Area Forecast Discussion
Issued by NWS Huntsville, AL

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031
FXUS64 KHUN 242343
AFDHUN

Area Forecast Discussion
National Weather Service Huntsville AL
543 PM CST Fri Nov 24 2017

.UPDATE...
For 00Z TAFS.

&&

.NEAR TERM...(Tonight)
Issued at 135 PM CST Fri Nov 24 2017

Models move the area of high pressure over Alabama/northern Georgia
further southeast into southern Georgia tonight. As a cold front
continues to move east into the central Great Lakes region, S to SW
flow will increase a bit as gradient winds begin to strengthen. This
will advect somewhat warmer and more moist air into the region from
the Gulf of Mexico. Based on current dewpoints over the area and
upstream to our southwest, lows in the 40 to 45 degree range look
possible despite light winds and increasing clouds (especially in
northwestern Alabama) tonight. There looks to be deep enough moisture
aloft above 700 mb to produce mostly cloudy conditions over
northwestern Alabama after midnight tonight. By daybreak, expect
these mostly cloudy conditions to spread east across northeastern
Alabama.

.SHORT TERM...(Saturday through Sunday night)
Issued at 135 PM CST Fri Nov 24 2017

Warm air and increasing moisture advection continues into Saturday,
as the southwest portion of the approaching frontal boundary moves
into the Tennessee Valley. Some guidance is forecasting a few
isolated showers along this front during the day as it pushes into
the area. However, based on the very dry air that is forecast to be
in place between 925 mb and 700 mb, not sure we will see any
precipitation make it to the ground. Thus, keeping isolated showers
out of the forecast, as has previous shifts. Expect warmer
temperatures on Saturday despite abundant cloud cover with highs in
the 60 to 65 degree range near and south of the Tennessee River (via
westerly flow just ahead of the front.

Some colder and drier air is expected to push south behind the front
on Saturday night and Sunday. Highs falling back into the 50s (some
lower 50s) look reasonable given decent advection and forecast 925 mb
temperatures. Lows should fall back into the lower 30s as well Sunday
night.

.LONG TERM...(Monday through Thursday)
Issued at 135 PM CST Fri Nov 24 2017

As we start the work week, global guidance is in good agreement with
the synoptic pattern. Models are depicting the remnant of a
mid/upper level wave progressing through the SE US, with deep layer
ridging quickly building in on the back side. Plenty of dry air and
subsidence lingering over the region will keep rain chances near 0
percent. Low level flow becoming more southerly Mon-Wed will help
trend toward warmer temps, potentially reaching the mid 60s area-wide
on Wednesday.

Expect a transition in overall pattern beginning Wed evening. Model
guidance starts to diverge with the position, timing, and intensity
of the next system progged to encroach on the region at the tailend
of the period. 12z Euro guidance has sped up from the previous run,
now pushing a potential potent front with upper level support for a
few storms on Thursday. However, much like the GFS, there has been a
lack of continuity on the back end of the forecast, regarding this
system. As such, have left out thunderstorms for Thursday but
maintained at least chance PoPs (around 30 percent).

&&

.AVIATION...(For the 00Z TAFS through 00Z Saturday evening)
Issued at 543 PM CST Fri Nov 24 2017

Light southerly winds and VFR weather will prevail through the TAF
period. A cold front approaching from the northwest will move across
the region Sat afternoon, resulting in winds becoming northwesterly
5-10kt. Given dry air on either side of the front, no significantly
lowered CIGs and/or precipitation is expected.

&&

.HUN WATCHES/WARNINGS/ADVISORIES...
AL...NONE.
TN...NONE.
&&

$$

NEAR TERM...KTW
SHORT TERM...KTW
LONG TERM...Barron
AVIATION...RSB


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