textproduct: Brownsville/Rio Grande Valley

KEY MESSAGES

Updated at 634 AM CDT Sun Apr 5 2026

Key Messages:

* The Weather Prediction Center includes all of our County Warning Area within a Marginal Risk (Level 1/4) of isolated flash flooding for Sunday.

* An additional 0.5 to 1.5 inches of rain is likely across most of the area Sunday.

* A medium risk of rip currents continues through tomorrow afternoon and marine/coastal conditions are likely to become adverse tomorrow and into the beginning parts of next week.

DISCUSSION

Issued at 1104 PM CDT Sat Apr 4 2026

In the wake of the cold front tonight, cooler temperatures are forecast Sunday through the middle of next week. An overrunning pattern looks to keep rain chances elevated through the day Sunday with rain chances beginning to drop off Monday. The thunderstorm potential looks to decrease behind the front, as limited elevated instability drops off rapidly Sunday morning. However, deep mid- level moisture could still support heavy rainfall, with PWAT values ranging from 1.5-2 inches through much of the day Sunday. Probabilistic NBM still supports an additional 0.5 1.5 inches of rain Sunday.

Low temperatures are forecast to fall into the 50s to low 60s tonight High temperatures Sunday will likely range from the low 60s to mid 70s, with lows Sunday nigh in the 50s across most of the area. A gradual warming trend will likely raise afternoon highs back into the 80s by mid-week.

Rain chances look to increase again near the end of the week as an upper level shortwave moves across South Texas.

AVIATION

(12Z TAFS) Issued at 634 AM CDT Sun Apr 5 2026

A cold front has nearly completed its transition through Deep South Texas and the Rio Grande Valley. MVFR to VFR will prevail at the aerodromes with breezy winds, overcast skies, and a continual threat of convection.

MARINE

Issued at 1104 PM CDT Sat Apr 4 2026

A Small Craft Advisory is in effect from 7 AM to 1 PM Sunday, but may need to be extended or replaced with Small Craft Should Exercise Caution headlines. Strong northerly winds and elevated seas will begin to improve by Monday, with generally favorable conditions forecast to return by Tuesday morning and continue through the end of the period.

PRELIMINARY POINT TEMPS/POPS

BROWNSVILLE 75 58 70 58 / 100 80 60 20 HARLINGEN 73 55 71 54 / 90 80 50 10 MCALLEN 72 59 72 58 / 90 80 30 10 RIO GRANDE CITY 68 55 69 56 / 90 80 30 10 SOUTH PADRE ISLAND 74 65 69 66 / 90 80 60 20 BAYVIEW/PORT ISABEL 76 59 71 60 / 90 80 50 20

BRO WATCHES/WARNINGS/ADVISORIES

TX...None. GM...Small Craft Advisory until 1 PM CDT Monday for GMZ130-132-135- 150-155-170-175.