textproduct: Austin/San Antonio

KEY MESSAGES

Updated at 1214 AM CDT Wed Jul 22 2026

- Major to moderate flooding will continue on the Nueces through the remainder of the week while the remainder of the rivers will continue to improve.

- Heat Advisory goes into effect on Wednesday for areas generally along and east of the I-35 corridor.

- We will continue to watch Tropical Storm Bertha as it moves through the Gulf for any impacts it could have on our region.

SHORT TERM

(Today through Thursday) Issued at 1214 AM CDT Wed Jul 22 2026

As mentioned in previous discussions, today will easily be the hottest day of the week, with afternoon temperatures climbing into upper 90s to lower 100s across the region. The hottest of these temperatures will be felt across the Rio Grande Plains and areas along and east of the I-35 corridor. With some higher moisture amounts across the area today, and winds expected to be a little lighter, which will reduce the amount of afternoon mixing, a Heat Advisory has been issued for Wednesday afternoon. Temperatures in these areas will range from the 100 to 104 degree range, and heat index values will reach up to around 114 degrees. While the remainder of the area will still be hot, they should remain below our Heat Advisory criteria for today anyways. In general, dry conditions are forecast for today, however, a few convective outflows from a near stationary front over north Texas could get into our northern part of the Hill Country and over portions along and east of Highway 77. Therefore, added a 10 percent chance of rain over those areas. If storms develop and make it, can't rule out heavy downpours and strong wind gusts.

Thursday will be more borderline in terms of reaching Heat Advisory criteria as afternoon highs will be slightly lower than today, but heat index values will still climb towards the 108 degree threshold. The entire area will remain dry for today, and while most of the area will be dry on Thursday, we will start to see some precipitation chances return for the Coastal Plains by Thursday afternoon in association with Tropical Storm Bertha. Still some uncertainty on how much of a direct impact this storm will have across our area.

LONG TERM

(Thursday night through Tuesday) Issued at 1214 AM CDT Wed Jul 22 2026

Rain chances increase some heading into Thursday night, mainly for areas east of I-35 and south of I-10 with only some very low end chances lingering into Friday. Things will generally dry out for the rest of the coming weekend and into the start of next week. In addition, the actual path that Tropical Storm Bertha decided to take could impact the weather for Friday and into the weekend, which we will continue to monitor. Right now models continue to limit how much precipitation we will see across our area. Post Bertha, temperatures will remain hot, and slowly increase with 100 degree temperatures filtering back into the area by the middle of next week.

AVIATION

(06Z TAFS) Issued at 1214 AM CDT Wed Jul 22 2026

VFR conditions are forecast to prevail through this TAF period. Winds will be light and variable tonight, increasing to around 6-8 knots Wednesday afternoon. Chances for MVFR vis/cigs are low Wednesday morning, generally less than 10 percent for all area sites. However, some patchy fog can't be ruled out across the Coastal Plains.

PRELIMINARY POINT TEMPS/POPS

Austin Camp Mabry 103 84 100 81 / 0 10 0 0 Austin Bergstrom Intl Airport 102 84 99 81 / 0 10 0 0 New Braunfels Muni Airport 102 83 100 80 / 0 0 0 0 Burnet Muni Airport 102 81 98 78 / 0 10 0 0 Del Rio Intl Airport 99 78 100 78 / 0 0 0 0 Georgetown Muni Airport 102 82 99 80 / 10 10 0 0 Hondo Muni Airport 99 81 99 79 / 0 0 0 10 San Marcos Muni Airport 102 83 99 79 / 0 0 0 10 La Grange - Fayette Regional 104 83 100 80 / 0 10 0 30 San Antonio Intl Airport 101 84 99 81 / 0 0 0 10 Stinson Muni Airport 101 84 100 81 / 0 0 0 20

EWX WATCHES/WARNINGS/ADVISORIES

Heat Advisory from noon today to 8 PM CDT this evening for TXZ171>173-191>194-204>209-219>225.