textproduct: Corpus Christi

KEY MESSAGES

Updated at 642 PM CDT Thu Jun 18 2026

- Extreme Heat Warning in effect for South Texas and a Heat Advisory in effect for the Barrier Islands today until 8 PM.

- Heat Advisory Friday areawide.

- Moderate Rip Current Risk and minor coastal flooding possible Friday.

- Small Craft Advisory in effect for the south nearshores initially, then including the offshore this evening.

DISCUSSION

Issued at 210 PM CDT Thu Jun 18 2026

The egregious temperatures will be the main story today with major heat related impacts once again. We already have a few areas such as Alice that is reporting a heat index value of 120 degrees. Expect highs to range from 104 to 90 across the area with heat indices around 115-120 across the area due to high dew points. Heat indices will be a little lower tomorrow with highs trending more into the 90s across South Texas. This will be thanks to increasing cloud cover with a low to medium chance for showers and thunderstorms Friday afternoon/evening. A Heat Advisory was issued for the entire region tomorrow with heat indices expected to be around 110-115. Will monitor for the need for an upgrade though as of right now confidence is low on that possibility. Saturday looks to be our "break" if you want to call it that where we won't see as high of heat indices, though they will still range around 105-110. Heat increases once again thereafter which will likely necessitate heat related products once again. Therefore, continue to check back for future updates. Regardless the practice of heat safety is strongly encouraged. Take frequent breaks and remember to stay hydrated, check those backseats, and avoid long exposure in these temperatures. For more information be sure to check out weather.gov/heatsafety.

Upper level ridging today will keep rain chances <5%, but by tonight, as mid level high pressure strengthens across the gulf, a weakness develops aloft over east and south TX. This will bring a low (10-20%) chance of showers and thunderstorms across the Rio Grande Plains by early Friday morning. Rain chances increase to 20- 45% Friday night across the Rio Grande Plains and Brush Country. The best chance of showers and thunderstorms is Saturday across S TX due to a strengthening mid level trough and deepening moisture. PWATs are progged to increase up to 2.3 inches. The combination of deep moisture and troughing aloft will lead to a more active sea breeze Saturday afternoon. Rain chances taper off Sunday as mid level high pressure over the gulf nudges westward and brings drier mid levels across S TX. Rain chances will be low to very low through early next week, but can not rule out a few showers along the sea breeze each afternoon.

The rip current risk will be low today and tonight, but swell periods are forecast to increase to around 8 seconds by Friday leading to a moderate rip current risk. Minor Coastal Flooding is not anticipated today but will be possible Friday during high tide. Main factor keeping tides from overflowing on Friday will be the wind direction of S-SE over the gulf waters. A more easterly component combined with the 8 sec swell periods would be more likely to push the water up to the dunes. Will continue to monitor trends for possible minor coastal flooding.

AVIATION

(00Z TAFS) Issued at 642 PM CDT Thu Jun 18 2026

VFR to MVFR conditions will be expected across the region overnight into Friday morning. CIGs will drop to MVFR levels levels this evening, IFR possible from ALI to VCT towards the early morning hours. Conditions will improve into the mid morning hours. Winds are expected to be out of the southeast around 10-15kt with gusts up to 20-25 kts. Rain chances will be increasing Friday evening for the Rio Grande plains.

MARINE

Issued at 210 PM CDT Thu Jun 18 2026

Moderate to fresh (BF 4-5) south to southeast winds can be expected today into early next week. Winds could be occasionally be strong (BF 6) across the southern Bays and Nearshore waters at times, particularly in the late afternoon. Small Craft Advisory will be in effect this afternoon through this evening for the southern nearshore waters. This evening all of the offshore waters will be added into the advisory through 12Z Friday morning. This will be for winds around 20 to 25 knots with wave heights around 6 to 7 feet.

PRELIMINARY POINT TEMPS/POPS

Corpus Christi 82 92 82 90 / 0 0 10 30 Victoria 79 92 79 91 / 0 10 30 30 Laredo 81 99 78 95 / 0 20 50 30 Alice 79 94 79 91 / 0 10 10 40 Rockport 84 92 83 91 / 0 0 20 20 Cotulla 80 97 78 95 / 20 30 50 30 Kingsville 80 93 80 90 / 0 10 10 30 Navy Corpus 84 91 84 90 / 0 0 20 20

CRP WATCHES/WARNINGS/ADVISORIES

TX...Extreme Heat Warning until 8 PM CDT this evening for TXZ229>234- 239>247-342>344-346-347.

Heat Advisory from 11 AM to 8 PM CDT Friday for TXZ229>234- 239>247-342>347-442-443-447.

Heat Advisory until 8 PM CDT this evening for TXZ345-442-443-447.

GM...Small Craft Advisory until 7 AM CDT Friday for GMZ231-232-236- 237-250-255.

Small Craft Advisory until 7 AM CDT Friday for GMZ270-275.