Special Weather Statement, NWS Atlanta, GA

Area Forecast Discussion
National Weather Service Peachtree City GA
450 AM EDT Fri Mar 26 2021

.SHORT TERM /Today through Saturday/...

The cold front continues to sink southeastward through the forecast
area as the short term begins. At the time of this writing, the
frontal boundary is positioned roughly along the I-20 corridor, with
showers and thunderstorms ongoing to the immediate south of the
front. The large scale ascent ahead of the front is steadily
weakening as the parent low pressure system quickly retreats
northeastward into southeastern Canada. This line is finally moving
into a somewhat less favorable environment for severe weather, with
more stable air in place compared to several hours ago. Still, with
0-1 km shear values of 25-35 kts and 0-1 km storm relative helicity
values of 200-300 m2/s2, the threat for severe thunderstorms cannot
be ruled out in the early morning hours today. Severe thunderstorms
that occur could produce damaging wind gusts and brief tornadoes are
still possible. Because of this, a Tornado Watch remains in effect
in our forecast area at this time stretching from Harris county to
Madison county. The need to continue or expire this watch will be
evaluated in the next couple of hours.

Precipitation has mostly come to an end behind the cold front, with
northwesterly low level flow and drier air setting up in that area.
As a result, little to no precipitation is expected across that area
during the daytime today. Low temperatures this morning are in the
low 50s behind the cold front and will be in the mid to upper 60s
ahead of the front. The Flash Flood Watch has been cancelled across
far north Georgia. Some localized flash flooding and multiple
instances of river flood warnings are ongoing across the far
northern tier. Please continue to monitor these conditions and heed
flash flood warnings and road closures.

Likely PoPs will steadily spread southeastward into central Georgia
during the daytime hours today. After sunrise, warming surface
temperatures ahead of the front will create a corridor of
instability across central Georgia, with MLCAPE values increasing to
1000-1500 J/kg. Low-level convergence ahead of the front will aid in
thunderstorm development during the morning and afternoon hours.
While dynamics along the front will continue to weaken as it sinks
into central Georgia today, 0-1 km shear of 25-30 kts, deep layer
bulk shear of 50-60 kts, and 0-1 km storm relative helicity values
of 100-150 m2/s2 combined with moderate instability still warrants
mention of a marginal risk of severe weather. Damaging wind gusts
will be the primary threat with any severe thunderstorms that occur,
a brief tornado cannot be ruled out. This evening, the front will
finally weaken and stall across south-central Georgia, with only
some scattered showers and thunderstorms lingering along the
boundary.

On Friday night through Saturday morning, the lingering frontal
boundary will lift back to the north across the forecast area as a
warm front, reinforcing a warm and humid airmass across the forecast
area during the day on Saturday. Highs will reach into the 80s
across the majority of the forecast area, with the exception of the
far northern tier. The warm front will eventually setting up across
far north Georgia after sunrise on Saturday, setting up high-end
chance to likely PoPs across the northern third of the forecast
area. Some embedded thunderstorm activity will also be possible in
association with this precipitation, which could lead to instances
of locally heavy rainfall. With very wet soils remaining across that
area, that heavy rain could cause isolated flash flooding and quick
responses to creeks, streams, and rivers.

King

.LONG TERM /Saturday Night through Thursday/...

A fast-moving trough and associated cold front is expected to cross
the area Sunday with another round of showers and thunderstorms.
Instability not overly impressive but forcing/ascent from the sfc to
mid lvls definitely supports a risk of a few storms becoming strong
to severe, especially across north GA where better low lvl shear
should interact with synoptic-scale forcing. SPC day 3 "Slight Risk"
across the north appears reasonable at this time.

Cold front should clear the area by 12z/Monday with cooler and drier
air expected for Monday into early Tuesday. By Monday night/Tuesday,
wet weather could return as southern wave traversing the Gulf coast
lifts across the SE region. 00z/26 ECMWF is the most aggressive with
this wave and resultant precip. Airmass recovery not great with this
system so severe threat appears rather low to non-existent at this
time. A deeper trough is expected to cross the area towards the
middle (Wed/Thurs) of the week which could bring another round of
strong to severe storms to the area, followed by much cooler weather.

DJN.83

&&

.AVIATION...
06Z Update...
A line of SHRA/TSRA is extending through the ATL metro area and
towards AHN as a cold front pushes through north Georgia. A TEMPO
for TSRA with VRB15G30KT is being carried for 06-07Z in the ATL
metro sites, 06-10Z at AHN, 08-12Z at CSG, and 10-14Z at MCN as
this line moves south and east through Georgia. Ceilings have
mostly lowered to MVFR, which will persist through the remainder
of the overnight hours before lifting back to VFR around 15-16Z.
Cloud cover will scatter out by late afternoon tomorrow, but this
will be short-lived, with MVFR ceilings building back in early
Saturday morning. SW winds of 10-15 kts with gusts up to 25 kts
will shift to NW behind the front, weakening to 5-9 kts after
sunrise.

