Area Forecast Discussion
Issued by NWS
FXUS62 KTAE 310729
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TALLAHASSEE FL
329 AM EDT MON AUG 31 2015
.Near Term [Through Today]...
The surface trough that is the remnants of Erika will remain east
of most of our region today. The exception will be across the
southeast Big Bend where PWATs are between 1.75-2" this morning
and expected to gradually increase a bit as the trough lifts north
through the day. Elsewhere, much drier air will be present with
partly cloudy skies and highs in the low 90s. There may be a few
showers later today across southeast Alabama where a weak wave and
surface trough will pass, though with the lack of moisture any
convection should remain shallow, light, and short-lived.
.Short Term [Tonight Through Wednesday]...
A variety of 00Z model runs show a MCV, resulting from convection
over the eastern Gulf of Mexico, drifting slowly north into the
Florida Big Bend region by Tuesday. There wasn`t much evidence of
a circulation aloft yet in the TBW or KEY soundings from yesterday
evening, or in the GOES derived wind fields. However, this MCV is
expected to emanate from convective activity in the next 12-18
hours. There is some difference on the precise trajectory, with
some models showing the circulation situated just east of our
forecast area on Tuesday, with others showing it close to
Tallahassee. This would obviously have big implications on the
forecast, as the MCV will likely be situated near a precipitable
water gradient. Most of the rain will likely occur along and east
of the track of that low. Given these uncertainties, PoPs were not
bumped too high yet in the eastern Big Bend counties, but the
highest rain chances were placed along a line from Apalachicola,
to Tallahassee, to Valdosta and areas southeast of that. That
configuration of PoPs was maintained from Tuesday into Wednesday.
More confidence in the distribution of PoPs should be gained today
as the convection over the eastern Gulf of Mexico evolves. It`s
quite possible that PoPs and sky cover will need to be further
increased in the southeast part of our forecast area, with a
reduction in the diurnal temperature range as well. Elsewhere in
the area, some isolated showers and storms will be possible with
generally mostly to partly sunny skies.
.Long Term [Wednesday Night Through Monday]...
Although there are definitely some differences in the details of
how the various global models unfold the upper level flow pattern
in the extended, but they generally show an area of lower heights
in the vicinity of our region. This should maintain some chances
of showers and thunderstorms through the remainder of the
forecast, with temperatures generally near normal.
[Through 06Z Tuesday] LIFR/IFR CIGS are likely this morning at
ABY and VLD, and possible at KTLH. Elsewhere a brief period of
MVFR visibilities will be possible near sunrise. Otherwise, VFR
conditions are expected to prevail through the afternoon, with
showers and storms remaining east of all of our terminals.
Winds and seas should remain fairly subdued through the forecast
period, other than in or near thunderstorm activity.
Hazardous fire weather conditions are not expected over the next
Locally heavy rainfall will be possible in the Florida Big Bend or
south-central Georgia over the next few days, particularly on
Tuesday and Wednesday. Widespread flooding or flooding on the
primary rivers is not expected, but some flooding of low-lying or
urbanized areas will be possible.
.Preliminary Point Temps/PoPs...
Tallahassee 91 74 91 75 92 / 10 10 40 20 40
Panama City 89 76 88 76 88 / 10 10 30 20 30
Dothan 90 72 93 73 92 / 20 0 20 10 20
Albany 89 73 91 74 91 / 20 0 20 10 30
Valdosta 90 72 90 73 90 / 20 10 40 20 50
Cross City 89 75 89 75 90 / 50 30 50 20 40
Apalachicola 88 76 89 77 89 / 20 20 40 30 40