Special Weather Statement, NWS Atlanta, GA

Area Forecast Discussion
National Weather Service Peachtree City GA
408 PM EDT Thu Jul 13 2017

.SHORT TERM /Tonight through Friday Night/...

A ridge of high pressure will dominate the sensible weather through
the period. The northern stream anchored along the Canadian
provinces will shift south as a trough digs across the Great Lakes.
Meanwhile, at the surface, the Bermuda high will continue to extend
across portions of north/central GA. With better surface and mid
level convergence, should see better coverage of convection across
north GA both this afternoon and tomorrow afternoon.  However, am
noticing the surface high breaks down a bit ahead of the approaching
front later Friday. Therefore, we anticipate the axis of better
dynamics and moisture may begin to sag further south, with coverage
extending into the metro and Athens area. The severe threat looks
fairly minimal, although we can not rule out isolated strong to
severe thunderstorms. The main threats associated with these storms
will be gusty winds, small hail, frequent lightning and heavy
precipitation leading to localized flooding.

Temperatures will be around or just above average for this time of
year.  Highs in the low to mid 90s, with cooler temperatures across
the higher terrain.  Lows in low/mid 70s with 60s along the higher
elevations/valleys.

26

&&

.LONG TERM /Saturday through Thursday/...

Guidance generally on track with similar evolution trends for
weekend front and some weak ridging into next week. No significant
adjustment from previous pops/weather thinking seen warranted and
kept higher chance pops over weekend and some slight to chance
pops beyond. Other forecast elements refreshed with model blend.
Previous discussion follows...

Baker

PREV DISCUSSION... /issued 405 AM EDT Thu Jul 13 2017/

LONG TERM /Friday Night through Wednesday/...
Model solutions continue to delay the onset of weekend cold front
into the state. Timing varies from early Saturday to overnight
Saturday night/Sunday morning. The general consensus is more for a
Saturday afternoon/evening timing, and have ended up with good
chance pops rather than the previous likely pops due to the
uncertainty. GFS progresses the front into central and south
Georgia more quickly, with band of enhanced moisture along the
front south of the CWA by early Monday morning. ECMWF stalls the
boundary over middle Georgia, and not clearing it out of the CWA
until a secondary, dry trough axis pushes through the state on
Tuesday. Solutions still diverge with the high pressure ridge
building in mid-week and to what extent it will dominate the
region. For now, it appears we remain under the influence of
localized low pressure features/disturbances, with generally
diurnal convection persisting through next week.

Will still need to monitor the potential for Heat Advisory,
particularly late this week as heat index values near the 105
degree criteria over portions of central Georgia.

31

&&

.AVIATION...
18Z Update...

VFR conditions expected through the TAF period. However, there
will be isolated to scattered showers/thunderstorms possible
across the metro TAF sites through the afternoon. CU field around
5kft. Any precipitation activity should diminish around sunset
with convective debris clouds through the evening hours. Clear and
calm conditions expected overnight. Winds will increase with CU
development around 4kft by mid/late morning Friday. West winds
through the TAF period; although some models indicating light SSE
winds at ATL this evening. This should be brief.

//ATL Confidence...18Z Update...
Low/Medium on SSE winds at ATL.
Medium on convective coverage at metro ATL.
High on all elements.

26

&&

.PRELIMINARY POINT TEMPS/POPS...
Athens          72  94  73  92 /  20  20  20  50
Atlanta         73  92  74  90 /  20  30  20  50
Blairsville     66  87  68  83 /  20  30  30  50
Cartersville    71  92  72  89 /  20  40  30  50
Columbus        74  95  76  94 /  10  30  20  40
Gainesville     72  91  73  88 /  20  30  30  50
Macon           72  95  74  94 /  10  20  20  50
Rome            71  93  73  89 /  20  50  30  50
Peachtree City  70  93  72  91 /  20  30  20  50
Vidalia         73  95  75  95 /  10  20  10  40

