702
FXUS64 KEWX 131849
AFDEWX

Area Forecast Discussion
National Weather Service Austin/San Antonio TX
149 PM CDT Sun Sep 13 2026

...New SHORT TERM, LONG TERM, AVIATION...

.KEY MESSAGES...
Updated at 1258 PM CDT Sun Sep 13 2026

- A Heat Advisory is in effect through 7 PM today for areas generally
  along and east of the Interstate 35 corridor. Another Heat
  Advisory has been issued for the same locations Monday from 12
  PM to 7 PM.

- Low rain chances (10-20%) for the I-35 corridor and coastal
  plains through Monday. Then rain chances remain confined to the
  coastal plains through the week.

- Humid morning conditions and above average temperatures continue
  through the the week.

&&

.SHORT TERM...
(Tonight through Monday night)
Issued at 1258 PM CDT Sun Sep 13 2026

The ridge has shifted over North Texas today and will continue an
eastward progression before stalling over the southeastern US
tomorrow into the middle of the week. Continued hot and mainly dry
conditions are forecast in the short term period. Highs will be
similar this afternoon and tomorrow from the mid 90s in the Hill
Country and southern Edwards Plateau to the upper 90s up to 104
degrees elsewhere. For the I-35 corridor and Coastal Plains, heat
index values will rise to Heat Advisory levels from the 108-111
degree range both days. The Heat Advisory remains in effect through
7 PM today and another Heat Advisory has been issued for tomorrow
for the same locations.

The vast majority of the area is expected to remain dry today and
tomorrow, though low (10-20%) chances for rain do exist from the I-
35 corridor into the coastal plains. The coastal plains is the more
likely culprit for any rain due to the seabreeze, but as seen
yesterday cannot rule out a storm or two further west. Any activity
will end near sunset with the loss of daytime heating.

&&

.LONG TERM...
(Tuesday through next Sunday)
Issued at 1258 PM CDT Sun Sep 13 2026

Ridging remains centered over the Lower Mississippi and Tennessee
Valleys through Wednesday, then shifts further west Thursday before
extending back towards South Central Texas late week. Triple digit
heat continues Tuesday for much of the area, then highs ease
slightly mid to late week, though still remain above normal for mid-
September. We`ll need to keep an eye on heat index values Tuesday
and possibly Wednesday as they still creep towards the 105-108
degree mark across the I-35 corridor and coastal plains. Rain
chances remain largely confined to the coastal plains each afternoon
until a potential surge in moisture/PWATs moves across the area
Thursday bringing chances for rain further inland.

&&

.AVIATION...
(18Z TAFS)
Issued at 1258 PM CDT Sun Sep 13 2026

Winds will remain rather breezy this afternoon out of the southeast.
A few gusts up and over 20 kts are possible. Opted to introduce
another PROB30 thunderstorms and gusty winds accompanying those
storms if they do impact terminals from 22-01Z. MVFR ceilings will
likely develop closer to 06Z as the trend from last night has shown
that low level moisture and clouds have been quicker to form than
LAMP and NBM guidance indicate.

&&

.PRELIMINARY POINT TEMPS/POPS...
Austin Camp Mabry              78 101  78 102 /  10  10   0   0
Austin Bergstrom Intl Airport  77 100  77 101 /  10  10   0   0
New Braunfels Muni Airport     75  99  75 100 /  20  10   0   0
Burnet Muni Airport            74  97  74  98 /  10  10   0   0
Del Rio Intl Airport           77 100  77 102 /   0   0   0   0
Georgetown Muni Airport        77 100  77 100 /  10  10   0   0
Hondo Muni Airport             75  99  75 100 /  10  10   0   0
San Marcos Muni Airport        76 100  75 101 /  20  10   0   0
La Grange - Fayette Regional   77  99  77 100 /  20  20  10  10
San Antonio Intl Airport       78  99  78 100 /  10  10   0   0
Stinson Muni Airport           78 101  77 102 /  10  10   0   0

&&

.EWX WATCHES/WARNINGS/ADVISORIES...
Heat Advisory until 7 PM CDT this evening for TXZ173-191>194-
205>209-220>225.

Heat Advisory from noon to 7 PM CDT Monday for TXZ173-191>194-
205>209-220>225.

&&

$$

SHORT TERM...27
LONG TERM....27
AVIATION...MMM