//ATL Confidence...06Z Update...
Medium confidence on all elements.

King

&&

.PRELIMINARY POINT TEMPS/POPS...
Athens          78  58  80  64 /  60  20  40  30
Atlanta         76  61  80  64 /  60  20  30  30
Blairsville     75  50  70  59 /  40  30  70  70
Cartersville    76  55  79  61 /  40  30  50  50
Columbus        78  64  84  64 /  60  30  10  10
Gainesville     76  56  75  63 /  50  20  50  50
Macon           79  63  86  63 /  70  30  10   5
Rome            78  54  78  62 /  20  40  60  60
Peachtree City  76  60  82  63 /  60  20  30  20
Vidalia         86  66  89  66 /  30  20  10   5

&&

.FFC WATCHES/WARNINGS/ADVISORIES...
Tornado Watch until 7 AM EDT this morning for the following
zones: Butts...Clarke...Clayton...Coweta...Fayette...Greene...
Harris...Heard...Henry...Jasper...Lamar...Madison...Meriwether...
Morgan...Newton...Oconee...Oglethorpe...Pike...Putnam...
Rockdale...Spalding...Taliaferro...Troup...Walton...Wilkes.

&&

SHORT TERM...King
LONG TERM....DJN.83/King
AVIATION...King

Hazardous Weather Outlook
National Weather Service Peachtree City GA
531 AM EDT Fri Mar 26 2021

GAZ001>009-011>016-019>025-027-030>039-041>062-066>076-078>086-
089>098-102>113-270945-
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-
531 AM EDT Fri Mar 26 2021

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

.DAY ONE...Today and Tonight...

Scattered thunderstorms will continue across portions of central
and eastern Georgia today as the surface front continues to push
southward through the forecast area. Isolated storms could become
severe. Damaging wind gusts will be the primary threat with any
severe storms that occur.

Previous heavy rainfall across north Georgia and continued runoff
will allow river flooding to continue throughout much of today
across far north Georgia.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday...

Thunderstorms and heavy rain are likely over portions of north
and central Georgia on Saturday and Sunday, with a few strong to
severe storms possible each day. Localized flash flooding is also
possible across far north Georgia where the heaviest rain occurs.

There is also a chance of thunderstorms across portions of north
and central Georgia on Wednesday and Wednesday night.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not requested but spotters are encouraged
to submit reports of severe weather or damage reports from
yesterday's severe weather event 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
201 AM EDT Fri Mar 26 2021

GAZ022-023-025-034-035-260630-
Hall GA-Jackson GA-Barrow GA-Forsyth GA-Gwinnett GA-
201 AM EDT Fri Mar 26 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN HALL...NORTHWESTERN
JACKSON...NORTHWESTERN BARROW...SOUTHERN FORSYTH AND NORTHEASTERN
GWINNETT COUNTIES UNTIL 230 AM EDT...

At 201 AM EDT...a strong thunderstorm was over Sugar Hill, or 8 miles
north of Lawrenceville...moving east at 50 mph.

  HAZARD...Up to 40 mph wind...pea 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
Jefferson, Sugar Hill, Suwanee, Buford, Braselton, Auburn, Flowery
Branch, Oakwood, Hoschton, Pendergrass, Talmo, Rest Haven, Candler,
County Line, Thompsons Mill, Chateau Elan, Buford Dam-Lake Lanier
Parks, Chestnut Mountain, Road Atlanta-Lanier Speedway 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.

LAT...LON 3418 8357 3406 8359 3400 8409 3415 8413
      3427 8364
TIME...MOT...LOC 0601Z 256DEG 45KT 3407 8403

HAIL...0.25IN
WIND...40MPH

Special Weather Statement
National Weather Service Peachtree City GA
223 AM EDT Fri Mar 26 2021

GAZ032-033-043>045-260700-
North Fulton GA-Douglas GA-Cobb GA-DeKalb GA-South Fulton GA-
223 AM EDT Fri Mar 26 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTH FULTON...NORTHEASTERN
DOUGLAS...SOUTHEASTERN COBB...DEKALB AND NORTHEASTERN SOUTH FULTON
COUNTIES UNTIL 300 AM EDT...

At 223 AM EDT...a strong thunderstorm was over Sandtown, or 8 miles
east of Douglasville...moving east at 50 mph.

  HAZARD...Up to 40 mph wind...pea 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
Atlanta, Douglasville, Decatur, Smyrna, East Point, College Park,
Chamblee, Doraville, Clarkston, Austell, Hapeville, Stone Mountain,
Avondale Estates, Pine Lake, Lithia Springs, North Decatur, North
Atlanta, Midtown, Candler-Mcafee and Druid Hills.

