textproduct: Brownsville/Rio Grande Valley

KEY MESSAGES

Updated at 933 PM CDT Mon Apr 20 2026

Key Messages:

* Lingering sprinkles/showers through Tuesday.

* Mainly dry Wednesday through early next week with warming temperatures.

* A High Risk for Rip Currents remains in effect till Tuesday morning.

* Mostly adverse (Small Craft Exercise Caution) marine conditions to continue through Friday.

DISCUSSION

Issued at 933 PM CDT Mon Apr 20 2026

Latest GOES-19 visible satellite and radar imagery depicted a BKN- OVC deck of low level stratus and stratocumulus clouds overhead. A few sprinkles were around, but the main rain shower activity remains offshore. This activity is associated with a coastal trough overhead that has been meandering over the region over the past couple of days. Through Tuesday morning, expect for any lingering showers to come to an end as the coastal trough departs to our north. Extensive cloud cover will continue through the day on Tuesday though showing gradual improvements during the afternoon into the evening hours. High temperatures will remain cooler than normal for late April with values topping out in the lower 80s.

Mainly rain-free weather will persist through the early parts of next week. Meanwhile, a warming trend will take place Wednesday through Monday of next week. Wednesday through Saturday, high temperatures will range from the upper 80s to lower 90s near the coast to the upper 90s west. Sunday through Monday, temperatures heat up slightly in response to a strengthening 591 dam sub- tropical heat dome to our south across central Mexico. Daytime highs are progged to be in the low to mid 90s near the coast to the upper 90s west. Overnight low temperatures will mainly be in the 70s through early next week.

AVIATION

(18Z TAFS) Issued at 1228 PM CDT Tue Apr 21 2026

Light rain showers moving northward will continue periods of MVFR through the afternoon. Showers moving over a site may briefly reduce ceiling conditions to MVFR. This evening, showers diminish and leave a window for VFR. Low cigs return around midnight, bringing MVFR to IFR conditions through the morning.

MARINE

Issued at 933 PM CDT Mon Apr 20 2026

Mostly adverse (Small Craft Exercise Caution) conditions will be in place through Friday with wave heights over the Gulf Waters mainly between 4-6 feet. Saturday through Monday of next week, marine conditions become more favorable with light to moderate winds and moderate seas.

PRELIMINARY POINT TEMPS/POPS

BROWNSVILLE 71 85 72 87 / 10 10 0 0 HARLINGEN 68 87 68 89 / 10 10 0 0 MCALLEN 72 90 72 91 / 10 10 0 0 RIO GRANDE CITY 70 90 70 93 / 10 0 0 0 SOUTH PADRE ISLAND 73 79 73 80 / 10 10 0 0 BAYVIEW/PORT ISABEL 70 84 70 85 / 10 10 0 0

BRO WATCHES/WARNINGS/ADVISORIES

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