textproduct: Austin/San Antonio

KEY MESSAGES

Updated at 1244 AM CDT Thu Jul 23 2026

- Major to moderate flooding will continue along the Nueces at and below Asherton through the remainder of the week.

- Heat Advisory now in effect for all of South-Central Texas today through 8 PM.

- Sheared Tropical Storm Bertha moving west over the northwestern Gulf with approach towards the middle to upper Texas coast later today into tonight.

- Scattered tropical downpours and a storm or two to favor mainly areas along and south of the I-10/Highway 90 corridor. Most rain with Bertha to remain farther to the south. Gusts up to 30 mph possible otherwise with Bertha across the region.

SHORT TERM

(Today through Friday) Issued at 1244 AM CDT Thu Jul 23 2026

A very warm night is forecast across the region after yesterday's very hot afternoon with overnight lows only bottoming out in the upper 70s and low 80s. Another hot day will be expected today but not quite as excessive as yesterday. A Heat Advisory will be in place for all of South-Central Texas, after the expansion this morning to the Rio Grande. Temperatures will range from the upper 90s into the 100 to 105 range with heat indices as high as 113 degrees. Skies trend mostly clear but clouds should begin to increase across our eastern and southeastern most zones into the late afternoon as Bertha's circulation approaches. More on Bertha can be found below.

Tropical Storm Bertha's circulation as of this writing is hugging the Louisiana coast. It has a sheared appearance with northerly shear impacting the storm, which is keeping majority of it's rain and convection well to the south of it's circulation. Bertha's circulation is expected to move back across the far northwestern Gulf waters with an approach towards the mid to upper Texas coast late today into tonight. It will continue to be impacted by the northerly shear through this timeframe. As a result of this appearance, models are in agreement to indicate that the best placement for the most rain with Bertha will be across the Corpus Christi and Brownsville WFO CWAS from this evening into early Friday. We could get a glancing chance of some spotty tropical downpours, perhaps a storm or two, for locations mainly along and south of the I-10 and US highway 90 corridor. Rainfall amounts within our region are quite meager, generally of around a quarter inch or less, and this keeps our concern for flooding after our recent events, very low.

While the rain from Bertha favors to the south of our region, its remnant circulation could push inland into our region. This will locally enhance the winds slightly with gusts up in the 25-35 mph range. Bertha's circulation weakens with time from tonight into early Friday and the flow should return towards the background levels by Friday morning. Friday's morning lows should not be as warm as what is expected this morning, but some locations will remain around that 80 degree mark. Friday afternoon should be slightly less hot compared to today as well with highs in the mid and upper 90s with heat indices mostly peaking in the 100 to 105 degree range.

LONG TERM

(Friday night through Wednesday) Issued at 1244 AM CDT Thu Jul 23 2026

Mid-level ridging remains the focal point of the weather pattern through the long term period with the typical late July heat, humidity, and the usual little to no rainfall for the region. The majority of the time, skies should trend partly cloudy to mostly sunny under a light to moderate south-southeasterly low-level flow coming off from the Gulf.

AVIATION

(06Z TAFS) Issued at 1244 AM CDT Thu Jul 23 2026

VFR conditions are forecast for the local airports through at least late this evening. Light northerly and variable winds are forecast to dominate the local area overnight through late Thursday morning. By Friday afternoon, northerly winds increase to 10 to 15 knots with gusts as high as 23 knots as the Tropical Storm Bertha approaches the east Texas coast. MVFR cigs are forecast for the I-35 terminals around 05Z to 06Z Friday.

PRELIMINARY POINT TEMPS/POPS

Austin Camp Mabry 101 80 97 77 / 0 20 10 0 Austin Bergstrom Intl Airport 100 79 96 77 / 0 20 10 0 New Braunfels Muni Airport 100 79 96 76 / 0 20 10 0 Burnet Muni Airport 98 78 94 74 / 0 10 0 0 Del Rio Intl Airport 106 79 96 78 / 0 0 10 0 Georgetown Muni Airport 99 80 95 77 / 0 10 10 0 Hondo Muni Airport 100 79 95 75 / 0 20 20 0 San Marcos Muni Airport 100 78 95 76 / 0 20 10 0 La Grange - Fayette Regional 99 79 97 77 / 0 30 10 0 San Antonio Intl Airport 100 80 95 77 / 0 20 10 0 Stinson Muni Airport 101 80 96 77 / 0 30 10 0

EWX WATCHES/WARNINGS/ADVISORIES

Heat Advisory until 8 PM CDT this evening for TXZ171>173-183>194- 202>209-217>225-228.