textproduct: Brownsville/Rio Grande Valley

DISCUSSION

Issued at 1229 PM CDT Tue Sep 8 2026

Upper-level ridging will dominate the Southern Plains through at least early next week, which will continue keeping conditions unseasonably hot and mostly rain-free throughout Deep South Texas. Record-breaking temperatures and Major (level 3 of 4) to Extreme (level 4 of 4) Heat Risk is expected to persist through the weekend into next week. A Heat Advisory is in effect this afternoon for the Coastal Counties along with Hidalgo and Starr Counties for heat indices that could reach up to 113 degrees. Other areas could see heat indices between 108-111 degrees today as well. Additional Heat Advisories may be needed subsequent days this week as well.

An influx of surface Gulf moisture will continue supporting low (20- 30%) daily chances for sea breeze convection each afternoon, primarily for areas east of I-69C. These chances are expected to continue through Thursday, diminish Friday and Saturday, and resume again on Sunday into next week.

AVIATION

(18Z TAFS) Issued at 1229 PM CDT Tue Sep 8 2026

VFR conditions expected at all airports with few clouds. There could be a shower or two but confidence was not high enough to include in the TAF package. Winds could become gusty this afternoon.

MARINE

Issued at 1229 PM CDT Tue Sep 8 2026

Favorable conditions are expected over the next several days with light to moderate southeasterly winds and low (1-3 feet) wave heights. Winds are expected to increase this weekend due to a slightly tightening pressure gradient, and SCEC conditions may become possible on the Laguna Madre in the afternoons.

PRELIMINARY POINT TEMPS/POPS

BROWNSVILLE 80 96 80 98 / 10 30 0 20 HARLINGEN 76 100 76 102 / 0 30 0 10 MCALLEN 81 102 80 104 / 0 30 10 0 RIO GRANDE CITY 79 103 79 104 / 10 10 10 0 SOUTH PADRE ISLAND 82 89 81 90 / 10 10 0 10 BAYVIEW/PORT ISABEL 79 95 78 96 / 0 20 0 20

BRO WATCHES/WARNINGS/ADVISORIES

TX...Heat Advisory until 6 PM CDT this evening for TXZ251>255-353.

GM...None.