Special Weather Statement, NWS Atlanta, GA

Area Forecast Discussion...UPDATED
National Weather Service Peachtree City GA
837 PM EDT Mon Jul 26 2021

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

&&

.PREV DISCUSSION... /Issued 311 PM EDT Mon Jul 26 2021/

SHORT TERM /Tonight through Tuesday Night/...

Upper trough digging down the Atlantic coast displaces upper
ridging that has been the primary influence over the past weekend.
This, combined with the weak low that that has been meandering
off the FL/GA coast drifting into southeast GA, will bring more
widespread, but still diurnally oriented, convection to the
forecast area over the next 36 hours. With a somewhat tropical
profile to the atmosphere, lapse rates remain weak and instability
limited but precipitable water values are quite hefty, resulting
in limited severe thunderstorm potential but a continuing chance
for localized heavy rain. Not seeing enough larger-scale excessive
rain right now to pinpoint any areas for a Flood Watch. Warm and
humid conditions continue, however cloud cover and precipitation
should keep heat index values below advisory levels through
Tuesday.

20

LONG TERM /Wednesday through Monday/...

Apparent Temperatures (Heat Index Values) may approach 105
degrees for the southern half of the CWA for the end of the week
into the weekend.

CWA remains in NW flow through much of the extended period of the
forecast. Longwave trough that sets up just to the east looks to
retrograde a bit by early next week, driving the ridge back to the
west. At the surface, there should be a weak frontal boundary
across northern GA Wednesday into Thursday. This front should
become diffuse by early Friday. A second frontal boundary should
begin to sag southward across northern portions of the state by
the weekend. This front will remain stationary through early next
week.

Widespread heat index values may approach 105 degrees south of
the Interstate 20 corridor Thursday and Friday. With the
stationary frontal boundary setting up across northern GA for the
weekend, the highest heat index values will likely shift south of
an Athens to Macon to Columbus line.

NListemaa

&&

.AVIATION...
00Z Update...
Thunderstorms around metro Atlanta have generated multiple
outflow boundaries around KATL and other metro sites. Could see
erratic, gusty winds until 02z or so as showers/storms continue to
drift/fire along the boundaries. Have a TEMPO for TSRA until 02z
for ATL, PDK, and FTY. Winds should shift to the east side
overnight, generally remaining under 4 kts. Will have areas of
MVFR visbys between 06z and 14z, with localized IFR visbys.
Guidance generally favoring NW winds at 4-7 kts on Tuesday.
Expecting scattered to numerous showers and thunderstorms on
Tuesday afternoon/evening, so am maintaining the PROB30 starting
at 18z Tuesday for ATL and other metro sites.

//ATL Confidence...00Z Update...
Medium to high confidence on all elements.

Martin

&&

.PRELIMINARY POINT TEMPS/POPS...
Athens          74  90  73  94 /  40  60  50  20
Atlanta         77  89  75  93 /  40  60  50  30
Blairsville     68  84  67  89 /  50  60  40  20
Cartersville    74  90  73  94 /  40  60  40  20
Columbus        76  92  75  94 /  40  60  60  60
Gainesville     74  88  73  93 /  50  60  50  20
Macon           75  93  73  95 /  30  60  70  50
Rome            75  91  73  96 /  50  60  40  10
Peachtree City  75  91  74  94 /  40  60  50  40
Vidalia         75  91  73  92 /  40  70  70  70

&&

.FFC WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

SHORT TERM...Martin
LONG TERM....NListemaa
AVIATION...Martin

Hazardous Weather Outlook
National Weather Service Peachtree City GA
239 PM EDT Mon Jul 26 2021

GAZ001>009-011>016-019>025-027-030>039-041>062-066>076-078>086-
089>098-102>113-271000-
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-
239 PM EDT Mon Jul 26 2021

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

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

Scattered thunderstorms are possible across north and central
Georgia this afternoon and evening. Storms could become strong
with locally heavy rainfall, gusty winds and frequent lightning.

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

Scattered to numerous thunderstorms are possible across north and
central Georgia Tuesday through Sunday afternoons and evenings. A
few storms could become strong and will be capable of producing
locally heavy rain heavy rain, gusty winds and frequent lightning.

Heat advisory conditions are possible Wednesday through Friday,
especially across east central Georgia.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected through tonight.

Special Weather Statement
National Weather Service Peachtree City GA
656 PM EDT Mon Jul 26 2021

GAZ069>071-081-262330-
Lamar GA-Monroe GA-Upson GA-Crawford GA-
656 PM EDT Mon Jul 26 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN LAMAR...SOUTHWESTERN
MONROE...NORTHEASTERN UPSON AND NORTHWESTERN CRAWFORD COUNTIES UNTIL
730 PM EDT...

At 656 PM EDT...a strong thunderstorm was over Yatesville, or 10
miles south of Barnesville. This storm was nearly stationary.

