textproduct: Brownsville/Rio Grande Valley

KEY MESSAGES

Updated at 1009 PM CDT Sun Aug 9 2026

- Sustained dry weather for the new work week.

- Daytime highs increasing each day, with a Moderate to Extreme 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 1009 PM CDT Sun Aug 9 2026

The KBRO upper air sounding from this evening indicated a precipitable water value of 2.08 inches, which supported an even more robust smattering of convection earlier today across the BRO CWFA. Unfortunately, a rapidly-waning moisture content within the atmosphere will prevent additional showers and thunderstorms for Monday and for the remainder of the forecast period, with dry weather prevailing.

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.

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

(00Z TAFS) Issued at 552 PM CDT Sun Aug 9 2026

VFR will prevail at the aerodromes through the next 24 hours. Diminishing winds overnight tonight will become moderate to breezy on Monday. Model guidance suggests that isolated convection may affect the aerodromes just prior to sunrise Monday morning, and the next issuance of TAFs may need to reflect this if the HRRR model becomes more consistent regarding timing and placement of streamer SHRA.

MARINE

Issued at 1009 PM CDT Sun Aug 9 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 Thursday night to account for the anticipated stronger winds and higher seas. Marine conditions should then improve for the end of the work week.

PRELIMINARY POINT TEMPS/POPS

BROWNSVILLE 94 80 96 81 / 30 10 10 0 HARLINGEN 96 76 98 77 / 40 10 10 0 MCALLEN 100 80 101 80 / 30 20 0 0 RIO GRANDE CITY 100 78 101 78 / 20 10 0 0 SOUTH PADRE ISLAND 88 81 89 81 / 30 10 10 0 BAYVIEW/PORT ISABEL 93 79 95 79 / 30 10 10 0

BRO WATCHES/WARNINGS/ADVISORIES

None.