Area Forecast Discussion
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181
FXUS62 KTAE 220929
AFDTAE

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TALLAHASSEE FL
429 AM EST Thu Jan 22 2015

...LOCALLY HEAVY RAINFALL LIKELY ON FRIDAY WITH A MARGINAL RISK OF
SEVERE STORMS...

.Near Term [Through Today]...
As the low pressure system begins to develop over the western gulf
and move east, a few showers may reach our western zones by late
afternoon or evening. Otherwise, mid and upper level clouds will be
on the increase. Despite the cloud cover, temps will be above
seasonal levels for one more day with highs mainly in the upper
60s to lower 70s.


.Short Term [Tonight Through Saturday]...
A vigorous upper level trough will aid in the development of a
surface low west of the area tonight that will move across the
area on Friday, bringing the threat of heavy rainfall and maybe a
few thunderstorms.

Confidence is fairly high that a widespread 1.5-3" rainfall will
occur with locally higher amounts. Precipitable water values are
expected to rise to around the 99th percentile for January, and a
large shield of moderate to heavy rain is likely north of the warm
front, which will be situated near the coast. In addition, with
the unseasonably high atmospheric moisture content, thunderstorms
will be efficient rainfall producers. Most of the guidance members
(both global and locally run CAMs) are in decent agreement on the
large scale rainfall amounts.

The threat of severe storms is much less certain. Currently, the
SPC day 2 outlook calls for a marginal risk of severe storms, and
this looks reasonable. This is a very typical cool season low
CAPE/high shear scenario for our area. If the warm front can lift
northward away from the coast, then the threat of severe weather
would increase across the area with more instability. However, it
is not certain whether or not that will occur. Many times the warm
front stays pinned near the coast with the severe threat limited
to just the coastal areas. However, this is a fairly dynamic
system and shear values will be high, so mesoscale trends will
have to be monitored closely on Friday as there could be threat of
damaging winds or an isolated tornado or two if enough instability
can penetrate inland.

This system will begin to exit the area on Friday night with a
return to dry conditions on Saturday.


.Long Term [Saturday Night Through Thursday]...
After the wet system on Friday, upper level northwest flow with a
lack of moisture is expected to allow for dry conditions.
Temperatures are expected to be seasonal.

&&

.Aviation...
[Through 12Z Friday] Occasional MVFR cigs/vsbys until after
daybreak. Then increasing mid to upper level cloudiness today
ahead of a developing low pressure system in the Gulf. A few
showers will be possible mainly western zones by this evening.
Widespread rains for the entire region overnight tonight into
Friday morning accompanied with lowering cigs and vsbys into the
MVFR/IFR range.

&&

.Marine...
Winds and seas are expected to increase to advisory levels
starting this afternoon west of Apalachicola and tonight across
the remainder of the area ahead of a strong frontal system. A few
gusts could reach gale force late tonight through Friday
afternoon. Advisory conditions will continue through Saturday in
the wake of the front, though gusts should fall back below gale
levels. A brief improvement in conditions is expected for Saturday
night and Sunday before a dry cold frontal passage increases the
winds and seas again for early next week.

&&

.Fire Weather...
At this time we are not expecting any fire weather concerns at
least through the weekend.

&&

.Hydrology...
The upcoming system for tonight and Friday is likely to produce a
large area of 1.5-3" of rainfall with locally higher amounts. This
will cause rivers across the area to rise, but most will likely
remain below flood stage. Currently, the most vulnerable basins to
minor flooding appear to be the Ochlockonee and upper
Withlacoochee, and if the localized heavier amounts happen to fall
there, then some minor flooding could occur.

&&

.Preliminary Point Temps/PoPs...

Tallahassee   68  57  65  52  59 /  10  80 100  50  10
Panama City   66  59  66  50  56 /  20  80 100  40  10
Dothan        67  52  57  45  54 /  20 100 100  40  10
Albany        67  52  57  48  55 /  10 100 100  50  10
Valdosta      69  56  65  54  58 /  10  80 100  70  20
Cross City    73  58  68  58  61 /  10  50  80  80  20
Apalachicola  65  61  67  53  59 /  20  70 100  40  10

&&

.TAE Watches/Warnings/Advisories...

FL...None.
GA...None.
AL...None.
GM...Small Craft Advisory from Midnight tonight to 7 PM EST Saturday
     for Apalachee Bay-Coastal waters From Ochlockonee River to
     Apalachicola FL out to 20 NM-Coastal waters from Suwannee
     River to Keaton Beach FL out 20 NM-Waters from Suwannee
     River to Apalachicola FL from 20 to 60 NM.

     Small Craft Advisory from Noon today to 7 PM EST Saturday for
     Coastal waters from Apalachicola to Destin FL out 20 NM-
     Waters from Apalachicola to Destin FL from 20 to 60 NM.


&&

$$

NEAR TERM...BARRY
SHORT TERM...DVD
LONG TERM...DVD
AVIATION...BARRY
MARINE...DVD
FIRE WEATHER...BARRY
HYDROLOGY...DVD






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