textproduct: Brownsville/Rio Grande Valley

KEY MESSAGES

Updated at 543 AM CST Tue Jan 27 2026

- Arctic airmass over the region results in subfreezing temperatures again tonight, possibly meeting or breaking record lows.

- A Freeze Warning and a Cold Weather Advisory are in effect until 10 AM Tuesday for all of inland Deep South Texas, except for the barrier islands.

- Please visit www.weather.gov/safety/cold for recommendations to keep yourself and others protected from the cold.

- Gradual warmup Tuesday into Thursday and chances of rain increase Thursday and Thursday night ahead of a cold front arriving late Thursday night or Friday morning.

- Northerly winds behind the front could lead to subfreezing temperatures once again over the weekend.

DISCUSSION

Issued at 1012 PM CST Mon Jan 26 2026

Cold air advection and efficient radiational cooling from clear skies within the Arctic air mass over Deep South Texas bring another night of subfreezing temperatures tonight into inland and coastal Deep South Texas as a 1035-1040 mb Arctic surface high over central Texas maintains light northerly winds into Tuesday morning. A Freeze Warning and a Cold Weather Advisory remain in effect for all inland and coastal areas of Deep South Texas, not including the barrier islands. Overnight minimum temperatures are expected to fall to the low/mid 20s across the Northern Ranchlands and Rio Grande Plains, but feel as cold as 15-25 degrees F, while temperatures across the Rio Grande Valley bottom out in the mid/upper 20s with "real feel"/apparent temperatures in the low/mid 20s. Meanwhile, temperatures along the Lower Texas coast reach the mid 40s with apparent temperatures in the upper 30s/low 40s. As was the case last night, minimum temperatures tonight/Tuesday morning could meet or break record low temperatures. Please visit www.weather.gov/safety/cold for recommendations to keep yourself and others protected from the cold.

Weather pattern wise, zonal or northwesterly flow continue aloft through this week and into the beginning of next week. Tuesday starts off with mainly clear skies and northerly surface winds, shifting to easterly/southeasterly throughout the afternoon and early evening hours as the high pressure, mentioned above, moves to the Gulf coast of the Deep South ahead of a mid-level shortwave moving into Texas Tuesday night. As the trough passes to the north of the CWA, winds shift back to northerly into Wednesday morning as a surface high regains control over the Southern Plains. Clouds clear throughout the day Wednesday and winds veer back to easterly Wednesday night into Thursday as the high moves into the northern Gulf. Another mid-level shortwave arrives over the Southern Plains Wednesday night into Thursday, developing a surface low and attendant cold front over northern Texas. Moisture pooling ahead of the front builds clouds across our region on Thursday and increases chances of rain along/near the coast Thursday evening to as much as a low (15-30%) chance Thursday night. The cold front may pass through Deep South Texas late Thursday night or Friday morning, shifting winds out of the north. Ridging aloft resumes Friday, diminishing rain chances throughout Friday.

As for temperatures, another very chilly night is expected Tuesday night as overnight lows fall to the mid/upper 30s across the northern Ranchlands and Rio Grande Plains while upper 30s/40s are anticipated across the Rio Grande Valley along with 50s at the beaches. As such, neither a Freeze Warning nor a Cold Weather Advisory are expected. The LREF and NBM suggest, at most, a 15% and 30% chance, respectively, for portions of the Northern Ranchlands falling below 32 degrees. So, a few spots may briefly fall to or below freezing to the north, but not expected to be widespread or long enough to issue any cold weather products. Otherwise, temperatures moderate Tuesday into Thursday with highs reaching into the 50s/60s on Tuesday, 60s on Wednesday and mainly 70s on Thursday. Overnight lows fall to the 40s Wednesday and Thursday nights. Behind the cold front, temperatures drop over the weekend with subfreezing temperatures possible again Friday and Saturday night. Temperatures could warm again in the early part of next week as southeasterly winds return.

Due to lighter winds over the Gulf, conditions continue to improve along the coast, although a medium risk of rip currents continues through Tuesday afternoon.

AVIATION

(12Z TAFS) Issued at 543 AM CST Tue Jan 27 2026

Mostly clear skies and light north winds prevail across Deep South Texas early this morning. Mainly light north to northeast winds are expected this morning into the afternoon. Winds may briefly become easterly during the afternoon. Light and variable winds are forecast for this evening into the overnight hours. There is a low (10-30%) chance of some MVFR ceilings impacting the local terminals late tonight, mainly after 09Z. Otherwise, VFR conditions will continue for the next 24 hours.

MARINE

Issued at 1012 PM CST Mon Jan 26 2026

Conditions continue to improve over the Lower Texas coastal waters tonight into Tuesday with slight (1-2 feet) seas returning by the afternoon hours and northerly winds becoming easterly by evening. A building high pressure shifts winds out of the north Tuesday night, becoming moderate with slight to moderate (2-3 feet) seas on Wednesday, diminishing to gentle Wednesday night and southeasterly by Thursday morning. Chances of rain increase Thursday afternoon to as much as a low to medium (30-60%) chance Thursday night ahead of a cold front passing through late Thursday night or Friday morning. Strong northerly winds arrive on Friday in wake of the front, likely bringing Small Craft Advisory and Small Craft Exercise Caution headlines into the weekend as seas elevate. Chances of rain decrease Friday into Saturday.

PRELIMINARY POINT TEMPS/POPS

BROWNSVILLE 62 50 67 52 / 0 0 0 0 HARLINGEN 61 44 67 47 / 0 0 0 0 MCALLEN 62 47 68 50 / 0 0 0 0 RIO GRANDE CITY 60 38 67 42 / 0 0 0 0 SOUTH PADRE ISLAND 62 56 64 58 / 0 0 10 0 BAYVIEW/PORT ISABEL 62 49 66 52 / 0 0 0 0

BRO WATCHES/WARNINGS/ADVISORIES

TX...Cold Weather Advisory until 10 AM CST this morning for TXZ248>255-351-353>355.

Freeze Warning until 10 AM CST this morning for TXZ248>255-351- 353>355.

GM...None.