textproduct: Austin/San Antonio

KEY MESSAGES

- Extreme Heat Warning and Heat Advisory for Thursday.

- Hot and humid for the rest of the work week.

- Next chance for rain will be Friday night and Saturday.

SHORT TERM

(Today through Thursday) Issued at 142 AM CDT Wed Jun 17 2026

The main focus for the short term will be Potential Tropical Cyclone. However, since it will be moving away from South-Central Texas it will have minimal effect on us. There is only about a 20% chance for showers or thunderstorms over Lavaca County today. The rest of the area will be dry as most of the convection with the system will be farther east. Any tropical showers in the east could produce heavy rain. The bigger concern for our CWA will rising heat and humidity. Today heat indices will rise above 100 everywhere except the Hill Country and Southern Edwards Plateau. Thursday will be even hotter with heat indices above 110 for most of the area. We have issued an Excessive Heat Warning for the I-35 Corridor, Coastal Plains, and southern Rio Grande Plains and a Heat Advisory everywhere else.

LONG TERM

(Thursday night through Tuesday) Issued at 142 AM CDT Wed Jun 17 2026

Friday winds will shift to a little more easterly direction and temperatures and dewpoints will be a little lower. The resulting heat indices will also be lower. A Heat Advisory may be needed for I- 35 and the Coastal Plains, but the rest of the CWA should be below criteria. Another weak frontal boundary will move into Central Texas and stall there. At the same time deeper layer moist air will surge from the Gulf over our CWA. This combination will result in an increased chance for showers and thunderstorms Friday night and Saturday. PW will be high that locally heavy rain will be possible. The subtropical ridge will build back over TX Sunday into Monday bringing back dry weather. Temperatures will warm to near normal for the last few days of this forecast.

AVIATION

(12Z TAFS) Issued at 544 AM CDT Wed Jun 17 2026

MVFR ceilings were a bit slower to form this morning, but have taken hold at AUS, SAT, and SSF terminals. Current thinking is with winds fairly light and variable, IFR ceilings will develop in the next hour or so and remain in place through mid to late morning before southeasterly winds increase slightly to 5-10 kts. VFR should take over at that point as low clouds and stratus mix out fairly quickly. VFR remains through most of the remainder of the forecast period with the exception being some MVFR sneaking back into the picture by 09Z tomorrow morning at the I-35 sites.

PRELIMINARY POINT TEMPS/POPS

Austin Camp Mabry 92 78 97 80 / 0 0 0 10 Austin Bergstrom Intl Airport 92 78 97 80 / 0 0 0 0 New Braunfels Muni Airport 91 77 96 79 / 0 0 0 0 Burnet Muni Airport 93 77 97 78 / 0 0 0 10 Del Rio Intl Airport 99 78 105 81 / 0 0 0 30 Georgetown Muni Airport 92 77 97 79 / 0 0 0 10 Hondo Muni Airport 93 77 97 79 / 0 0 0 10 San Marcos Muni Airport 92 77 97 79 / 0 0 0 0 La Grange - Fayette Regional 91 78 96 81 / 10 0 0 0 San Antonio Intl Airport 93 77 97 80 / 0 0 0 10 Stinson Muni Airport 92 78 97 79 / 0 0 0 0

EWX WATCHES/WARNINGS/ADVISORIES

Heat Advisory from noon to 8 PM CDT Thursday for TXZ171-172- 183>190-202.

Extreme Heat Warning from noon to 8 PM CDT Thursday for TXZ173- 191>194-203>209-217>225-228.