textproduct: Brownsville/Rio Grande Valley

KEY MESSAGES

Updated at 626 AM CDT Sun Aug 9 2026

- Sustained dry weather for the new work week.

- Daytime highs increasing each day, with a Moderate to Major Heat Risk. - Small Craft Should Exercise Caution to Small Craft Advisory more likely starting Wednesday.

- Moderate to High Risk of rip currents at local beaches due to increasing winds and building seas.

DISCUSSION

Issued at 1005 PM CDT Sat Aug 8 2026

The KBRO upper air sounding from this evening indicated a precipitable water value of 1.89 inches, with supported a smattering of convection earlier today across the BRO CWFA. A similar moisture content within the atmosphere will allow another round if isolated showers and thunderstorms for Sunday. Afterwards, and for the remainder of the forecast period, dry weather will prevail as available moisture decreases.

Temperature-wise, slightly cooler temperatures on Sunday, the result of convection with enhanced cloud cover, will quickly disappear for the new work week, with daily high temperatures inching 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.

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

(12Z TAFS) Issued at 626 AM CDT Sun Aug 9 2026

VFR conditions are forecast to continue this morning. There is a 30% chance for some isolated convection along the sea breeze this afternoon, which could result in brief MVFR to IFR ceilings and visibilities. Calm winds this morning are forecast to become southeasterly around 5-10 knots later this morning, shifting more easterly through the afternoon. Light and variable winds are forecast to return overnight.

MARINE

Issued at 1005 PM CDT Sat Aug 8 2026

The pressure gradient over the western Gulf of America is expected to 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.

PRELIMINARY POINT TEMPS/POPS

BROWNSVILLE 94 81 96 81 / 20 0 0 0 HARLINGEN 96 76 99 77 / 20 0 10 0 MCALLEN 100 80 102 80 / 20 0 0 0 RIO GRANDE CITY 100 78 102 78 / 10 0 0 0 SOUTH PADRE ISLAND 88 81 89 81 / 10 0 0 0 BAYVIEW/PORT ISABEL 93 79 95 79 / 20 0 0 0

BRO WATCHES/WARNINGS/ADVISORIES

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