Special Weather Statement, NWS Atlanta, GA

Area Forecast Discussion
National Weather Service Peachtree City GA
949 PM EDT Mon Mar 27 2017

.UPDATE...
Based on current radar trends, have adjusted the pops across north
GA. The current area of tsra will continue moving east. The next
band moving into northwest AL is expected to move into north GA by
05Z based on the hi-res models. No other changes planned.

&&

.PREV DISCUSSION... /Issued 343 PM EDT Mon Mar 27 2017/

SHORT TERM /Tonight through Tuesday Night/...
Frontal boundary moving east of the Arklatex. A pre-frontal
trough/convective line has developed just east of the MS river and
is also moving eastward.

Hi-res models keep the line moving across AL and entering the
western portions of the CWFA later this afternoon into the early
evening hours. Models have been pretty consistent with weakening the
line as it moves through. However, there should be enough
instability/mid level energy/steep lapse rates to support some
strong/isolated severe thunderstorms. In addition, the hi-res models
bring in another round of storms overnight, mostly associated with
the cold front. These storms could also be strong with the potential
for isolated severe. The main threats for any severe thunderstorms
would be damaging wind gusts and large hail.

The frontal boundary looks to sag slowly southward during the day
tomorrow. Convection should fire along any old outflow boundaries
from the overnight convection and/or the weak front. With copious
cloud cover, marginal surface instability and weak lapse rates,
storm coverage should be limited to iso/sct and the potential for
strong/severe should be limited.

NListemaa

LONG TERM /Wednesday through Monday/...
Limited changes through the extended period aside from slight
massaging for latest model consensus. Overall, forecast looks on
track. Previous forecast discussion is included below.

31

/Issued 337 AM EDT Mon Mar 27 2017/
At the beginning of the forecast period, the system that traversed
the area on Tuesday will have exited eastward. As upper ridging
builds in on Wednesday a warm and generally drier day can be
expected. A few showers or an isolated thunderstorm can't be ruled
in the vicinity of a remnant weak boundary, but most places will
remain dry.

Rain chances will be increasing again by Thursday afternoon,
especially across eastern sections of the area where showers and a
few thunderstorms will develop near the wedge front along the
periphery of the CAD airmass over the Carolinas.

The opportunity for showers and thunderstorms will increase in
earnest Thursday night into Friday morning across the remainder of
the area as the primary storm system approaches the area from the
west. There is generally better model agreement with regard to the
track of this system as the parent low lifts across the Midwest into
the Ohio Valley. This system evolution would favor the chance for
some strong to severe thunderstorms in our region with 0-6 km bulk
shear values as high as 40-60 knots and 0-1 km values around 30
knots during the Friday morning time frame. Forecast instability is
not overly high, but the several hundred J/kg of CAPE forecast by
the GFS would likely still be sufficient given aforementioned shear
values and favorable upper dynamics. One thing to note is that
models have been indicating the development of weak low pressure
along the Gulf coast which could rob some instability. Nevertheless,
the severe potential with this system late Thursday into Friday
morning will continue to be watched over the coming days.

After this system departs Friday, upper ridging once again takes
hold for the weekend. At this point next weekend's weather appears
benign with warm and dry weather before models diverge on the timing
and details of the next storm system for early next week.

RW

&&

.AVIATION...
00Z Update...
Convection over NE AL should stay north of the ATL area although a
few showers could still occur this evening over ATL/AHN...end in
the ATL area by 06Z but could remain over AHN through the night.
Convection could re-initiate with daytime heating across all
areas Tuesday afternoon. Winds will be calm or light southwest
tonight...becoming west 5 to 10 kts Tuesday. VFR cigs through this
evening. IFR cigs will develop/advect into the forecast area
tonight...becoming VFR by noon Tuesday.

//ATL Confidence...00Z Update...
Medium on convection tonight and Tuesday.
Medium on timing of IFR cigs tonight.
High on remaining elements.

17

&&

.PRELIMINARY POINT TEMPS/POPS...
Athens          58  79  56  84 /  60  30   5   5
Atlanta         60  77  58  82 /  70  30   5  20
Blairsville     55  73  50  77 / 100  30  10   5
Cartersville    59  77  54  81 /  90  30  10  10
Columbus        61  80  61  86 /  40  30   5  20
Gainesville     58  76  55  81 /  90  30   5   5
Macon           58  81  58  84 /  30  30   5  20
Rome            58  78  53  81 / 100  30  10  10
Peachtree City  59  77  56  83 /  60  30  10  20
Vidalia         60  84  62  85 /  20  20   5  20

&&

.FFC WATCHES/WARNINGS/ADVISORIES...
Severe Thunderstorm Watch until 11 PM EDT this evening for the
following zones: Catoosa...Chattooga...Dade...Floyd...Gordon...
Murray...Walker...Whitfield.