&&

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

SHORT TERM...26
LONG TERM....31/Baker
AVIATION...26

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Special Weather Statement
National Weather Service Peachtree City GA
558 PM EDT THU JUL 13 2017

GAZ013-014-021>023-032>034-043>045-132230-
Hall GA-Dawson GA-North Fulton GA-Douglas GA-Cobb GA-Cherokee GA-
DeKalb GA-Forsyth GA-Gwinnett GA-Pickens GA-South Fulton GA-
558 PM EDT THU JUL 13 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN HALL...DAWSON...
NORTH FULTON...NORTHEASTERN DOUGLAS...COBB...EASTERN CHEROKEE...
DEKALB...FORSYTH...WESTERN GWINNETT...SOUTHEASTERN PICKENS AND SOUTH
FULTON COUNTIES UNTIL 630 PM EDT...

At 557 PM EDT...a line of strong thunderstorms was along a line
extending from Silver City to near Campbellton...and moving north at
10 mph.

  HAZARD...Winds up to 40 mph...pea sized hail 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
Atlanta, Marietta, Gainesville, Douglasville, Lawrenceville, Decatur,
Cumming, Dawsonville, Sandy Springs, Roswell, Johns Creek,
Alpharetta, Smyrna, Dunwoody, East Point, Milton, Duluth, Woodstock,
Union City and Sugar 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 3431 8377 3365 8426 3365 8446 3356 8446
      3369 8481 3379 8474 3379 8472 3381 8472
      3453 8422
TIME...MOT...LOC 2157Z 162DEG 9KT 3432 8409 3362 8463

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

Special Weather Statement
National Weather Service Peachtree City GA
609 PM EDT THU JUL 13 2017

GAZ110-132245-
Telfair GA-
609 PM EDT THU JUL 13 2017

...SIGNIFICANT WEATHER ADVISORY FOR TELFAIR COUNTY UNTIL 645 PM
EDT...

At 608 PM EDT...a strong thunderstorm was near Horse Creek WMA, or
10 miles north of Broxton...moving northwest at 10 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
Lumber City, Jacksonville, Temperance, China Hill, Horse Creek Wma
and Workmore.

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 3180 8308 3181 8309 3181 8313 3184 8317
      3187 8318 3188 8319 3202 8303 3192 8265
      3192 8268 3190 8269 3186 8276 3186 8278
      3185 8279 3184 8279 3178 8289 3179 8290
      3178 8292 3179 8298 3178 8301
TIME...MOT...LOC 2208Z 115DEG 10KT 3178 8292

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

Special Weather Statement
National Weather Service Peachtree City GA
739 PM EDT THU JUL 13 2017

GAZ078-079-089-090-140015-
Chattahoochee GA-Harris GA-Talbot GA-Muscogee GA-
739 PM EDT THU JUL 13 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN CHATTAHOOCHEE...SOUTHERN
HARRIS...SOUTHWESTERN TALBOT AND MUSCOGEE COUNTIES UNTIL 815 PM
EDT...

At 739 PM EDT...a line of strong thunderstorms was along a line
extending from near Griffen Mill to near Upatoi...and moving
southwest at 10 mph.

  HAZARD...Winds up to 40 mph...pea sized hail 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
Columbus, Hamilton, Waverly Hall, North Fort Benning, Bibb City,
Upatoi, Ellerslie, Laurel Hills, Green Island Hills, Juniper, Vista
Terrace, Cataula, Columbus Metropolitan Airport, Baughville, Rose
Hill, Mountain Hill, Eelbeck/West Fort Benning, Benning Hills,
Avondale and Benning 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 3273 8512 3277 8456 3252 8458 3253 8461
      3253 8463 3249 8464 3249 8466 3235 8466
      3237 8498 3238 8497 3239 8499 3239 8497
      3244 8497 3245 8500 3252 8500 3258 8507
      3263 8508 3264 8511 3266 8509 3269 8512
TIME...MOT...LOC 2339Z 051DEG 11KT 3255 8523 3251 8475

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

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