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

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FXUS64 KEWX 181014
AFDEWX

Area Forecast Discussion
National Weather Service Austin/San Antonio TX
414 AM CST Thu Jan 18 2018

.SHORT TERM (Today through Friday)...
Another cold night across the area especially the northeast part of
the Hill Country where temperatures are in the lower to mid 20s as
of 4 am. The Rio Grande Plains and southern Edwards Plateau are a
bit warmer since clouds lingered around for a longer period of time
yesterday and therefore, radiational cooling less effective there.
However, temperatures are still expected to bottom down to the upper
20s and lower 30s by dawn as an upper level disturbance moves across
south central Texas this morning. Most HiRes models suggest a narrow
band of wintry mix pushing across portion of Val Verde county into
the southern Edwards Plateau this morning. With such a dry airmass in
place and dewpoints in the single to the mid teens digits, we are
not expecting accumulation of any winter type precipitation.

Temperatures rebound to above freezing by noon time today everywhere
and reach the mid 40s most areas by mid afternoon. Cloudy skies will
prevail across the area for much of today with some clearing out
west late this afternoon.

The eastern two-thirds of south central Texas remains cloudy this
evening into Friday morning as increased moisture surges to the
north and into our area as a coastal low pressure system develops
ahead of the upper level disturbance mentioned above and forecast to
move east into east Texas by noon on Friday.

&&

.LONG TERM (Friday Night through Wednesday)...
By Friday evening into Saturday morning, the coastal low dissipates
and a strong low level jet develops and brings 30 to 40 mph across
the eastern half of south central Texas with chances of rain mainly
along and east of Highway 183. Clearing is expected from west to east
mid morning Saturday with some clouds linger over the far east for
the afternoon period. A nice warmup is also anticipated with highs in
the mid 60s to lower 70s.

Chances for rain return early Sunday as a Pacific cold front moves
across the area. This front is forecast to exit the far east of south
central Texas by the early evening hours. There is enough instability
according to forecast soundings for isolated thunderstorms to occur
late afternoon into early evening along and east of Highway 183.

Once the front pushes to the east and away from the area, dry weather
conditions are expected for the remainder of the week with cool
nights and warm days.

&&

.PRELIMINARY POINT TEMPS/POPS...
Austin Camp Mabry              44  34  49  45  68 /  -   10  20  10  10
Austin Bergstrom Intl Airport  43  32  48  44  67 /  -   10  20  20  10
New Braunfels Muni Airport     44  34  49  43  67 /  10  10  30  10  10
Burnet Muni Airport            43  30  51  42  67 /   0   0   0  -    0
Del Rio Intl Airport           47  29  58  38  66 /  10   0   0   0   0
Georgetown Muni Airport        44  31  49  44  67 /  -   -   10  10  10
Hondo Muni Airport             45  34  52  39  67 /  10  10  10   0  -
San Marcos Muni Airport        43  33  48  43  67 /  10  10  30  10  10
La Grange - Fayette Regional   43  34  49  46  67 /  -   10  40  30  20
San Antonio Intl Airport       44  36  50  43  67 /  10  10  20  -   10
Stinson Muni Airport           44  35  50  42  67 /  10  20  20  10  10

&&

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

$$

Mesoscale/Aviation...04
Synoptic/Grids...17



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