textproduct: Brownsville/Rio Grande Valley

KEY MESSAGES

Updated at 630 AM CDT Thu Apr 30 2026

Key Messages:

- Mainly rain-free and warmer than normal conditions will prevail through the middle parts of next week.

- There is a low-medium (20-60%) chance for showers and thunderstorms along a cold front Friday into Saturday.

- Cooler than normal temperatures are expected over the weekend.

- Hazardous marine and coastal conditions are likely Friday evening through Saturday night/Sunday.

DISCUSSION

Issued at 849 PM CDT Wed Apr 29 2026

Rain-free weather conditions and warmer than normal temperatures will prevail through much of the forecast period, courtesy of high pressure and a zonal flow aloft pattern largely in place. Showers and thunderstorms are possible Friday into Saturday in response to a cold front that will pass through the region. Currently, there is a low-medium (20-60%) chance for showers and thunderstorms to occur during this time period with the greatest chances being Friday night. Cooler than normal temperatures are expected Saturday through Sunday, following the passage of the cold front.

High temperatures mainly will be in the upper 80s to 90s through the forecast period. On Saturday, highs will be in the 70s. Sunday and Monday, highs will be in the 80s. Overnight lows will mainly be in the 60s/70s. Friday night and Saturday night, lows will be in the 50s and 60s.

AVIATION

(12Z TAFS) Issued at 630 AM CDT Thu Apr 30 2026

MVFR ceilings, with brief IFR ceilings, will prevail through the mid to late morning hours across the region before improving to VFR through the afternoon hours. An uptick in wind speeds is expected by mid to late morning in response to a tightening pressure gradient, which will result in southeasterly winds gusting to around 20-25 knots. Otherwise, another round of stratus is expected to develop tonight.

MARINE

Issued at 849 PM CDT Wed Apr 29 2026

Generally favorable marine conditions will be in place through the forecast period with light to moderate winds and moderate seas. The only exception will be Friday night through Saturday evening, where hazardous (Small Craft Advisory) conditions will take place.

PRELIMINARY POINT TEMPS/POPS

BROWNSVILLE 90 76 91 62 / 0 0 10 60 HARLINGEN 92 73 93 60 / 0 0 10 60 MCALLEN 95 76 94 62 / 0 0 10 60 RIO GRANDE CITY 95 75 89 59 / 0 10 20 40 SOUTH PADRE ISLAND 82 76 83 66 / 0 0 10 60 BAYVIEW/PORT ISABEL 88 74 88 62 / 0 0 10 60

BRO WATCHES/WARNINGS/ADVISORIES

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