textproduct: Corpus Christi

KEY MESSAGES

Issued at 202 PM CDT Thu Aug 20 2026

- Prolonged above-average temperatures will maintain elevated potential for additional Heat Advisory issuance across South Texas.

- Fire weather potential will remain elevated each day across the Brush Country through the weekend and well into next week.

- Without adequate precautions, cumulative impacts of heat and heat stress will remain a significant risk factor to health for all communities (especially for heat-sensitive populations).

DISCUSSION

Issued at 117 PM CDT Thu Aug 20 2026

As of 1PM, water vapor satellite imagery depicts some mid-level moisture in place across South Texas, producing some inland cloud cover near Laredo and La Salle counties. A persistent ridge axis extending from the Intermountain West will maintain the risk of hazardous heat through the rest of the week and weekend. Subsident air under this ridge will also suppress just about any meaningful chances of rain (and isolated heat/drought relief) well into next week. Seabreeze convection remains as the primary source of convection (and any hope of rainfall) in this atmopheric regime, while probabilities of temperature maximums reaching and/or exceeding 100 degrees will also remain above 80 percent each day for inland zones/Brush Country west of US Hwy 77. Long-range guidance tries to suggest some light at the end of this tunnel as persistent ridging may be undercut by troughing that reaches the west Gulf Coast, but that low-end probability has yet to be fully resolved by future forecasts and outlooks.

With multiple days of above average heat (CRP average near 95) expected, cumulative heat stress remains a risk to health outdoors and precautions can be taken to reduce the risk of heat illness. These precautions include and are not limited to: reducing or changing time spent outdoors to cooler times of day, increasing time and access to air-conditioned spaces, checking on heat- sensitive populations, and checking the car seats of vehicles before departure for the day.

Cassel

AVIATION

(18Z TAFS) Issued at 117 PM CDT Thu Aug 20 2026

For the 20/18Z TAF update, VFR vis/cigs will prevail through the period once again with some MVFR vis exceptions at KVCT at 21/09Z-12Z. Winds will also retain a similar cycle with southeasterly surface flow near 10 kts in the morning gaining a more southerly direction through the afternoon at 10-15 kts before slackening in speed again overnight.

Cassel

MARINE

Issued at 137 AM CDT Thu Aug 20 2026

Light to moderate (BF 2-4) onshore breezes will continue through the period, with occasional fresh (BF 5) breezes possible during the late afternoon/evening hours. Seas are expected to remain around 2-3 feet. Rain chances will remain near zero.

FIRE WEATHER

Issued at 137 AM CDT Thu Aug 20 2026

The potential for elevated fire weather conditions over the Brush Country and portions of the western Coastal Plains are expected to continue into next week, with relative humidity values dropping into mid 20s each afternoon. With ERC values in the 75-89th percentile, low humidity, dry to critically dry fuels, and hot temperatures, a few locations across the Brush Country could see critical fire weather conditions today into next week.

PRELIMINARY POINT TEMPS/POPS

Corpus Christi 78 96 76 98 / 0 0 0 0 Victoria 76 103 74 102 / 0 0 0 0 Laredo 79 105 79 106 / 0 0 0 0 Alice 75 103 73 104 / 0 0 0 0 Rockport 81 93 80 93 / 0 0 0 0 Cotulla 78 106 78 105 / 0 0 0 0 Kingsville 76 100 75 102 / 0 0 0 0 Navy Corpus 81 91 80 92 / 0 0 0 0

CRP WATCHES/WARNINGS/ADVISORIES

TX...Heat Advisory until 7 PM CDT this evening for TXZ230>234-241>247- 342>344-346-347.

GM...None.