&&

SHORT TERM...17
LONG TERM....BDL
AVIATION...17

Hazardous Weather Outlook
National Weather Service Peachtree City GA
415 PM EDT Mon Mar 27 2017

GAZ001>009-011>016-019>025-027-030>039-041>062-066>076-078>086-
089>098-102>113-281000-
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-
415 PM EDT Mon Mar 27 2017

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

.DAY ONE...This afternoon and Tonight...

Scattered thunderstorms are expected primarily over north Georgia
this afternoon into tonight. A few storms could be strong to
severe with gusty winds, frequent lightning, and hail. A brief
tornado is possible over the far northwest.

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

The chance for thunderstorms will increase Thursday evening into
Friday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed through tonight.

Special Weather Statement
National Weather Service Peachtree City GA
946 PM EDT MON MAR 27 2017

GAZ019-030-280215-
Polk GA-Floyd GA-
946 PM EDT MON MAR 27 2017

...SIGNIFICANT WEATHER ADVISORY FOR POLK AND SOUTHEASTERN FLOYD
COUNTIES UNTIL 1015 PM EDT...

At 946 PM EDT...a strong thunderstorm was over Etna, or near
Forney...moving east at 30 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
Cedartown, Rockmart, Aragon, Cave Spring, Seney, Fish Creek, Etna,
Esom Hill, Antioch and Van Wert.

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 3413 8505 3408 8505 3408 8499 3395 8500
      3395 8505 3391 8505 3390 8516 3395 8540
      3409 8542
TIME...MOT...LOC 0146Z 274DEG 27KT 3403 8538

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

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
1011 PM EDT MON MAR 27 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1000 PM     HAIL             2 S CEDARTOWN           33.98N  85.25W
03/27/2017  E0.75 INCH       POLK               GA   AMATEUR RADIO

            DIME SIZE HAIL AND WIND GUSTS TO 30 MPH

&&

EVENT NUMBER FFC1700376

SNELSON

Special Weather Statement
National Weather Service Peachtree City GA
1012 PM EDT MON MAR 27 2017

GAZ019-020-030-031-280300-
Polk GA-Bartow GA-Paulding GA-Floyd GA-
1012 PM EDT MON MAR 27 2017

...SIGNIFICANT WEATHER ADVISORY FOR POLK...SOUTHWESTERN BARTOW...
NORTHERN PAULDING AND SOUTHERN FLOYD COUNTIES UNTIL 1100 PM EDT...

At 1012 PM EDT...a strong thunderstorm was near Fish Creek, or near
Cedartown...moving east 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
Cartersville, Cedartown, Rockmart, Euharlee, Emerson, Aragon, Cave
Spring, Braswell, Taylorsville, Fish Creek, Burnt Hickory Ridge,
Etna, Esom Hill, Antioch, Van Wert, Seney, Cross Roads, Stilesboro
and Lindale.

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 3424 8478 3401 8474 3397 8474 3391 8539
      3414 8543
TIME...MOT...LOC 0212Z 259DEG 29KT 3405 8516

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

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
1022 PM EDT MON MAR 27 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1000 PM     HAIL             1 S CEDARTOWN           34.00N  85.25W
03/27/2017  E0.75 INCH       POLK               GA   AMATEUR RADIO

            DIME SIZE HAIL AND WIND GUSTS TO 30 MPH

&&

CORRECTED LOCATION

EVENT NUMBER FFC1700376

SNELSON

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
1025 PM EDT MON MAR 27 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0705 PM     HAIL             RESACA                  34.58N  84.94W
03/27/2017  E1.25 INCH       GORDON             GA   PUBLIC

&&

EVENT NUMBER FFC1700377

SNELSON

Special Weather Statement
National Weather Service Peachtree City GA
1102 PM EDT MON MAR 27 2017

GAZ001>003-280400-
Catoosa GA-Walker GA-Dade GA-
1102 PM EDT MON MAR 27 2017

...SIGNIFICANT WEATHER ADVISORY FOR CATOOSA...WALKER AND DADE
COUNTIES UNTIL midnight EDT...

At 1101 PM EDT...a line of strong thunderstorms was from southern
Tennessee to northeast Alabama...and moving southeast at 30 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 these storms include
Ringgold, Trenton, Fort Oglethorpe, Rossville, Chickamauga, Lookout
Mountain, Blue Spring, Fairview, Chattanooga  Valley, Cloudland
Canyon State Park, Hooker, Cooper Heights, Rock Spring, Rising Fawn,
Noble, Lakeview, Indian Springs, Graysville, Cole City and Wildwood.

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 3499 8498 3489 8502 3465 8554 3498 8560
TIME...MOT...LOC 0301Z 296DEG 25KT 3527 8538 3478 8642

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