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

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FXUS64 KEWX 131137
AFDEWX

Area Forecast Discussion
National Weather Service Austin/San Antonio TX
637 AM CDT Sun Aug 13 2017

.AVIATION...
Some patches of MVFR clouds are moving in the vicinity of AUS and may
occasionally drop the CIG there until around 14Z. Otherwise, all area
airports will be VFR today. MVFR CIGs will develop overnight in
Austin and San Antonio and last until late morning Monday. DRT will
be VFR for the entire TAF period.

&&

.PREV DISCUSSION... /ISSUED 349 AM CDT Sun Aug 13 2017/

SHORT TERM (Today through Monday)...
A weak eastward moving shortwave is passing by to the north with a
surface boundary stalled across Central into Western Texas generating
showers and thunderstorms there. Expect no movement southward and
thus, no impacts to South Central Texas. Mid and upper level ridging
remains over our area, though with a slight erosion over Central
Texas to northern portions of the Rio Grande as an upper level trough
moves into the western states. Thermal ridging continues over our
area along with elevated heat index values as mixing of dewpoints is
not as efficient due flow off the Gulf of Mexico during the afternoon
into evening. Another Heat Advisory has been issued for areas along
and southeast of a Karnes City to La Grange line due to heat index
values at or above 108 for a few hours this afternoon into early
evening. May have to issue another for Monday afternoon, though will
address that in later forecasts.

LONG TERM (Monday Night through Saturday)...
The upper level trough moves out across the Rockies and Plains mid
week. A weak shear axis extending to the southwest from the trough
will bring chances of showers and thunderstorms to Val Verde County
Tuesday night into Wednesday. A westward moving TUTT low passing to
south of our area on Wednesday will enhance the seabreeze to generate
slight chances of showers and thunderstorms to areas near the Coastal
Plains. The mid and upper level ridge strengthens over our area late
week into next weekend with no rain expected. Heat index values could
flirt with advisory levels for the next several days, especially in
areas near the Coastal Plains. Looking ahead to the solar eclipse on
Monday, August 21st, models currently show mostly sunny skies with
some stratus early in the day.


&&

.PRELIMINARY POINT TEMPS/POPS...
Austin Camp Mabry             100  78 101  77  99 /   0   0   0   0  -
Austin Bergstrom Intl Airport 100  77 100  76  98 /   0   0   0   0  -
New Braunfels Muni Airport    100  77 100  76  99 /   0   0   0   0  -
Burnet Muni Airport            98  75  97  74  96 /  10   0  -    0   0
Del Rio Intl Airport          103  77 101  79 100 /   0   0   0   0  -
Georgetown Muni Airport        99  77  98  76  98 /  10   0  -    0  -
Hondo Muni Airport            101  76 101  75 101 /   0   0   0   0   0
San Marcos Muni Airport       100  77  99  76  99 /   0   0   0   0  -
La Grange - Fayette Regional   99  78  99  77  98 /  -   -   -   -   -
San Antonio Intl Airport      100  78 100  77  99 /   0   0   0   0   0
Stinson Muni Airport          103  77 102  77 101 /   0   0   0   0   0

&&

.EWX WATCHES/WARNINGS/ADVISORIES...
Heat Advisory from 1 PM this afternoon to 7 PM CDT this evening for
the following counties: De Witt...Fayette...Gonzales...Karnes...
Lavaca.

&&

$$

Mesoscale/Aviation...05
Synoptic/Grids...04



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