Area Forecast Discussion
Issued by NWS
FXUS62 KTAE 130125
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TALLAHASSEE FL
925 PM EDT Sat Apr 12 2014
.Near Term [Through Tonight]...
The region remains dominated by high pressure to the east over the
Atlantic. Southerly flow will keep temperatures mild tonight with
lows in the mid 50s. Mostly clear skies will likely bring patchy fog
overnight, mostly in the western half of the region.
[Through 00Z Monday]...
The synoptic pattern hasn`t changed much in the past 24 hours so
persistence will be used in this forecast package. Near- surface
moisture will increase some this evening as the sea breeze front
moves farther inland. However, this moisture will be shallow,
which should limit the potential for dense fog/low cigs- though a
period of MVFR vis is possible within a few hours either side of
sunrise Sunday. VFR to unrestricted cigs and unrestricted vis are
expected for the remainder of Sunday, along with SE winds around
.Prev Discussion [353 PM EDT]...
.Short Term [Sunday Through Monday Night]...
Another fair and quite warm day is on tap to finish the weekend with
highs ranging from the upper 70s near the coast to the high end of
the middle 80s well inland on Sunday, as the weak ridge of high
pressure remains in control over the area. As this ridge begins to
slide eastward, more humid air will begin to advect in off the Gulf
of Mexico on Sunday night and Monday, which will also be accompanied
by increasing cloudiness ahead of the next developing upper level
low pressure system to our west. Lows on Sunday night should range
from the upper 50s north to the middle 60s south, with highs on
Monday a few degrees cooler than on Sunday with less afternoon
sunshine. Also, while the timing is still a bit uncertain, scattered
showers and thunderstorms may reach the CWA during the afternoon
hours, while the threat for any severe weather or heavy rainfall and
potential flooding concerns should hold off until Monday night and
Tuesday. Nevertheless, by Monday night PoPs should range from 30 to
40 percent across the SE 1/3 of the region, then gradually increase
to 40 to 60 percent across most of the CWA, with even some 70 to 80
percent rain chances across SE AL and the western FL Panhandle by
close to sunrise on Tuesday morning.
.Long Term [Tuesday Through Saturday]...
After our reasonably long respite from the unsettled weather (given
the nature of the extremely progressive and active upper level
pattern this spring) which has lasted from last Wednesday through
the first half of this weekend, signs of yet another developing
shortwave to our west are already taking shape to impact our weather
early next week. As was the case on Friday, the Global models are
still in reasonable agreement of a steep upper level trof carving
its way down to the northern Gulf coast on Tuesday into Wednesday
before gradually pulling away to our NE. The main differences
between the GFS and ECMWF are the timing and duration of this
potential severe weather and likely heavy rainfall maker, with the
ECMWF leaning towards a more bleak solution, with the possibility of
a very heavy round or two of precip both over our CWA and upstream,
which would exacerbate the flooding on many of our rivers and
streams which are still quite high and recovering from the last
flooding event. For now, the GFS is significantly faster, and while
both models could still pose a severe weather threat (which we will
be examining more closely over the next couple of days), the overall
flooding impacts would be lower given the GFS solution with any
significant impacts likely over by the end of the day on Tuesday.
Thereafter, fair and near seasonable conditions should return for
the balance of the week, with the next chance for inclement weather
returning on Friday into Saturday.
Generally light east to southeasterly winds this evening are
expected to increase to just below cautionary levels late tonight
into Sunday as the pressure pattern briefly tightens. Then, onshore
winds and seas will remain light to moderate through Monday before
increasing to at least cautionary levels out of the southwest on
Monday night into Tuesday out ahead of the next low pressure system
and cold frontal boundary. In its wake, cautionary to possibly
advisory level offshore winds and seas are expected to move into the
marine area on Tuesday night into Wednesday.
Relative humidity levels will remain above critical thresholds for
the next several afternoons. Some high dispersions are possible in
parts of our Florida zones on Sunday. The next wetting rains should
arrive late Monday and Tuesday.
Most rivers have reached their peak and are generally falling. The
only exceptions are the Choctawhatchee River at Bruce and
Ochlockonee River at Havana. The Ochlockonee River at Concord is
continuing a broad crest today and the Withlacoochee at Valdosta
peaked right at minor flood stage early this morning.
The next chance of rainfall is Monday through Tuesday night. At this
time the system looks progressive enough to keep rainfall totals
around 1.5-3", with higher rainfall totals north and west of the
line from Apalachicola to Tallahassee to Fitzgerald. These totals
will be too low for flash flooding to be a main concern...however,
this may slow the decreases on already swollen rivers and may even
cause a few to return to bankfull or minor flood stage by later in
The most up to date, specific river forecast information can be
found on the AHPS page at
.Preliminary Point Temps/PoPs...
Tallahassee 56 84 61 83 64 / 0 0 10 30 40
Panama City 62 79 64 77 64 / 0 0 10 30 60
Dothan 58 83 60 80 59 / 0 0 10 50 70
Albany 57 82 59 80 61 / 0 0 10 30 60
Valdosta 56 87 60 85 63 / 0 0 10 20 40
Cross City 55 84 61 83 64 / 0 0 10 20 30
Apalachicola 63 78 65 77 66 / 0 0 10 30 50