textproduct: Brownsville/Rio Grande Valley

KEY MESSAGES

Updated at 1240 AM CDT Tue Jun 23 2026 - A moderate heat risk (level 2 of 4) and heat indices of 105-110 F on Tuesday reduce to minor (level 1 of 4) to moderate with indices of 100-108 F Wednesday and Thursday before increasing back to 105-110 F with moderate heat risks over the weekend.

- Seasonably hot temperatures and dry conditions are expected.

- There is a medium risk of life-threatening rip currents through Tuesday afternoon.

- Adverse marine conditions continue a Small Craft Advisory until 1 AM Tuesday, followed by improving conditions.

DISCUSSION

Issued at 1026 PM CDT Mon Jun 22 2026

Another breezy day is expected on Tuesday, with southeasterly winds gusting to around 25-30+ mph, maintaining moisture advection off the Gulf, leading to a moderate heat risk and heat indices of 105-110 F. Meanwhile, high pressure aloft, centered over the Desert Southwest and northern mexico, maximizes and stretches further east across the Plains Wednesday into Thursday, weakening southeasterly onshore flow, gusting to 20-25 mph; somewhat drier relative humidity limits heat indices to 100-108 F with moderate heat risks across the Lower/Middle RGV and minor elsewhere Wednesday and Thursday. High pressure aloft diminishes considerably over the weekend, rising heat indices to 105-110 F and elevating heat risks to medium by Friday as breezier southeasterly winds rebuild low-level moisture content. Temperatures remain average for this time of year, maximizing in the upper 90s across the Upper RGV and Rio Grande Plains while rising to the mid 90s elsewhere and minimizing in the upper 70s inland and lower 80s near the coast overnight. Dry conditons continue.

There is a medium risk of life-threatening rip currents through Tuesday afternoon.

AVIATION

(06Z TAFS) Issued at 1240 AM CDT Tue Jun 23 2026

Light southeast winds and a mix of VFR/MVFR ceilings prevail across Deep South Texas early this morning. Some periods of MVFR ceilings will be likely overnight, especially at BRO/HRL. Otherwise, VFR conditions are forecast for the next 24 hours. Southeast winds are forecast to increase and become moderate to gusty later this morning. Some gusts near 25 knots will be possible in the afternoon. MVFR ceilings may return late in the period.

MARINE

Issued at 1026 PM CDT Mon Jun 22 2026

Fresh to strong south-southeasterly winds maintain a Small Craft Advisory (SCA) across the Laguna Madre and Gulf waters (0-60 nm offshore) until 1 AM Tuesday. Meanwhile, the pressure gradient begins to loosen late tonight, likely transitioning to Small Craft Exercise Cautions (SCEC) headlines into at least Tuesday morning. Mostly moderate southeasterly winds and moderate (3-5 ft) seas resume by Tuesday afternoon or evening. A tightening pressure gradient returns over the weekend, with moderate to fresh, or even strong, southeasterly winds buildings seas; SCEC is likely, perhaps SCA as well.

PRELIMINARY POINT TEMPS/POPS

BROWNSVILLE 94 80 93 80 / 0 0 0 0 HARLINGEN 94 76 94 76 / 0 0 0 0 MCALLEN 95 78 95 78 / 0 0 0 0 RIO GRANDE CITY 96 77 97 76 / 0 0 0 0 SOUTH PADRE ISLAND 88 81 87 82 / 0 0 0 0 BAYVIEW/PORT ISABEL 91 79 91 79 / 0 0 0 0

BRO WATCHES/WARNINGS/ADVISORIES

TX...None. GM...Small Craft Advisory until 1 AM CDT early this morning for GMZ130-132-135-150-155-170-175.