textproduct: Austin/San Antonio

KEY MESSAGES

- Temperatures will warm to well above normal Monday.

- Hot and humid weather will continue into the middle of the week with heat indices near or exceeding 100 degrees.

- Rain chances will return Wednesday and continue through Friday.

SHORT TERM

(Today through Tuesday) Issued at 126 AM CDT Mon Apr 27 2026

An upper level ridge extends from the western Gulf to the Great Lakes with a deep trough from central Canada to southern CA. The flow over TX is from the southwest. High pressure in the low levels has the flow from the southeast over South-Central Texas. The airmass over the region remains warm and moist with no significant change over the last 24 hours. Cloudy skies kept temperatures down Sunday afternoon, but model consensus is for decreasing cloudiness this afternoon leading to warmer temperatures. Highs will be in the 90s with a few spots in the southwest approaching 100. Humidity will remain uncomfortably high leading to heat indices reaching 100-105 over the I-35 Corridor, Rio Grande Plains, and Coastal Plains. There won't be any significant change in the pattern through the rest of the short term. Cloudy skies will develop tonight keeping overnight temperatures warm with lows mainly in the 70s Tuesday morning. Tuesday afternoon will be a virtual repeat of Monday with another hot, uncomfortable day. This heat this early in the season may be shocking, and we should all take precautions to avoid heat illness. Wear light colored, loose fitting clothes, take breaks if working outdoors, and stay hydrated.

LONG TERM

(Tuesday night through Sunday) Issued at 126 AM CDT Mon Apr 27 2026

Wednesday we should start to see some changes. A cold front will move through North Texas and into our CWA. Ahead of the front will be another hot, humid day, but the front should make enough progress to bring some relief to the northern I-35 Corridor and Hill Country. High should "only" be in the 80s across this area. The front will also bring the start of chances for showers and thunderstorms. Wednesday afternoon we'll see around a 20% chance for rain, and the chances will increase Wednesday and Thursday. The front will stall across our region and continue to provide a focus for convection through Friday. Currently models show the best timing to be Thursday night and daytime Friday. Given the forecast CAPE and PW, strong thunderstorms will be possible along with locally heavy rain. It's too early to get specific, but problematic weather looks possible. Cooler, more stable air will move in for next weekend. If models can be believed we could see highs in the 60s and 70s and lows in the 50s next weekend to start May.

AVIATION

(06Z TAFS) Issued at 1217 AM CDT Mon Apr 27 2026

Very little change to the previous forecast other than to tweak timing and wind speeds/directions. MVFR ceilings are expected through late morning, with a TEMPO group used at SAT and SSF for the possibility of IFR ceilings. VFR is expected by early afternoon at all sites Monday.

PRELIMINARY POINT TEMPS/POPS

Austin Camp Mabry 94 74 94 72 / 10 10 10 10 Austin Bergstrom Intl Airport 94 74 95 72 / 10 10 10 10 New Braunfels Muni Airport 94 73 94 72 / 10 10 10 10 Burnet Muni Airport 92 72 90 69 / 20 10 20 20 Del Rio Intl Airport 97 75 96 75 / 10 10 10 10 Georgetown Muni Airport 93 72 92 70 / 10 10 10 20 Hondo Muni Airport 94 72 96 71 / 10 10 10 10 San Marcos Muni Airport 94 73 95 72 / 10 10 10 10 La Grange - Fayette Regional 93 74 94 72 / 10 0 10 10 San Antonio Intl Airport 94 75 95 73 / 10 10 10 10 Stinson Muni Airport 95 75 96 73 / 10 10 10 10

EWX WATCHES/WARNINGS/ADVISORIES

None.