Area Forecast Discussion
Issued by NWS Austin/San Antonio, TX

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FXUS64 KEWX 221938

Area Forecast Discussion
National Weather Service Austin/San Antonio TX
138 PM CST Sun Nov 22 2020

.SHORT TERM (Tonight through Monday Night)...

A weak cold front sits just north of our CWA currently. A general
consensus was for the front push further into South Central Texas
before dissolving. There has been very little progression with this
front this morning and early afternoon. Deep moisture has allowed
for light shower activity in our eastern counties, as well as along
the front. As clouds scatter out in some areas this afternoon ahead
of the front, widespread low clouds will be carried in behind the
front as it slowly progresses. Northeasterly winds behind the front
will bring in slightly drier and cooler air, though not enough for
any long term lowered temperatures. Tonight, lows in the 50s with
mostly cloudy skies. Tomorrow, the winds return back out of the
southeast, and temperatures will have only dropped a few degrees
with highs in the low 70s in the Hill Country and mid to upper 70,
elsewhere. Tomorrow night, the abundant return of moisture will
bring back patchy fog overnight.


.LONG TERM (Tuesday through Sunday)...

Tuesday morning, the upper level pattern is expected to consist of
ridging over the OH Valley and a trough pushing across the Rockies.
In response to this trough, ongoing lee cyclogenesis will lead to
strengthening southerly flow over south-central TX. Some isolated
streamer shower activity is possible in the morning over the Hill
Country and along and east of I-35. Breezy conditions are expected
during the day with sustained 10-20 mph southerly winds gusting to
25-30 mph, and this will help bring well-above normal temperatures
into the 75-85 degree range.

As the low pushes across the Plains towards the Great Lakes Tuesday
night and Wednesday, it will send a cold front across our region.
NAM frontal timing suggests the front will be about halfway through
the CWA at 12Z Wed. Some shower activity is possible along the front
mainly east of I-35 in the early morning, and an isolated
thunderstorm cannot be ruled out across our far eastern zones, but
in general its not expected to bring much in the way of
precipitation. Cooler highs in the upper 60s to near 80, then
overnight lows into the 40s and lower 50s for Thanksgiving morning.

By Thursday afternoon, as post-frontal high pressure exits to the
northeast, southerly flow will begin to return and as a result temps
will again warm into the 70s and lower 80s for most on Thanksgiving
Day and Friday. Another, more potent trough and cold front are
expected to move across the central US on Friday and Friday night,
this time with better chances for appreciable rainfall (>0.5")
across primarily eastern portions of the region ahead of and along
the front.

While confidence is moderate to high in cooler temperatures for next
weekend, confidence in rainfall is lower due to the tendency for
global guidance to overestimate precip this far south after day 5.
Could be our best chance for thunderstorm activity in over two
months, but no guarantee right now. At this time, the GFS solution
has become more progressive, with the front and any associated precip
long gone by sunrise Saturday, while the ECMWF and CMC are both
slower with this system and thus keep precipitation in the forecast
into the early part of next weekend. Any rain we can get would be
quite helpful, but it appears chances are very slim for any notable
accumulations across the areas that need it most (west of San
Antonio) over the next 7 days. Either way, overnight lows Sunday and
Monday morning next week will again dip into the 30s over the Hill


.PREV DISCUSSION... /ISSUED 1120 AM CST Sun Nov 22 2020/

Widespread, multi-layered clouds are draped across Texas. Terminals
are slowly recovering from IFR conditions from this morning. A slow
improvement over the next couple of hours will then be short-lived.
A weak front will reach the area later this afternoon and give a more
easterly wind component. AUS looks to be the only site that has a
shot of a stray shower with this front this afternoon, but with
minimal chances have left out the mention of precip in the TAF.
Anticipating another round of low stratus overnight tonight with
IFR/MVFR ceilings building in.


Austin Camp Mabry              53  72  61  80  55 /  -    0  -   10  20
Austin Bergstrom Intl Airport  52  74  60  81  54 /  -    0  -   10  20
New Braunfels Muni Airport     56  77  63  84  59 /  10   0  -   10  10
Burnet Muni Airport            50  69  60  78  50 /  -   -   -   10  20
Del Rio Intl Airport           60  77  63  84  54 /  20  10  -    0   0
Georgetown Muni Airport        50  71  59  79  52 /  -    0   0  10  20
Hondo Muni Airport             55  77  61  84  56 /  10  -   -   10  -
San Marcos Muni Airport        53  75  60  81  56 /  10   0  -   10  20
La Grange - Fayette Regional   55  76  61  81  59 /  -    0   0  10  20
San Antonio Intl Airport       55  75  63  81  59 /  10   0  10  10  10
Stinson Muni Airport           56  77  63  83  59 /  10   0  10  10  10




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