textproduct: Corpus Christi

KEY MESSAGES

Issued at 547 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 atmospheric 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

(00Z TAFS) Issued at 547 PM CDT Thu Aug 20 2026

VFR conditions will continue, with a brief period of MVFR visibility possible for VCT from 09Z-13Z. Generally southeast winds will weaken overnight, then gusts to around 20 knots return Friday afternoon.

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.

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.