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

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FXUS64 KEWX 182039
AFDEWX

Area Forecast Discussion
National Weather Service Austin/San Antonio TX
239 PM CST Tue Dec 18 2018

.SHORT TERM (Tonight through Wednesday Night)...
After a stubborn morning with dense fog, mostly cloudy conditions are
prevailing across much of the area with temperatures in the 50s and
60s. A strong shortwave trough is moving into West Texas at the
present time and we can see the effects of this system evident on
radar as a thin band of light rain is beginning to enter northern Val
Verde County. Lift associated with this system will continue to
spread east this afternoon and evening. There are also some coastal
light rain showers to our southeast. This area of low-level lift will
continue to move north and become enhanced as the deep lift from the
upper low arrives to the eastern half of the area. This should equate
to a decent coverage of light rain showers for the eastern areas
tonight. PoPs will range from from 20 percent in the west to 70s
across the northeastern CWA. Rainfall amounts will range from a trace
to about a half of an inch with the highest totals once again in the
northeast CWA. In addition, models are showing widespread fog in the
morning once again. However, the low-level lift and precip chances
either should primarily keep things are low clouds, or if fog does
develop, keep the visibility higher and widespread dense fog at bay.
For now, will include the mention of patchy fog across much of the
area and future shifts can update as needed. Lows tonight will bottom
out in the 40s and 50s.

Scattered rain showers will remain possible through the late morning
hours across the eastern CWA as the upper low exits the region.
Northwest winds will move in behind a surface low tomorrow afternoon
with some clearing expected from west to east. Highs tomorrow will
top out in the 60s. A stronger cold front with northerly winds will
move in Wednesday night behind the upper trough axis.

&&

.LONG TERM (Thursday through Tuesday)...
These northerly winds Thursday afternoon will be around 20-25 MPH for
much of the area and close to wind advisory levels. In addition, the
afternoon humidity values will drop to 22-32 percent which should
lead to elevated fire weather conditions across much of the CWA. The
drier air will be located across the western CWA. Dry weather is then
expected through the weekend with highs in the 60s and lows in the
30s and 40s. Another dry cold front will move through the area
Saturday night, but southerly flow returns again on Monday as
southwest flow aloft sets up over the region. This upper air pattern
with embedded troughs will bring low rain chances again on Monday
and Tuesday.

&&

.PRELIMINARY POINT TEMPS/POPS...
Austin Camp Mabry              51  66  48  62  41 /  60  30   0   0   0
Austin Bergstrom Intl Airport  51  66  47  63  39 /  60  30   0   0   0
New Braunfels Muni Airport     51  66  47  63  39 /  40  20   0   0   0
Burnet Muni Airport            48  64  44  59  36 /  50  30   0   0   0
Del Rio Intl Airport           45  70  45  67  38 /  10   0   0   0   0
Georgetown Muni Airport        49  65  46  60  38 /  70  30   0   0   0
Hondo Muni Airport             49  70  46  67  37 /  20  10   0   0   0
San Marcos Muni Airport        51  67  47  63  39 /  50  20   0   0   0
La Grange - Fayette Regional   53  66  48  62  39 /  60  40  -    0   0
San Antonio Intl Airport       51  67  49  64  41 /  30  20   0   0   0
Stinson Muni Airport           53  68  49  65  41 /  30  10   0   0   0

&&

.EWX WATCHES/WARNINGS/ADVISORIES...
None.
&&

$$

Aviation...Treadway
Short-Term/Long-Term...Hampshire
Public Service/Data Collection...10


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