textproduct: Austin/San Antonio

KEY MESSAGES

- Dry and warm through next weekend.

- Elevated heat index values expected for the I-35 corridor, Coastal and Rio Grande Plains areas through next weekend.

SHORT TERM

(Tonight through Tuesday night) Issued at 1234 PM CDT Mon Jun 22 2026

The subtropical ridge is building back over Texas and will continue to do so through the short term period. The low level flow is from the southeast across South-Central Texas. The airmass over our CWA remains warm and moist with temperatures and dewpoints within a couple of degrees of where they were 24 hours ago. As the subtropical ridge strengthens over the next 24 hours the low level flow will continue from the southeast. The upper ridge will suppress any convection. Temperatures will be steady through the short term. Lows Tuesday and Wednesday will be about the same as this morning. Highs Tuesday will also be about the same as today. We expect some better vertical mixing of the boundary layer Tuesday bring lower dewpoints down to the surface which will keep the heat indices lower. For most of the area the heat index will stay below 105.

LONG TERM

(Wednesday through next Monday) Issued at 1234 PM CDT Mon Jun 22 2026

The subtropical ridge will continue to dominate over the region through the rest of the week. The low level flow will also continue from the southeast. There will be little change in the weather through the long term period. Temperatures will be fairly steady through the end of the work week and good mixing will keep heat indices below advisory criteria. The weekend will bring a couple of degrees of warming and some places in the Coastal Plains may reach Heat Advisory level.

AVIATION

(18Z TAFS) Issued at 1149 AM CDT Mon Jun 22 2026

Nearing the transition period of the terminals to shift from MVFR to VFR conditions for the start of the 18z TAF cycle. Anticipate to see KAUS to go VFR around the top of the hour with KSAT and KSSF following by 19z. KDRT is also on the edge of breaking out of MVFR ceilings, but think this will be closer to 1830Z. VFR and gust conditions will continue through the afternoon hours as mixing peaks before seeing gusts drop after sunset.

Another MVFR deck is anticipated to develop overnight for KAUS, KSAT, and KSSF after midnight and KDRT should see this deck develop around sunrise. Hi-res models hint at the possibility of KSAT and KSSF seeing a brief ceiling drop to IFR around daybreak as well, but confidence is a little low to include in prevailing with this issuance.

Towards the end of this TAF cycle, MVFR ceilings are anticipated to dissipate around the 16z to 18z window with some gusty south- easterly winds.

PRELIMINARY POINT TEMPS/POPS

Austin Camp Mabry 78 95 77 96 / 0 0 0 0 Austin Bergstrom Intl Airport 78 95 77 96 / 0 0 0 0 New Braunfels Muni Airport 76 94 75 94 / 0 0 0 0 Burnet Muni Airport 76 93 74 94 / 0 0 0 0 Del Rio Intl Airport 77 97 77 98 / 0 0 0 0 Georgetown Muni Airport 77 95 76 95 / 0 0 0 0 Hondo Muni Airport 75 92 74 92 / 0 0 0 0 San Marcos Muni Airport 77 95 76 95 / 0 0 0 0 La Grange - Fayette Regional 78 94 77 95 / 0 0 0 0 San Antonio Intl Airport 77 93 76 93 / 0 0 0 0 Stinson Muni Airport 77 93 76 93 / 0 0 0 0

EWX WATCHES/WARNINGS/ADVISORIES

None.