textproduct: Austin/San Antonio

KEY MESSAGES

Updated at 537 AM CDT Wed Aug 26 2026

- Heat Advisory continues until 7 PM this evening for the Coastal Plains, I-35 corridor, and portions of the Hill Country.

- Low to medium rain and storm chances for most areas Thursday and a some locations on Friday. Otherwise, hot and dry weather throughout the week.

UPDATE

Issued at 537 AM CDT Wed Aug 26 2026

Based on short term guidance and the current location of the disturbances moving around the sub-tropical ridge, have elected to insert a 15% mentionable PoP for late this afternoon through this evening for a region across Burnet/Llano Counties into Blanco County. Have also brought 10% PoPs into the I-35 corridor. Additionally, have added PoPs on Thursday morning even earlier than previously forecast, but do anticipate for highest chances to remain on Thursday afternoon with peak daytime heating. Lastly, there is some virga (sprinkles evaporating prior to reaching the ground) moving across portions of the Hill Country but don't expect for this activity to reach the ground.

SHORT TERM

(Today through Thursday) Issued at 1217 AM CDT Wed Aug 26 2026

Westward movement of the ridge will take place today positioning South Central Texas under more northerly or northwesterly flow aloft by the evening. This helps us only mildly in the temperature department as another hot day is still forecast with highs in the 100-105 degree range. The long-standing Heat Advisory will remain in effect through 7 PM tonight which includes the Coastal Plains, I-35 corridor and portions of the Hill Country. Additionally, late this afternoon and tonight still trend drier as most guidance indicates weakening or dissipating shower and storm activity as it approaches our northern CWA. The ridge just slightly shifts further west on Thursday bringing all of the area under the northwesterly flow. A few disturbances may develop and move south into the area with the highest rain chances beginning Thursday afternoon as a front slowly moves towards the area. Moisture and peak heating will likely allow for some shower and thunderstorm development near this feature, though we are not expecting widespread rain across the area. Any convection that does manage to develop will likely be high-based and would pose a gusty wind threat in any of the stronger cells. Due to rain chances and increased cloud cover Thursday, high temperatures should decrease a few degrees keeping us below Heat Advisory criteria. However, depending on where and when storms develop, some areas could still be close to the 103 mark for high temperatures or have heat index values approach 108 degrees due to increased humidity, so we will continue to monitor.

LONG TERM

(Thursday night through Tuesday) Issued at 1217 AM CDT Wed Aug 26 2026

Low to medium rain chances continue Thursday night into Friday with a boundary in the area. There may be lesser coverage in any showers or thunderstorms Friday due to the slight eastward progression of the mid-level ridge during the day. High temperatures relax slightly Friday into the weekend though the mid 90s to around 103 degrees will still be common each day depending on location. An increase in moisture will bump up heat index values, however, so there may be a need for additional heat products but confidence is low at this time. Weak ridging this weekend is interrupted by a disturbance moving towards the Gulf coast early next week. This could bring back some low rain chances to the area and keep highs below Heat Advisory levels.

AVIATION

(12Z TAFS) Issued at 537 AM CDT Wed Aug 26 2026

VFR flight conditions should continue to generally prevail. Have not seen much low cloud development quite yet but still have a chance for some formation after sunrise. Kept mention of FEW low clouds this morning within the TAFs. Otherwise, mostly clear to partly cloudy skies can be expected through this evening with occasional mid to high level clouds. Greater clouds and the chance for some showers could work into the region out of the north from late overnight into Thursday morning. This could even feature some showers, and perhaps a stray storm. Elected to add VCSH to KAUS beyond 05Z. Winds maintain around 10 kts or less from the south-southwest to east-southeast. Guidance is not bullish on gusts after sunset with the sea breeze for later this evening as compared to previous nights.

PRELIMINARY POINT TEMPS/POPS

Austin Camp Mabry 104 79 102 77 / 10 10 30 30 Austin Bergstrom Intl Airport 103 78 102 76 / 10 10 40 40 New Braunfels Muni Airport 103 77 101 75 / 10 10 40 40 Burnet Muni Airport 101 77 99 74 / 10 20 40 30 Del Rio Intl Airport 104 79 102 78 / 0 10 10 20 Georgetown Muni Airport 103 78 101 76 / 10 20 30 30 Hondo Muni Airport 102 76 100 74 / 0 10 40 40 San Marcos Muni Airport 102 77 101 75 / 10 10 40 40 La Grange - Fayette Regional 104 78 101 77 / 10 10 40 40 San Antonio Intl Airport 103 78 100 78 / 10 10 30 40 Stinson Muni Airport 104 78 102 78 / 0 10 30 40

EWX WATCHES/WARNINGS/ADVISORIES

Heat Advisory until 7 PM CDT this evening for TXZ171>173-191>194- 205>209-220>225.