Special Weather Statement, NWS Tallahassee, FL

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TALLAHASSEE FL
248 PM EDT Sun May 19 2013

.NEAR TERM [Remainder of this afternoon and tonight]...
The 16 UTC regional surface analysis showed an outflow boundary
across central GA, associated with a fairly vigorous thunderstorm
complex. It appears that there will be enough of an interaction
between the cold pool associated with this storm complex and the
moderately unstable airmass in its path for scattered thunderstorms
to reach our forecast area later this afternoon and early evening.
The lower to mid tropospheric flow was weak, which would argue
against significant storm organization and/or updraft rotation.
However, sometime cold pools interacting with warm & humid boundary
layers can be more organized than the large scale environment might
suggest. Because the lower and mid tropospheric lapse rates were
relatively steep, marginally severe hail and/or damaging wind gusts
are possible, mainly in our GA zones.

Thunderstorms will gradually diminish after sunset, followed by
generally fair weather later tonight. Once again there may be areas
of low clouds and fog, especially west of the Apalachicola River and
in areas that get rain.

&&

.SHORT TERM [Monday through Tuesday Night]...
The consensus of numerical model guidance portrays an average mid-
upper level shortwave ridge over much of our area in the Monday
and Tuesday time frame, with a west-to-east gradient in PWAT. The
lowest values will be situated over the western part of our area,
with the highest values in the east - closer to the influence of
the Atlantic Ocean. The overall flow pattern through the depth of
the troposphere should be fairly weak, so there shouldn't be a
larger-scale forcing mechanism for widespread convection. PoPs
were concentrated in our Georgia and Florida Big Bend zones where
deeper moisture will reside, with a diurnal trend to be maximized
in the late afternoon. Highs away from the coast will be around 90
degrees in general.

&&

.LONG TERM [Wednesday through Sunday]...
Chances for showers and thunderstorms are expected to be a little
more widespread in our area on Wednesday and Thursday as a low
amplitude mid-upper level trough ejects east from the Plains. On
Wednesday, our area will be situated right underneath highly
divergent flow aloft, and by Thursday a weak surface front should
be developing into our area; both situations favor at least a bit
of a focus for larger scale vertical motion. Therefore, PoPs on
Wednesday and Thursday were increased into the 30-40% range. After
that, a strong surface high builds south into the eastern US, and
the weak surface front shifts south into the Florida Peninsula.
This should allow for some drier air to arrive and slightly lower
PoPs closer to climatological normals. The temperature forecast is
one of persistence, with highs maintaining close to 90.

&&

.AVIATION [through 18 UTC Monday]...
Clusters of thunderstorms have developed in north and central GA,
and appeared to be headed toward KABY (mid-late afternoon) and KVLD
(late afternoon-early evening). Wind gusts of 35 KT and IFR Vis are
possible with these storms as they translate quickly southeastward.
It's unlikely that these storms will affect the other terminals. Fog
and low CIGS are possible early Monday morning, especially at KECP
and KDHN.

&&

.MARINE...
Winds and seas should remain relatively calm through the work
week. Winds will be generally 10 knots or less, and seas 2 feet or
less. There will be a chance for a few showers or storms, and
winds could be briefly higher near storms. Storms would be most
likely near the coast and in the late afternoon or evening hours.

&&

.FIRE WEATHER...
Relative humidity values will remain above critical levels through
Tuesday with relatively light transport winds and deep mixing
heights especially over Florida. The airmass should remain
sufficiently moist to preclude red flag conditions into the upcoming
weekend.

&&

.HYDROLOGY...
Any rain through Friday would likely arrive in the form of
scattered showers and thunderstorms, and average rainfall totals
should be low enough to prevent any widespread flooding concerns
or issues on mainstem rivers across the area.

&&

.PRELIMINARY POINT TEMPS/POPS...
Tallahassee   66  90  66  90  69 / 20  20  10  20  20
Panama City   70  85  69  85  71 / 10  10  10  10  10
Dothan        68  91  67  91  71 / 10  10  10  10  10
Albany        68  90  67  91  69 / 30  20  20  20  20
Valdosta      67  89  65  90  68 / 30  40  20  30  20
Cross City    66  88  64  89  67 / 20  30  20  30  20
Apalachicola  69  83  68  82  71 /  0  10  10  20  10

&&

.TAE WATCHES/WARNINGS/ADVISORIES...
FL...None.
GA...None.
AL...None.
GM...None.

&&

NEAR TERM...Fournier
SHORT TERM...Lamers
LONG TERM...Lamers
AVIATION...Fournier
MARINE...Lamers
FIRE WEATHER...Block
HYDROLOGY...Lamers

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SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
403 PM EDT SUN MAY 19 2013

GAZ126>131-192100-
TURNER GA-TIFT GA-LEE GA-BEN HILL GA-WORTH GA-IRWIN GA-
403 PM EDT SUN MAY 19 2013

...SIGNIFICANT WEATHER ADVISORY IN EFFECT FOR BEN HILL...IRWIN...
LEE...TIFT...TURNER AND WORTH COUNTIES...

* UNTIL 500 PM EDT

AT 400 PM EDT...THE NATIONAL WEATHER SERVICE HAS DETECTED A CLUSTER OF
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 7 MILES NORTHEAST OF
POPE CITY TO HATLEY TO CHOKEE...MOVING SOUTHEAST AT 35 MPH.

THESE STORMS WILL BE NEAR...
  ASHBURN BY 425 PM EDT.
  MYSTIC BY 440 PM EDT.
  FITZGERALD BY 445 PM EDT.
  OCILLA BY 450 PM EDT.
  TY TY BY 455 PM EDT.
  TIFTON BY 500 PM EDT.

WINDS 40 TO 50 MPH ARE EXPECTED WITH THESE STORMS. DIME TO PENNY SIZE
HAIL IS POSSIBLE.

REPORT SIGNIFICANT WEATHER TO THE NATIONAL WEATHER SERVICE AT (8 5 0)
9 4 2 8 8 3 3. OR...CONTACT LAW ENFORCEMENT.

LAT...LON 3186 8393 3181 8381 3181 8362 3186 8361
      3185 8318 3182 8313 3178 8299 3150 8320
      3143 8365 3190 8414 3192 8392
TIME...MOT...LOC 2001Z 320DEG 31KT 3213 8341 3190 8360
          3182 8406

22-BARRY