textproduct: Brownsville/Rio Grande Valley

KEY MESSAGES

Updated at 611 PM CDT Wed Oct 7 2026

- Medium to high (40-80%) chances of rain continue along/east of I-69C this afternoon/evening, before falling to around low to medium (20-40%) through the end of the week.

- Increasing concern for hazardous beach and marine conditions late this week and into the weekend as Tropical Storm Isaias moves towards the northern Gulf coast. Coastal flooding and moderate to high risk of rip currents are likely along the lower Texas beaches.

- Mostly minor risks of heat-related illnesses (level 1/4) become moderate (level 2/4) by next Monday as deep low-level moisture returns.

DISCUSSION

Issued at 145 PM CDT Wed Oct 7 2026

Unsettled weather will continue across the Lower RGV and immediate coast through the end of the week as the region remains beneath persistent northeasterly flow. Additional rounds of light to moderate showers, and perhaps an isolated thunderstorm or two, will continue through at least tomorrow. High res guidance continues to highlight a low probability of isolated amounts upwards of 2-3 inches where heavier showers train across portions of Cameron, Willacy, and Kenedy counties. Given antecedent conditions, locally heavy rainfall may result in minor flooding issues, primarily across low-lying and poor drainage areas. Meanwhile, weak mid level ridging will promote general rain-free and warm conditions across the rest of Deep South Texas.

Precipitation chances should begin to taper off by Friday, with most activity remaining mostly over the Gulf waters, and southern Cameron County. Generally rain-free conditions and seasonably warm temperatures in the low to mid 90s are expected this weekend and into next week. An isolated sea breeze shower or thunderstorm cannot be ruled out early next week, but chances are fairly low (10% or less).

Tropical Storm Isaias will continue to strengthen and track towards the northern Gulf coast late this week and into the weekend, and while no direct impacts are expected across Deep South Texas, hazardous beach/marine conditions are likely. Coastal flooding and a moderate to high risk of rip currents is the primary concern as seas increase upwards of 5-7 feet late this week and weekend. Persistent northeasterly flow and increasing swell will likely result in waters to push into the dunes, especially along narrow beaches.

AVIATION

(00Z TAFS) Issued at 611 PM CDT Wed Oct 7 2026

VFR conditions are generally expected to prevail through the TAF period with periodic tropical rain bands with MVFR to briefly IFR ceilings at BRO to potentially HRL, mainly this evening. Northeasterly winds, occasionally gusting near any heavier showers gradually diminish tonight before increasing once again Thursday afternoon.

MARINE

Issued at 145 PM CDT Wed Oct 7 2026

Adverse to hazardous marine conditions will likely continue into the weekend. Expect persistent northeasterly winds around 15 to 20 knots with occasionally higher gusts, which will result in elevated seas around 5-7 feet. Additionally, increasing swell is expected as Tropical Storm Isaias travels north/northeast across the Gulf. A Small Craft Advisory will likely be needed for the offshore Gulf waters beginning tomorrow afternoon or night, and for the nearshore Gulf waters by Friday. Otherwise, periods of showers and thunderstorms are expected to continue through the end of the week, before decreasing this weekend and early next week.

PRELIMINARY POINT TEMPS/POPS

BROWNSVILLE 77 93 77 90 / 50 50 20 20 HARLINGEN 73 96 72 90 / 20 40 10 20 MCALLEN 76 98 75 92 / 10 40 0 10 RIO GRANDE CITY 74 97 72 91 / 10 20 10 10 SOUTH PADRE ISLAND 81 87 81 86 / 50 50 30 40 BAYVIEW/PORT ISABEL 76 91 76 88 / 40 40 20 30

BRO WATCHES/WARNINGS/ADVISORIES

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