textproduct: Brownsville/Rio Grande Valley

KEY MESSAGES

Updated at 1207 PM CDT Sun Aug 2 2026

- A Heat Advisory is in effect for inland to coastal Kenedy, Willacy, and Cameron counties from 11 AM to 6 PM Sunday for Heat Indices between 111-113 degrees.

- Low to medium (15 to 50%) chance of isolated showers and thunderstorms today, mainly west of US281. - Hot will continue this week with Heat Indices between 105-110F, potentially higher, and a Major to Extreme risk of heat related illness.

DISCUSSION

Issued at 1207 PM CDT Sun Aug 2 2026

A cold front sagging south today will lead to some isolated to scattered showers and thunderstorms later this afternoon into this evening. Greatest chances will be late this afternoon into the evening in the Rio Grande Plains (40-50%) with lower chances eastward to US281 (15-35%). Could see some isolated activity east of US281 but chances remain less than 15%. The front will lift northeast later tonight into Monday and though the rest of the forecast remains generally rain free, can not rule out an afternoon seabreeze shower/thunderstorm.

Once again, the heat is on. Today there is a Heat Advisory in place for inland to coastal Kenedy, Willacy, and Cameron counties until 6 pm tonight for Heat Indices between 111-113 degrees. Temperatures will remain in the upper 90s and low 100s for the remainder of the forecast period with heat indices between 105 and 110 degrees. Special weather statements will likely be needed daily, but could also see some more Heat Advisories.

There is a Major (level 3 of 4) with pockets of Extreme (level 4 of 4) Heat Risk every afternoon into at least Tuesday, with little to no relief each night.

AVIATION

(18Z TAFS) Issued at 1207 PM CDT Sun Aug 2 2026

VFR conditions will prevail through the TAF period. There is a very low chance of an isolated shower or thunderstorm that may briefly affect the aerodromes, but confidence is low on probability and timing thus did not include in the TAF package.

MARINE

Issued at 1207 PM CDT Sun Aug 2 2026

An enhanced pressure gradient along the immediate coast will result in daily Small Craft Exercise Caution conditions along the Laguna Madre. Otherwise, expect light to moderate southeasterly winds with 2 to 3 ft seas and 5 to 6 second periods.

PRELIMINARY POINT TEMPS/POPS

BROWNSVILLE 79 97 81 97 / 0 0 0 0 HARLINGEN 76 101 77 101 / 0 0 0 0 MCALLEN 79 103 81 103 / 20 0 0 0 RIO GRANDE CITY 78 103 79 103 / 50 0 0 0 SOUTH PADRE ISLAND 80 89 81 89 / 0 0 0 0 BAYVIEW/PORT ISABEL 78 96 79 96 / 0 0 0 0

BRO WATCHES/WARNINGS/ADVISORIES

TX...Heat Advisory until 6 PM CDT this evening for TXZ251-254-255-351- 354-355.

GM...None.