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

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FXUS64 KEWX 162051
AFDEWX

Area Forecast Discussion
National Weather Service Austin/San Antonio TX
251 PM CST Sat Dec 16 2017

.SHORT TERM (Tonight through Sunday Night)...
Water vapor satellite images show an upper level low pressure system
moving over west Texas and to the northeast. All HiRes and medium-
range models agreed on continuing to bring this system to the
northeast and into the Southern Plains this evening as it opens into
an upper level short-wave. As the upper level system moves to the
northeast for the rest of this afternoon and evening, light to
moderate rain is expected across the eastern two-thirds of South
Central Texas. There will be a window late this afternoon and early
evening for isolated thunderstorms mainly along and east of
Interstate 35 as an upper level wind speed maxima moves across the
area. Also, it could enhance any activity for the period and result
in periods of heavy rain.

Overall, rainfall amounts should stay in the half to one inch range
especially along and east of I35 with the potential for up to two
inches of rainfall along and east of Highway 77.

The rain chances come to an end from west to east this evening with
rain-free weather over all areas overnight tonight. Due to a warm
night and wet surfaces, expect patchy fog to develop late tonight
across much of South Central Texas.

Sunday should be dry with clouds lingering all day across the eastern
counties and highs in the 60s.

&&

.LONG TERM (Monday through Saturday)...
Another upper level low pressure system is forecast to slowly move
across the four corners region on Monday and brings showers and
thunderstorms across the area for the first part of next week. A cold
front passage will enhance the chances for rain on Tuesday. The cold
front and upper level energy will move to the east and southeast
with dry weather expect for Wednesday and Thursday.

Yet, another upper level disturbance and a much strong cold front is
expected on Friday. A cold airmass will spread across the area for
next weekend with lows in the 30s and highs only in the 40s.

There is still a lot of uncertainty for the extended forecast period
as far as the type of precipitation we will get if moisture is
around. We will be closely monitoring model guidance and adjusting
the forecast as you plan for the Christmas holiday weekend.


&&

.PRELIMINARY POINT TEMPS/POPS...
Austin Camp Mabry              43  65  52  64  57 / 100   0  10  30  50
Austin Bergstrom Intl Airport  42  64  51  64  58 / 100   0  10  30  50
New Braunfels Muni Airport     42  64  52  66  59 /  90   0  10  30  50
Burnet Muni Airport            41  64  48  62  55 /  80   0  -   30  40
Del Rio Intl Airport           41  59  47  64  53 /  -    0  -   10  30
Georgetown Muni Airport        42  64  49  62  55 / 100   0  10  30  50
Hondo Muni Airport             41  62  51  65  58 /  40   0  10  30  40
San Marcos Muni Airport        42  64  51  65  59 / 100   0  10  30  50
La Grange - Fayette Regional   43  65  53  67  61 / 100   0  20  40  50
San Antonio Intl Airport       44  64  53  66  60 /  80   0  10  30  40
Stinson Muni Airport           43  63  54  66  60 /  80   0  20  30  40

&&

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

$$

Mesoscale/Aviation...Hampshire
Synoptic/Grids...17
Public Service/Data Collection...30


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