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 1000 PM CST Fri Dec 19 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
(06Z TAFS) Issued at 1000 PM CST Fri Dec 19 2025
VFR conditions will prevail for much of the TAF cycle, bar a bout of fog Saturday morning reducing visibility to MVFR to LIFR around 08Z-15Z. LIFR vsbys are possible through the entire aforementioned window, but highest confidence of timing is denoted in TAFs. Fog should dissipate as southerly winds increase Saturday morning, which become gusty to 20-25kts by the afternoon.
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 76 61 84 69 / 0 0 0 0 HARLINGEN 76 56 85 65 / 0 0 0 0 MCALLEN 77 59 87 66 / 0 0 0 0 RIO GRANDE CITY 77 56 87 60 / 0 0 0 0 SOUTH PADRE ISLAND 71 66 76 70 / 0 0 0 0 BAYVIEW/PORT ISABEL 74 60 82 66 / 0 0 0 0
BRO WATCHES/WARNINGS/ADVISORIES
TX...Dense Fog Advisory from 3 AM to 9 AM CST Saturday for TXZ248>255- 351-353>355.
GM...None.
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