textproduct: Austin/San Antonio

KEY MESSAGES

- Hot and humid weather this weekend into early next week with heat indices near or exceeding 100F.

- Low chances (10-20 percent) for isolated severe storms late Friday afternoon and evening and again Saturday afternoon and evening.

SHORT TERM

(Today through Saturday) Issued at 1256 AM CDT Fri Apr 24 2026

The nighttime microphysics satellite images are showing low clouds increasing and expanding across South Central Texas. These low clouds are forecast to stay for most of the morning period with clearing starting along the Rio Grande mid to late morning. By the way, there may be a time window around the morning commute for patchy and even isolated areas of fog along the escarpment and southern Edwards Plateau if light winds dominate. Today's highs are forecast to range from the upper 80s to low 90s. It is going to be dry for the most part, however, there is a slight chance (20 percent probability) for a few storms to develop if the cap breaks. If that happens, then the storms are likely to become strong to marginally severe as they take advantage of the instability around the local area. Main severe hazards will be large hail and damaging wind gusts if storms manage to develop.

Clouds return Friday evening and spread across South Central Texas during the overnight hours into Saturday morning. Clouds begin to clear out along the Rio Grande mid to late morning. Partly cloudy skies are forecast for most areas Saturday afternoon. With an active dry-line that sits over central Texas into the Rio Grande, a hot and moist airmass dominates the local area to bring highs into the 90s. Also, this scenario brings the probabilities of storms developing over parts of the Hill Country into the Rio Grande Plains if the cap breaks. So, once again, if any storm develops, then it has the capability to become strong to marginally severe as it uses the plenty of instability there is around the local area. Main severe hazards will be large hail and damaging wind gusts. Dew point temperatures are forecast to range from the mid 60s to low 70s and this translate to heat index values in the mid to upper 90s and even up to 103 across the southern part of the Rio Grande. With that said, we urge people to stay hydrated and limit outside activities during the afternoon period (peak heating).

LONG TERM

(Saturday night through Thursday) Issued at 1256 AM CDT Fri Apr 24 2026

The warming trend continues on Sunday into the middle of next week. Once again, those heat index values are forecast to be elevated on Sunday through at least Tuesday afternoon with heat index values in the mid to upper 90s and up to 103 and 104 along the southern part of the Rio Grande. Chances for rain may come back Monday afternoon as the dry-line pushes into the southern Edwards Plateau, but confidence is low and therefore, no PoPs. For Tuesday, the dry-line stays over the Val Verde County while a frontal boundary pushes into the Hill Country. This combination brings showers and storms over the Hill Country and areas along the I-35 Corridor. The dry-line acts as a trigger mechanism for storm development with storms possible along the Rio Grande on Wednesday and again on Thursday.

AVIATION

(12Z TAFS) Issued at 541 AM CDT Fri Apr 24 2026

Few changes to the going forecast. IFR/MVFR ceilings will persist through late morning or early afternoon before lifting to VFR. Opted to add in MVFR ceilings for tomorrow night as well as confidence is rather high. Continued with VCSH to highlight the chane of rain today.

PRELIMINARY POINT TEMPS/POPS

Austin Camp Mabry 89 70 91 70 / 20 10 10 0 Austin Bergstrom Intl Airport 88 70 91 70 / 20 10 0 0 New Braunfels Muni Airport 87 69 91 69 / 20 10 10 0 Burnet Muni Airport 89 69 89 69 / 20 0 20 10 Del Rio Intl Airport 93 70 96 72 / 0 0 10 0 Georgetown Muni Airport 89 69 90 70 / 20 10 10 10 Hondo Muni Airport 86 67 92 68 / 10 0 20 10 San Marcos Muni Airport 87 70 91 70 / 20 10 0 0 La Grange - Fayette Regional 87 71 90 71 / 20 10 0 0 San Antonio Intl Airport 87 70 91 70 / 20 10 10 10 Stinson Muni Airport 87 71 92 70 / 20 10 10 0

EWX WATCHES/WARNINGS/ADVISORIES

None.