Marine Weather and Tide Forecast for Tierra Grande, TX

DISCUSSION
Issued at 133 AM CDT Thu Jun 18 2026

Main concern today will be the heat with a major risk of heat related impacts. Highs are expected to range from 104 along the Rio Grande to mid 90s along the coast. Dewpoints are progged to be in the mid 70s west to low 80s east this afternoon, leading to high humidity. The combination of the very humid conditions with the max temperatures will lead to dangerous heat indices of 115 to around 120 across S TX. An Extreme Heat Warning is in effect for S TX from noon to 8 pm. The barrier islands will be a tad cooler, but heat indices of 110-114 will still result in dangerous heat conditions.
Thus, a Heat Advisory is also in effect for the islands. Heat indices for Friday will be a tad cooler, but still ranging from 110- 114. A Heat Advisory will likely be needed for S TX Friday. Saturday will be slightly cooler due to an increase in rain chances.

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
(12Z TAFS)
Issued at 619 AM CDT Thu Jun 18 2026

MVFR to IFR VIS and CIG reductions this morning at ALI and VCT.
Other sites remain mainly VFR, though CRP has bounced in and out of an MVFR/IFR CIG at times. Conditions will improve by mid- morning and remain VFR through the rest of the day. Late in the evening or overnight low CIGS will begin to develop especially for eastern sites. Some potential for brief MVFR CIGS at LRD/COT, but confidence is lower and will not include in TAF yet.

MARINE
Issued at 133 AM 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 Advisories may be needed at times through the period.

FIRE WEATHER
Issued at 133 AM CDT Thu Jun 18 2026

Fire weather concerns will remain low through the period due to elevated relative humidity values and wet fuels. Rain chances are very low today through Friday, with low to medium chances by the weekend.

PRELIMINARY POINT TEMPS/POPS
Corpus Christi 95 82 92 82 / 0 0 0 0 Victoria 93 80 92 78 / 0 0 10 20 Laredo 104 81 99 79 / 0 0 10 40 Alice 99 79 94 79 / 0 0 10 10 Rockport 93 84 93 83 / 0 0 0 10 Cotulla 102 80 97 78 / 0 20 20 40 Kingsville 97 80 93 80 / 0 0 10 10 Navy Corpus 92 85 91 84 / 0 0 0 0

CRP WATCHES/WARNINGS/ADVISORIES
TX...Extreme Heat Warning from noon today to 8 PM CDT this evening for TXZ229>234-239>247-342>344-346-347.

Heat Advisory from noon today to 8 PM CDT this evening for TXZ345-442-443-447.

GM...Small Craft Advisory until 7 AM CDT this morning for GMZ270-275.