textproduct: Brownsville/Rio Grande Valley

This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.

KEY MESSAGES

Updated at 628 PM CDT Fri Mar 27 2026

Key Messages

* A weak cold front is expected tomorrow, which will slightly cool temperatures and create a low to moderate chance of showers tomorrow.

* Warm and dry weather is expected the rest of next week.

DISCUSSION

Issued at 1143 AM CDT Fri Mar 27 2026

A weak surface low is expected to trek across Central Texas on Saturday which will bring a weak cold front to Deep South Texas. The surface low will create enough instability that our region could see a low to moderate (20-40%) chance of isolated or scattered showers tomorrow morning and afternoon. Daytime highs will also cool into the low 80s tomorrow, due to a combination of the weak front and increased cloud cover.

Otherwise, the dominant pattern for this upcoming week is upper- level ridging, which will keep conditions warm and dry throughout the week. Temperatures are expected to warm back into the upper 80s/lower 90s again by Sunday gradually warm into the mid-upper 90s by next Friday. Some guidance is suggesting that the ridging pattern could break down by the end of the week as a Pacific shortwave approaches from the West by the end of the week, but exact impacts are uncertain.

AVIATION

(00Z TAFS) Issued at 628 PM CDT Fri Mar 27 2026

The passage of a cold front is anticipated during the overnight hours tonight. The PROB30 for precipitation has been removed from the previous suite of TAFs, as rain chances for Saturday appear a bit lower now. Still, isolated convection cannot be entirely ruled out. Overall, VFR will prevail through the next 24 hours.

MARINE

Issued at 1143 AM CDT Fri Mar 27 2026

Low to moderate winds and seas are expected with overall favorable marine conditons. Tomorrow's cold front may bring some showers offshore, but otherwise no Small Craft Exercise Caution or Small Craft Advisories are expected.

PRELIMINARY POINT TEMPS/POPS

BROWNSVILLE 66 83 65 84 / 0 30 20 30 HARLINGEN 61 82 61 85 / 10 30 20 20 MCALLEN 66 83 65 88 / 10 40 20 20 RIO GRANDE CITY 63 81 63 89 / 20 40 20 10 SOUTH PADRE ISLAND 69 75 69 77 / 10 30 20 20 BAYVIEW/PORT ISABEL 65 80 64 83 / 10 30 20 20

BRO WATCHES/WARNINGS/ADVISORIES

None.

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