Area Forecast Discussion
Issued by NWS
FXUS62 KTAE 161111
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TALLAHASSEE FL
611 AM EST Sun Nov 16 2014
...ISOLATED SEVERE STORMS ARE POSSIBLE MONDAY...
...HARD FREEZE LOOKING MORE LIKELY TUESDAY NIGHT FOR A LARGE
PORTION OF THE AREA...
[Through 12Z Monday] MVFR cigs in the early morning hours at eastern
terminals (VLD, TLH, and ABY) will improve to VFR by around 15-16Z,
MVFR cigs will build again between 00-04Z, this time from the west
ahead of our next cold front. By the end of the period, we will
begin to see thunderstorms with IFR cigs possible, particularly at
the eastern terminals.
.Prev Discussion [425 AM EST]...
.Near Term [Through Today]...
High pressure will continue to slide eastward today, shifting
winds from easterly to southerly. The easterly winds have already
begun to bring some moisture from the Atlantic coast back into the
area, increasing low level cloudiness overnight in southwest
Georgia and the Big Bend. As the flow shifts to the south, warm,
moist air from the Gulf will continue to help increase
temperatures. Highs today will be in the upper 60s to around 70 in
southeast Alabama and southwest Georgia, 70 to 75 in the Florida
Panhandle and Big Bend. Although the low level clouds in our
eastern zones will burn off in the morning, cloud cover will begin
to build from the west this afternoon ahead of an approaching cold
front. We could begin to see showers and thunderstorms from this
system late tonight.
.Short Term [Tonight Through Tuesday]...
For tonight and Monday, not much has changed from the previous
thinking. The main question will be the recovery of the low level
airmass from its current cool and rather dry state as both low
level and deep layer shear looks like they will be sufficient to
support severe weather. In terms of instability, guidance agrees
that will be a narrow band of surface-based instability near the
Gulf coast Monday morning with dewpoints recovering to the mid
60s. The CAM ensemble responds with SBCAPE values near 1000 j/kg
along the coast with lesser values farther inland. With 0-1 km
shear near 30 knots and 0-6 km shear near 50 knots expected, some
severe weather is possible, including the potential for an
isolated tornado or two. SPC has outlooked most of the area for a
slight risk of severe storms for Monday. As the front moves
through the area during the day, temperatures will be falling
during the afternoon behind it with gusty northwest winds. As an
example, the Dothan area is expected to start Monday morning in
the lower 60s and end the day in the upper 40s.
For Monday night and Tuesday, a much colder airmass will continue
to advect into the area behind the front. With strong cold
advection occurring, the official forecast used more of a raw
model blend instead of MOS, although MOS was not overly different
in this case. A light freeze is a distinct possibility across
portions of the area Monday night followed by a very cold day on
Tuesday relative to average with highs struggling to even reach
50. The northern portions of the forecast area may stay in the mid
to upper 40s.
.Long Term [Tuesday Night Through Sunday]...
A very cold and dry airmass will be in place at the start of the
period with a widespread freeze likely on Tuesday night and again
on Wednesday night. In fact, hard freeze conditions (locally
defined as below 26 degrees for at least 2 hours) are looking more
likely for Tuesday night across a large part of the area with
center of the surface high pressure in a favorable area. These
temperatures are around 20 to 25 degrees below average for this
time of year. A gradual moderation is expected for the end of the
By next Sunday, the 00z GFS, Euro, and Canadian all have a rather
strong system developing west of the area which could bring
another round of storms just beyond the day 7 period into early
Winds will veer to southeasterly today and then southerly tonight
and increase to exercise caution levels overnight. Advisory level
conditions are expected on Monday just ahead of a strong cold
front as well as behind the front as winds shift to the
northwest. Strong offshore flow will continue into Tuesday before
diminishing into Wednesday as high pressure builds over the
A cold front will cross the area tonight through Monday night,
with an arctic airmass pushing into the area in its wake. On
Tuesday and Wednesday, a much colder, drier airmass will be in
place over the tri-state area, but it may be too cold for relative
humidity values to dip to red flag criteria for the durations
Sunday night and Monday rainfall amounts will generally be
between 0.5 and 1.25 inches, with the highest amounts over SE
Alabama and the Florida Panhandle. With current river levels
quite low, these amounts are not expected cause any problems.
.Preliminary Point Temps/PoPs...
Tallahassee 71 61 69 32 49 / 0 30 90 10 0
Panama City 70 66 68 35 49 / 0 60 100 10 0
Dothan 68 61 62 27 45 / 10 70 100 10 0
Albany 69 60 63 28 45 / 10 50 100 10 0
Valdosta 70 60 70 32 48 / 0 20 90 40 0
Cross City 75 62 72 39 52 / 10 10 80 50 0
Apalachicola 69 66 70 37 50 / 10 40 90 10 0