  HAZARD...Up to 40 mph wind...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
Barnesville, Yatesville, Culloden, Aldora, The Rock, Redbone, Logtown
and Goggins.

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 3285 8424 3304 8425 3313 8415 3306 8403
      3286 8401 3276 8411
TIME...MOT...LOC 2256Z 348DEG 0KT 3290 8413

WIND...40MPH

Special Weather Statement
National Weather Service Peachtree City GA
733 PM EDT Mon Jul 26 2021

GAZ056-058-070-071-270000-
Butts GA-Lamar GA-Monroe GA-Spalding GA-
733 PM EDT Mon Jul 26 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN BUTTS...NORTHEASTERN
LAMAR...NORTHWESTERN MONROE AND SOUTHEASTERN SPALDING COUNTIES UNTIL
800 PM EDT...

At 733 PM EDT...a strong thunderstorm was over Goggins, or near
Barnesville. This storm was nearly stationary.

  HAZARD...Up to 40 mph wind...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
Barnesville, Milner, Aldora, High Falls State Park, Liberty Hill,
Goggins, Collier, Johnstonville and Chappel Mill.

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 3302 8420 3318 8420 3325 8409 3325 8399
      3312 8396 3301 8400
TIME...MOT...LOC 2333Z 261DEG 1KT 3311 8412

WIND...40MPH

Special Weather Statement
National Weather Service Peachtree City GA
818 PM EDT Mon Jul 26 2021

GAZ022-023-034-270045-
Hall GA-Forsyth GA-Gwinnett GA-
818 PM EDT Mon Jul 26 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN HALL...FORSYTH AND
NORTHEASTERN GWINNETT COUNTIES UNTIL 845 PM EDT...

At 817 PM EDT...a strong thunderstorm was over Sugar Hill, or 8 miles
southeast of Cumming...moving southeast at 10 mph.

  HAZARD...Up to 40 mph wind...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
Lawrenceville, Sugar Hill, Suwanee, Buford, Rest Haven, Buford
Dam-Lake Lanier Parks, Lake Lanier Islands and Hog Mountain.

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 3416 8413 3422 8400 3407 8385 3399 8395
      3398 8407
TIME...MOT...LOC 0017Z 328DEG 9KT 3411 8403

WIND...40MPH

Special Weather Statement
National Weather Service Peachtree City GA
819 PM EDT Mon Jul 26 2021

GAZ047-048-270045-
Walton GA-Newton GA-
819 PM EDT Mon Jul 26 2021

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN WALTON AND NORTHEASTERN
NEWTON COUNTIES UNTIL 845 PM EDT...

At 819 PM EDT...a strong thunderstorm was over Youth, or 8 miles west
of Monroe. This storm was nearly stationary.

  HAZARD...Up to 40 mph wind...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
Monroe, Covington, Loganville, Social Circle, Oxford, Walnut Grove,
Between, Jersey, Herndonville, Gum Creek and Youth.

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 3386 8379 3369 8368 3362 8376 3361 8390
      3371 8392 3371 8391 3372 8392 3375 8392
      3375 8393 3380 8394
TIME...MOT...LOC 0019Z 333DEG 4KT 3377 8385

WIND...40MPH

Special Weather Statement
National Weather Service Peachtree City GA
822 PM EDT Mon Jul 26 2021

GAZ069-079-270045-
Upson GA-Talbot GA-
822 PM EDT Mon Jul 26 2021

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN UPSON AND NORTHEASTERN
TALBOT COUNTIES UNTIL 845 PM EDT...

At 821 PM EDT...a strong thunderstorm was over Big Lazer Creek Wma,
or 9 miles southwest of Thomaston. This storm was nearly stationary.

  HAZARD...Up to 40 mph wind...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
Thomaston, Sunset Village, Lincoln Park, Sprewell Bluff State Park,
Crest, Pleasant Hill, Sunnyside, Prattsburg, Hannahs Mill, Big Lazer
Creek Wma and Po Biddy Crossroads.

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 3287 8452 3288 8451 3291 8451 3293 8450
      3296 8435 3286 8428 3269 8435 3266 8449
      3274 8457
TIME...MOT...LOC 0021Z 109DEG 0KT 3278 8442

WIND...40MPH

Special Weather Statement
National Weather Service Peachtree City GA
846 PM EDT Mon Jul 26 2021

GAZ034-047-270115-
Walton GA-Gwinnett GA-
846 PM EDT Mon Jul 26 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN WALTON AND GWINNETT
COUNTIES UNTIL 915 PM EDT...

At 846 PM EDT...a strong thunderstorm was over Lawrenceville...moving
south at 10 mph.

  HAZARD...Up to 40 mph wind...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
Lawrenceville, Snellville, Suwanee, Loganville, Dacula, Grayson,
Mountain Park and Rosebud.

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 3403 8410 3405 8392 3385 8384 3380 8398
      3382 8411
TIME...MOT...LOC 0046Z 344DEG 8KT 3395 8400

WIND...40MPH