, Red Top
Mountain State Park, Talmadge and Lathemtown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People outdoors should seek shelter immediately. If you can hear
thunder...you are close enough to be struck by lightning. Motorists
should slow down and be prepared for possible loss of control due to
hydroplaning.

LAT...LON 3447 8432 3447 8426 3429 8426 3415 8439
      3408 8452 3408 8470 3414 8483 3430 8489
      3445 8470 3455 8449 3455 8448 3456 8447
      3455 8447 3456 8443 3455 8442 3455 8437
      3456 8437 3456 8435
TIME...MOT...LOC 2142Z 236DEG 31KT 3418 8465

HAIL...0.75IN
WIND...50MPH

Special Weather Statement
National Weather Service Peachtree City GA
547 PM EDT Mon Jun 21 2021

GAZ004-005-007-012-013-212215-
Gilmer GA-Whitfield GA-Gordon GA-Pickens GA-Murray GA-
547 PM EDT Mon Jun 21 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN GILMER...
SOUTHEASTERN WHITFIELD...GORDON...NORTHWESTERN PICKENS AND MURRAY
COUNTIES UNTIL 615 PM EDT...

At 547 PM EDT...a strong thunderstorm was over Redbud, or near
Calhoun...moving northeast at 35 mph.

  HAZARD...40 to 50 mph wind...up to penny sized hail...frequent
           cloud to ground lightning 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
Dalton, Calhoun, Chatsworth, Ellijay, Eton, East Ellijay, Resaca,
Fairmount, Ranger, Carters, Sonoraville, Talona, Tails Creek,
Ramhurst, Redbud, Tilton, Audubon, Sugar Valley, Oakman and
Mountaintown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People outdoors should seek shelter immediately. If you can hear
thunder...you are close enough to be struck by lightning. Motorists
should slow down and be prepared for possible loss of control due to
hydroplaning.

LAT...LON 3467 8442 3455 8449 3445 8470 3440 8477
      3440 8484 3442 8492 3450 8503 3473 8501
      3475 8495 3483 8483 3486 8470
TIME...MOT...LOC 2147Z 235DEG 32KT 3451 8484

HAIL...0.75IN
WIND...50MPH

Special Weather Statement
National Weather Service Peachtree City GA
556 PM EDT Mon Jun 21 2021

GAZ014-015-021>023-032>034-212230-
Hall GA-Dawson GA-North Fulton GA-Cobb GA-Cherokee GA-Forsyth GA-
Gwinnett GA-Lumpkin GA-
556 PM EDT Mon Jun 21 2021

...SIGNIFICANT WEATHER ADVISORY FOR HALL...SOUTHEASTERN DAWSON...
NORTH FULTON...NORTHEASTERN COBB...SOUTHEASTERN CHEROKEE...FORSYTH...
NORTHWESTERN GWINNETT AND SOUTHEASTERN LUMPKIN COUNTIES UNTIL 630 PM
EDT...

At 555 PM EDT...a strong thunderstorm was over Milton, or 8 miles
southwest of Cumming...moving northeast at 25 mph.

  HAZARD...40 to 50 mph wind...up to penny sized hail...frequent
           cloud to ground lightning 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
Gainesville, Cumming, Dawsonville, Sandy Springs, Roswell, Johns
Creek, Alpharetta, Milton, Duluth, Woodstock, Sugar Hill, Suwanee,
Buford, Flowery Branch, Oakwood, Rest Haven, Free Home, Dougherty,
Candler and Drew.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People outdoors should seek shelter immediately. If you can hear
thunder...you are close enough to be struck by lightning. Motorists
should slow down and be prepared for possible loss of control due to
hydroplaning.

LAT...LON 3398 8423 3400 8446 3408 8452 3415 8439
      3429 8426 3442 8414 3452 8387 3426 8366
TIME...MOT...LOC 2155Z 229DEG 23KT 3414 8427

HAIL...0.75IN
WIND...50MPH