Area Forecast Discussion
Issued by NWS Huntsville, AL

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FXUS64 KHUN 040446
AFDHUN

Area Forecast Discussion
National Weather Service Huntsville AL
1046 PM CST Sat Dec 3 2016

.UPDATE...
For 06Z TAFS.

&&

.NEAR TERM...(Tonight)
Issued at 900 PM CST Sat Dec 3 2016

Very light rain continues to push across the TN valley this evening.
Expect this rain to continue for the overnight hours as well. Cloud
ceilings attm were arnd 6000 ft but are progged to lower after
midnight which may help to produce a little heavier rain rates. With
the cloud cover and rain, temps should stay about where they are now,
in the low 40s. Some locations may actually rise a degree or two
overnight. Anyhow the current fcst looks good and no changes are
planed attm.

.SHORT TERM...(Sunday through Tuesday)
Issued at 302 PM CST Sat Dec 3 2016

Wet. This will be the primary weather across the area into the first
portion of next week. The upper low will move across northern Mexico
into Monday. As it moves across southern Texas, it will spawn surface
low development over Deep South Texas. This low will track to the
northeast across the Deep South and Tennessee Valley, continuing to
bring widespread showers to the area. The surface low should reach
the southern Great Lakes on Tuesday, with rain chances diminishing
somewhat during Tuesday. Before then, a deeper influx of moisture
from the Gulf as well as increased instability should yield isolated
thunderstorms during Monday afternoon and Monday night. Unlike
earlier this week, main threats from any storms that occur will be
locally heavy rainfall and gusty winds.

Total rainfall across the area through Tuesday should range from 1-3
inches, with locally higher amounts possible. Even with the heavy
rains from the storms earlier this week, the ground overall is still
on the dry side, and can probably absorb this moisture (provided it
doesn`t all come at once). The heavier showers could pose runoff
issues mainly in the short term. If the higher end of rainfall
amounts occurs, some hydrological issues (higher stream levels) could
result.

.LONG TERM...(Tuesday night through Friday)
Issued at 302 PM CST Sat Dec 3 2016

Dry conditions are in store Tuesday night into Wednesday as
the upper-level low slingshots off to the northeast. Another system
is not far behind, as an amplified trough moves into the region on
Wednesday.

Wednesday will warm up into the low/mid 50s before cloud cover
further increases and precip arrives ahead of the arctic cold front
Wednesday evening. As temperatures fall down into the low/mid 30s
near daybreak Thursday morning, there could be a small window to see
snow mixing with rain. Exact timing of the front still differs
between the models and could make or break the chance to see this
wintry precip mix. Also, the ECMWF is slower and holds onto the
moisture longer than the GFS at this time, but the GFS still shows a
small window Thursday morning before drying out quickly. The main
batch of precip will be Wednesday night into Thursday with the cold
front arriving Thursday morning. The models do agree that overall,
the cold front will push the rain out of the forecast area by
Thursday evening with cold, dry air filtering in behind it.

Thursday`s highs, not lows, will be in the lower 40s with the
overnight lows tanking into the teens to lower 20s across the board
with the help of mostly clear skies. Friday will be precip free and
cold with highs in the 30s and lows around 20 degrees again.

&&

.AVIATION...(For the 06Z TAFS through 06Z Sunday night)
Issued at 1045 PM CST Sat Dec 3 2016

A large upper low, now over the BAJA peninsula of Mexico, will
continue to pump moisture across the Tn valley overnight and into Sunday.
This will keep the chc of rain and low clouds over the taf sites for much
of the fcst period. However new NAM model data shows that there
could be a break in the rain beginning arnd 21z and continuing thru
the end of the fcst period. Otherwise expect mainly ifr conditions
for the next 24 hours at both KMSL and KHSV.

&&

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

$$

NEAR TERM...007
SHORT TERM...RSB
LONG TERM...JMS
AVIATION...007


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