Area Forecast Discussion
Issued by NWS Birmingham, AL

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FXUS64 KBMX 080551
AFDBMX

Area Forecast Discussion
National Weather Service Birmingham AL
1151 PM CST Wed Dec 7 2016

.UPDATE...
For 06Z Aviation.

&&

.SHORT TERM...
Through Friday night.

As a result of saturated low levels, stratus has remained across
much of the area today. These clouds have kept afternoon temperatures
in the upper 40s to lower 50s. Temperatures will cool into the mid
30s north to lower 40s south tonight, ahead of an approaching
moisture-starved front. This front will push into Central Alabama
early Thursday morning. Not much more than a band of mid level
moisture will accompany the front, and will maintain low rain
chances.

After days of cloud cover, the good news is the clouds should
finally move out of the area tomorrow afternoon as much drier air
advects southward behind the front. Surface winds will increase
behind the front with speeds in the 10-15 mph range. As a strong
surface ridge drops into the eastern CONUS from central Canada, the
coldest air mass of the season will invade Alabama. Overnight lows
Thursday night in the 20s and brisk winds will result in wind chills
in the teens Friday morning for most of the area.
Temperatures should warm above freezing by mid to late morning, with
afternoon highs in the upper 30s to upper 40s. Friday will be the
coldest day of the forecast period. Overnight Friday, with the
surface high settling over the Tennessee Valley, lows once again
will be in the 20s Saturday morning, and would not be surprised to
see upper teens across the far north.

14/58

.LONG TERM...
Saturday through Tuesday.

Temperatures moderate Saturday afternoon and Sunday as low level
winds veer to the southeast and south ahead of the next front.
Models show broad troughing across much of the CONUS early next
week, with a shortwave dropping across the Ohio River Valley.
There is a large discrepancy in strength and timing of the
shortwave, and location and track of a developing surface low.
Both of which would have a great impact on when rain chances
return to the area. Will maintain rain chances returning Sunday
night and exiting Monday afternoon for now.

14


&&

.AVIATION...
06Z TAF Discussion.

A large area of stratus and stratocumulus remain across Central
Alabama, but the edge is near the northern terminals at this
writing. These ceilings are MVFR 015-025. The northern terminals
should see the ceilings erode in the next hour or two and the
southern sites by around 10z or so. These MVFR ceilings will
be replaced with higher moisture from 050-070, albeit with a
potential break of an hour or two.

Another cold front/trough will move through the northern sites
shortly and be coincident with the the MVFR ceilings eroding.
This boundary will be the leading edge of much cooler and drier
air and it will infiltrate the area the remainder of the period.
The lower layers of the atmosphere will eventually dry out and
ceilings will rise to only cirrus by around 18z. Winds start off
west northwest around 4-6kt slowly transition to northwest. After
16-17z, winds become northerly and gusty, with some gusts reaching
20-22kts. The gust subside after 00z but winds remain between
6-9kts through 06z.

75

&&

.FIRE WEATHER...

A strong cold front will push through central Alabama on
Thursday. The air mass will be too dry for any appreciable
rainfall with the frontal passage. Much colder air will move into
the area Thursday through Saturday. RH values will drop below 25
percent Saturday afternoon for portions of the area for several
hours. However, winds will be light. Moisture begins to increase
Saturday night with rain chances returning Sunday and Monday.

&&

.PRELIMINARY POINT TEMPS/POPS...
Gadsden     36  46  22  41  19 /  20  20  10   0   0
Anniston    38  47  23  42  22 /  10  20  10   0   0
Birmingham  38  46  24  42  23 /  10  20  10   0   0
Tuscaloosa  39  48  24  43  21 /  20  20  10   0   0
Calera      39  48  25  43  22 /  10  20  10   0   0
Auburn      42  52  26  44  25 /   0  20  10   0   0
Montgomery  42  54  27  46  23 /  10  20  10   0   0
Troy        41  54  27  46  21 /   0  10  10   0   0

&&

.BMX WATCHES/WARNINGS/ADVISORIES/...
None.

&&

$$


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