064
FXUS64 KEWX 181300 AAA
AFDEWX

Area Forecast Discussion...UPDATED
National Weather Service Austin/San Antonio TX
800 AM CDT Fri Sep 18 2026

...New UPDATE...

.KEY MESSAGES...
Updated at 742 AM CDT Fri Sep 18 2026

- Low rain chances today for the coastal plains, portions of the
  I-35 corridor and Rio Grande plains.

- Above average temperatures continue through the weekend and next
  week.

&&

.UPDATE...
Issued at 742 AM CDT Fri Sep 18 2026

Isolated showers and storms over the coastal plains continue to
move northwestward into portions of the I-35/I-37 corridor this
morning. Higher moisture levels from this region westward into
portions of the Rio Grande plains is where rainfall chances will
be favored today. We have updated the forecast to boost rain
chances, mainly over the coastal plains region.

&&

.SHORT TERM...
(Today through Saturday)
Issued at 1221 AM CDT Fri Sep 18 2026

A weak perturbation at the southwest portion of the ridging
dominating most of the nation`s center and mid Atlantic areas, is
generating scattered to broken clouds over the coastal plains, I-35
corridor, and Hill Country early this morning. Area Doppler radars
are showing very little echos in the way of precipitation with trend
continuing for most of the day on Friday. The exception of this is
part of the Coastal Plains and Rio Grande where a few showers or a
storm is possible. Highs will be in the lower to upper 90s and up to
101. Maximum heat index values to range from 100 to 107 across the
Hill Country, I-35 corridor, and coastal plains. By mid to late
afternoon, a dry airmass pushes from the east and spread across the
local area and limiting rain chances.

By Saturday, the upper level high sits across northeast Texas and
keeps a rain-free period across the local area.

&&

.LONG TERM...
(Saturday night through Thursday)
Issued at 1221 AM CDT Fri Sep 18 2026

Little changes to the weather pattern for Sunday across South
Central Texas. However, the upper level ridge weakens and brings sea
breeze convective activity along the coast in addition to an upper
level trough moving across the southern Edwards Plateau. By Tuesday,
the upper level high takes control and back to dry for the most
parts. Dry weather conditions are forecast mid to late week.

&&

.AVIATION...
(12Z TAFS)
Issued at 524 AM CDT Fri Sep 18 2026

Very few changes to the previous forecast as things remain on
track. MVFR ceilings are expected at DRT shortly with SAT and SSF
possibly following suite between 12-15Z. Otherwise, expected VFR
ceilings and east-southeasterly surface winds of 5-10 kts.

&&

.PRELIMINARY POINT TEMPS/POPS...
Austin Camp Mabry              99  73  99  74 /   0   0   0   0
Austin Bergstrom Intl Airport  99  73  99  74 /   0   0   0   0
New Braunfels Muni Airport     98  72  97  72 /  10   0   0   0
Burnet Muni Airport            96  71  95  71 /   0   0   0   0
Del Rio Intl Airport           97  77  99  76 /  10   0  10   0
Georgetown Muni Airport        98  73  98  74 /   0   0   0   0
Hondo Muni Airport             96  73  97  72 /  20   0   0   0
San Marcos Muni Airport        99  72  98  72 /   0   0   0   0
La Grange - Fayette Regional   97  71  97  72 /   0   0   0   0
San Antonio Intl Airport       97  75  97  75 /  20   0   0   0
Stinson Muni Airport           98  74  98  74 /  20  10   0   0

&&

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

$$

SHORT TERM...Platt
LONG TERM....Platt
AVIATION...Platt