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 3378 8472 3391 8424 3380 8414 3367 8416
      3365 8438 3365 8444 3364 8445 3365 8446
      3364 8446 3361 8468
TIME...MOT...LOC 0623Z 256DEG 45KT 3372 8460

HAIL...0.25IN
WIND...40MPH

Special Weather Statement
National Weather Service Peachtree City GA
226 AM EDT Fri Mar 26 2021

GAZ023>025-027-260700-
Madison GA-Hall GA-Banks GA-Jackson GA-
226 AM EDT Fri Mar 26 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN MADISON...SOUTHEASTERN
HALL...SOUTHERN BANKS AND JACKSON COUNTIES UNTIL 300 AM EDT...

At 226 AM EDT...a strong thunderstorm was over Pendergrass, or near
Jefferson...moving east at 55 mph.

  HAZARD...40 to 50 mph wind...pea 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
Jefferson, Commerce, Danielsville, Maysville, Arcade, Nicholson,
Pendergrass, Ila, Talmo, Pocataligo, Peach State Speedway, Apple
Valley and Banks Crossing.

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 3426 8334 3424 8334 3426 8330 3425 8327
      3425 8320 3424 8317 3427 8311 3426 8312
      3423 8308 3422 8308 3421 8309 3417 8310
      3415 8306 3413 8306 3407 8372 3424 8377
      3433 8339
TIME...MOT...LOC 0626Z 258DEG 46KT 3417 8366

HAIL...0.25IN
WIND...50MPH

Special Weather Statement
National Weather Service Peachtree City GA
258 AM EDT Fri Mar 26 2021

GAZ034-035-037-045>047-260730-
Walton GA-Rockdale GA-Barrow GA-DeKalb GA-Gwinnett GA-Oconee GA-
258 AM EDT Fri Mar 26 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN WALTON...
NORTHEASTERN ROCKDALE...SOUTHWESTERN BARROW...EASTERN DEKALB...
SOUTHEASTERN GWINNETT AND NORTHWESTERN OCONEE COUNTIES UNTIL 330 AM
EDT...

At 258 AM EDT...a strong thunderstorm was over Snellville, or 9 miles
south of Lawrenceville...moving east at 60 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
Lawrenceville, Winder, Monroe, Snellville, Lilburn, Loganville,
Grayson, Bethlehem, Between, Mountain Park, Fort Yargo State Park,
Bold Springs, Windsor, Harbin, Nicholasville, Youth, Big Haynes Creek
Park, Rosebud, Campton and Gratis.

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 3391 8357 3377 8372 3374 8412 3389 8415
      3398 8376
TIME...MOT...LOC 0658Z 257DEG 54KT 3383 8403

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

Special Weather Statement
National Weather Service Peachtree City GA
406 AM EDT Fri Mar 26 2021

GAZ027-038-260815-
Madison GA-Oglethorpe GA-
406 AM EDT Fri Mar 26 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN MADISON AND NORTHERN
OGLETHORPE COUNTIES UNTIL 415 AM EDT...

At 406 AM EDT...a strong thunderstorm was over Comer, or 7 miles
southeast of Danielsville...moving east at 55 mph.

  HAZARD...Up to 40 mph wind...pea 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
Danielsville, Comer, Carlton, Smithonia, Watson Mill Bridge State
Park, Point Peter and Paoli.

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 3396 8318 3414 8322 3417 8310 3415 8306
      3411 8305 3411 8303 3410 8304 3408 8300
      3404 8299 3403 8295 3403 8293 3402 8294
      3401 8294 3401 8291 3400 8291 3399 8287
TIME...MOT...LOC 0806Z 257DEG 49KT 3407 8311

HAIL...0.25IN
WIND...40MPH

Special Weather Statement
National Weather Service Peachtree City GA
558 AM EDT Fri Mar 26 2021

GAZ053-054-056-067-068-261030-
Fayette GA-Coweta GA-Spalding GA-Meriwether GA-Pike GA-
558 AM EDT Fri Mar 26 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN FAYETTE...
SOUTHEASTERN COWETA...SPALDING...NORTHEASTERN MERIWETHER AND NORTHERN
PIKE COUNTIES UNTIL 630 AM EDT...

At 558 AM EDT...a strong thunderstorm was over Haralson, or 14 miles
northeast of Greenville...moving east at 60 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
Griffin, Senoia, Brooks, Williamson, Orchard Hill, Haralson, Woolsey,
Sunny Side, East Griffin, Highland Mills, Rocky Mount, Towalaga,
Experiment, Walker Mill, Birdie, Vaughn, Hollonville, Alvaton, Rover
and Digbey.

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 3336 8439 3335 8439 3335 8425 3334 8425
      3334 8417 3333 8415 3332 8415 3331 8414
      3319 8413 3318 8422 3319 8423 3319 8424
      3318 8425 3312 8472 3326 8473
TIME...MOT...LOC 0958Z 252DEG 51KT 3321 8458

WIND...40MPH