textproduct: Brownsville/Rio Grande Valley

KEY MESSAGES

Updated at 1250 AM CDT Tue Aug 11 2026

- Unseasonably hot high temperatures through the forecast.

- Dry weather, with isolated convection possible on Friday.

- Slightly adverse winds Wednesday through Friday for mariners.

- Elevated risk of rip currents for the second half of the week.

DISCUSSION

Issued at 1004 PM CDT Mon Aug 10 2026

Deep South Texas and the Rio Grande Valley will be positioned on the western periphery of 500 mb high pressure that will remain centered roughly over Louisiana during the forecast period. This will produce dry weather for a majority of the next several days. However, a slight chance of isolated convection exists for Friday, as an inverted mid-level trough sneaks under the 500 mb high and moves into extreme northeast Mexico.

Temperature-wise, daily high temperatures will inch up a degree or two each successive day into well above normal levels. This will cause a Moderate to Major Heat Risk across Deep South Texas and the Rio Grande Valley to become Major to Extreme as the week progresses, eventually easing for the weekend back into Moderate to Major territory.

Finally, with a gradually tightening pressure gradient along the Lower Texas Coast expected, a Moderate to High Risk of rip currents at the local beaches will likely occur daily.

AVIATION

(06Z TAFS) Issued at 1250 AM CDT Tue Aug 11 2026

Light southeast winds with a few low clouds prevail across Deep South Texas early this morning. Light winds will continue overnight becoming moderate to breezy later this morning into the afternoon. VFR conditions are expected for the next 24 hours.

MARINE

Issued at 1004 PM CDT Mon Aug 10 2026

It continues to be expected that the pressure gradient over the western Gulf of America will become enhanced during the forecast period. Light to moderate winds and low to moderate seas initially will become moderate to breezy winds and moderate to slightly adverse seas beginning around the middle of the week. Small Craft Should Exercise Caution and possibly Small Craft Advisory will be needed Wednesday through Friday to account for the anticipated stronger winds and higher seas. Marine conditions should then improve for the weekend.

PRELIMINARY POINT TEMPS/POPS

BROWNSVILLE 96 81 97 82 / 10 0 0 0 HARLINGEN 99 77 101 78 / 0 0 0 0 MCALLEN 102 81 104 81 / 0 0 0 0 RIO GRANDE CITY 103 79 104 78 / 0 0 0 0 SOUTH PADRE ISLAND 89 81 90 82 / 0 0 0 0 BAYVIEW/PORT ISABEL 96 80 97 80 / 0 0 0 0

BRO WATCHES/WARNINGS/ADVISORIES

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