textproduct: Corpus Christi

KEY MESSAGES

Issued at 612 AM CDT Tue Aug 18 2026

- Moderate to major risk of heat-related impacts through next week with peak afternoon heat indices around 110

- Monitoring daily elevated fire weather potential over the Brush Country through the week and into next week

DISCUSSION

Issued at 1246 AM CDT Tue Aug 18 2026

Little overall change is expected through the period as only subtle shifts occur in the center position of the mid-level high. South Texas will remain beneath the influence of the ridge with the center over the Desert SW, maintaining hot and predominately dry conditions. Very low rain chances will remain possible along the sea breeze each afternoon, though measurable rainfall is not anticipated. Toward the end of the forecast period, PVA rounding the periphery of the high may provide somewhat better support for convection and a slight increase in rain chances.

Temperatures will remain largely unchanged, with afternoon highs generally ranging from the 90s across the Coastal Bend to around 100- 105 degrees across the Brush Country and the Rio Grande Plains. Overnight lows will generally remain in the mid 70s to lower 80s. Peak heat indices of 105 to around 110 are expected each afternoon, maintaining moderate to major HeatRisk across much of South Texas. Pockets of extreme HeatRisk may develop across portions of the Brush Country this weekend. With little relief from the heat expected, continued heat safety precautions will be necessary throughout the period.

AVIATION

(12Z TAFS) Issued at 612 AM CDT Tue Aug 18 2026

So far have kept mainly VFR conditions for all sites, but seeing some notes of MVFR VIS developing, so will maintain tempo groups for all sites for the potential of fog/CIG issues as the sun comes up. Otherwise VFR conditions through the day and will lean toward mainly VFR conditions tonight at this time.

MARINE

Issued at 1246 AM CDT Tue Aug 18 2026

Persistent onshore flow will remain generally gentle to moderate (BF 3-4), with occasional fresh (BF-5) flow possible during the late afternoon and nighttime hours. Seas should remain relatively steady around 2-3 ft with no significant marine hazards anticipated. Rain chances will remain very low through the weekend, with a potential increase early next week.

FIRE WEATHER

Issued at 1246 AM CDT Tue Aug 18 2026

Elevated fire weather concerns will continue, particularly across the Brush Country, as hot and dry conditions persist. Minimum RH values will briefly fall into the mid 20s for several hours each afternoon across the Brush Country. ERC values remain within the 70th-89th percentile, while maximum RFTI values remain around 2. Although widespread critical fire weather conditions are not anticipated, the combination of low afternoon humidity, increasingly dry fuels, and hot temperatures will maintain an elevated fire weather risk through much of the period.

PRELIMINARY POINT TEMPS/POPS

Corpus Christi 96 77 97 79 / 0 0 0 0 Victoria 98 76 98 76 / 0 0 0 0 Laredo 103 78 104 79 / 0 0 0 0 Alice 101 74 101 76 / 0 0 0 0 Rockport 91 81 91 81 / 0 0 0 0 Cotulla 103 77 104 78 / 0 0 0 0 Kingsville 99 75 100 77 / 0 0 0 0 Navy Corpus 90 81 90 82 / 0 0 0 0

CRP WATCHES/WARNINGS/ADVISORIES

TX...None. GM...None.