textproduct: Brownsville/Rio Grande Valley

KEY MESSAGES

Updated at 512 AM CST Sat Dec 20 2025 - Unseasonably warm temperatures and dry weather is expected this weekend through next week.

- Patchy fog could develop overnight for the next few days, reducing visibilities on roads and at airports.

DISCUSSION

Issued at 1000 PM CST Fri Dec 19 2025

High pressure building over central US will bring unseasonably warm temperatures and dry weather through much of next week. Light winds and mostly clear skies overnight will increase the potential for fog to form in the early morning hours. Tonight, lows in the 50s will be accompanied by fog. Widespread fog in the northern Ranchlands and Hidalgo County, and areas of fog in the remainder of the CWA are expected, with dense fog reducing visibilities to a quarter mile or less possible. A Dense Fog Advisory is in effect from 3 AM to 9 AM for the CWA except Islands, which will likely still experience reduced visibility - just patchier than inland. Fog is expected to clear mid to late morning as southerly winds become gusty to around 20-25kts. Another round of fog is possible Sunday morning. Monday morning, there is a low (less than 20%) chance of rain primarily along the coast with an offshore disturbance.

AVIATION

(12Z TAFS) Issued at 512 AM CST Sat Dec 20 2025

Currently LIFR conditions are impacting all TAF sites and are expected to do so until mid-morning where the fog will finally lift. This will allow for VFR conditions to persist over the region and with winds gusting around 20 knots out of the southeast as well. During the evening hours winds are expected to diminish again. This in turn could allow for fog to redevelop during the overnight hours and into the early morning hours tomorrow.

MARINE

Issued at 1000 PM CST Fri Dec 19 2025

Favorable conditions will persist through next week, with southerly to onshore winds and slight seas. There is a low (20-30%) chance of showers on Monday morning over the Gulf waters, otherwise, expect dry conditions to prevail.

PRELIMINARY POINT TEMPS/POPS

BROWNSVILLE 83 69 85 69 / 0 0 0 20 HARLINGEN 86 65 86 66 / 0 0 0 10 MCALLEN 87 66 88 69 / 0 0 0 10 RIO GRANDE CITY 87 59 86 62 / 0 0 0 10 SOUTH PADRE ISLAND 77 70 77 69 / 0 0 10 20 BAYVIEW/PORT ISABEL 82 67 83 67 / 0 0 0 20

BRO WATCHES/WARNINGS/ADVISORIES

TX...Dense Fog Advisory until 9 AM CST this morning for TXZ248>255- 351-353>355.

GM...None.