Area Forecast Discussion
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701
FXUS62 KTAE 271814
AFDTAE

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TALLAHASSEE FL
214 PM EDT Sun Jul 27 2014

.Near Term [Through Tonight]...
Expect a quiet evening and overnight across the region. Skies will
gradually clear after sunset as the heating of the day is lost. The
last couple of nights has featured areas of fog or stratus
developing two or three hours before sunrise. Expect that this will
occur again on Monday morning, primarily across the southeastern
portion of the region. Should be another muggy night with lows in
the mid to upper 70s.

.Short Term [Monday Through Tuesday Night]...
This period will be characterized by strongly amplifying meridional
flow with a deepening upper trough over the eastern half of the
country and strong ridge across the west. This will push an
unusually strong summer cold front across the forecast area late
Monday through Tuesday. The front will be poised just to our north
across south central AL and GA Monday evening, and will move to a
position from around Albany to Destin after midnight. Tuesday
morning the front will extend from Valdosta to Apalachicola and
will exit the Big Bend area by midday Tuesday. The upper flow is so
amplified the front is likely to make it as far south as Key West by
late in the week.

Ahead of the front, a very hot and humid airmass will be in place,
with temperatures rising into the upper 90s Monday afternoon. With
dewpoints in the mid 70s, we will still see heat indices exceed 105
degrees over a large portion of the area, with values as high as 108
degrees possible in our Florida counties, so another heat advisory
may be needed for Monday afternoon.

As the front approaches southern AL and southern GA tomorrow
afternoon and evening, there will be broken line of strong to severe
thunderstorms moving across the area. Cape values will approach 4000
J/Kg Monday afternoon and evening ahead of the front with nearly
unidirectional deep west-northwest flow aloft and drying at mid
levels. This scenario will result in some damaging straight-line
winds as the main threat. There could be some hail reports due to
very strong updraft values, but with the airmass being so warm it
may be difficult to get large hail at the surface. Expect the threat
of severe storms from early afternoon until around 9pm-10pm.

A much drier airmass will push in behind the front on Tuesday and
Tuesday night, with dewpoints dropping well into the 60s.
Temperatures will be cooler as well, as 500mb heights drop a good 60
meters through this period. Highs will range from the upper 80s
along the northern border, to lower to mid 90s along the coast and
across the Big Bend.

.Long Term [Wednesday Through Sunday]...
The full latitude eastern CONUS trough will continue to amplify
through the period. The front which will move across the area early
in the week will usher in much drier and cooler air through
Thursday, with the possibility of reaching some record morning lows.
The long standing records for this period at Tallahassee are:

July 30 - 67 (1927)
July 31 - 63 (1896)
Aug 1 - 64 (1993)

Expect generally dry and relatively cool conditions for Wednesday
and Thursday with very low PoPs. Thursday and Friday morning lows,
July 31st and Aug 1st, will range from 65-70.

By late Thursday, moisture will begin to increase once again across
the forecast area as another upper disturbance within the main upper
trough moves into the forecast area. For Friday through the weekend
expect a return to scattered showers and thunderstorms each
afternoon and evening. The increased convection for the end of the
week and weekend will keep high temperatures in the 85 to 90 range
across the area.

&&

.Aviation...
[Through 18Z Monday] VFR conditions will prevail through the
evening and early overnight hours. Between 08z and 10z expect an
area of MVFR-IFR cigs to develop between ECP-TLH-VLD. These
restrictions should last through about 14z before VFR conditions
will return. TSRA are expected after 18z Monday, particularly at
DHN/ABY.


&&

.Marine...
The pressure gradient between the subtropical ridge to the south and
the approaching cold front to the north will tighten tonight through
Tuesday with westerly winds reaching exercise caution levels at
times. Winds will gradually diminish and become offshore Tuesday
night into Wednesday.

&&

.Fire Weather...
Red flag conditions are not expected for the next couple of days.
Drier conditions will move in on Tuesday and continue through
Thursday. Relative humidity values may approach critical levels on
Wednesday in North Florida.

&&

.Hydrology...
The Shoal River at Mossy Head has reached bank full stage but
continues to fall. All other area rivers are below bank full stage.
Thunderstorms could bring locally heavy rainfall on Monday but
widespread impacts are not expected.

&&

.Preliminary Point Temps/PoPs...

Tallahassee   78  96  73  95  67 /  10  50  50  20  10
Panama City   80  91  77  91  73 /  10  40  40  20  10
Dothan        76  96  70  91  67 /  10  50  50  10   0
Albany        77  96  70  91  66 /  10  50  50  10   0
Valdosta      77  96  71  93  65 /  10  50  50  20  10
Cross City    78  94  76  93  69 /  10  30  30  40  10
Apalachicola  80  91  77  92  73 /  10  30  30  20  10

&&

.TAE Watches/Warnings/Advisories...

FL...Heat Advisory until 7 PM EDT /6 PM CDT/ this evening for Calhoun-
     Central Walton-Coastal Bay-Coastal Franklin-Coastal Gulf-
     Coastal Jefferson-Coastal Taylor-Coastal Wakulla-Gadsden-
     Holmes-Inland Bay-Inland Franklin-Inland Gulf-Inland
     Jefferson-Inland Taylor-Inland Wakulla-Inland Walton-
     Jackson-Lafayette-Leon-Liberty-Madison-South Walton-
     Washington.

     High Rip Current Risk until 11 PM CDT this evening for Coastal
     Bay.

GA...Heat Advisory until 7 PM EDT this evening for Baker-Ben Hill-
     Berrien-Brooks-Calhoun-Clay-Colquitt-Cook-Decatur-Dougherty-
     Early-Grady-Irwin-Lanier-Lee-Lowndes-Miller-Mitchell-
     Quitman-Randolph-Seminole-Terrell-Thomas-Tift-Turner-Worth.

AL...Heat Advisory until 6 PM CDT this evening for Coffee-Dale-Geneva-
     Henry-Houston.

GM...None.

&&

$$

NEAR TERM...GODSEY
SHORT TERM...HOLLINGSWORTH
LONG TERM...HOLLINGSWORTH
AVIATION...GODSEY
MARINE...HOLLINGSWORTH
FIRE WEATHER...GODSEY
HYDROLOGY...MCDERMOTT




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