textproduct: Brownsville/Rio Grande Valley

KEY MESSAGES

Updated at 500 PM CST Tue Jan 6 2026

- Patchy fog is expected to develop late tonight into tomorrow morning across portions of the region. - Above normal temperatures, with the potential for additional records to be broken, are expected through the end of the week.

- A cold front late this week will bring temperatures back towards seasonal norms for the weekend.

DISCUSSION

Issued at 1130 AM CST Tue Jan 6 2026

Another round of fog development is expected late tonight into tomorrow morning due to the combination of favorable low level moisture content and generally light winds. Most high res guidance indicates the best potential for dense fog will remain north of the region, but visibility falling below 3SM cannot be ruled out across portions of the region. Any fog should dissipate by mid morning tomorrow. Favorable conditions for fog development will likely continue each morning over the next few days, although increasing winds may limit this potential towards the end of the week.

Otherwise, above normal temperatures and rain-free conditions will continue through the end of the week across all of Deep South Texas. Breezy southerly to southeasterly winds return by mid to late week in response to a tightening pressure gradient ahead of a deepening upper level system translating across the Plains. This system will send a cold front towards the region by the end of the week, which will bring more seasonable temperatures heading into the weekend. Low rain chances may return over the weekend, but chances remain around 20 percent.

AVIATION

(00Z TAFS) Issued at 500 PM CST Tue Jan 6 2026

VFR tafs will prevail through much of the forecast period. Winds will decrease overnight and with ample moisture could see some patchy fog and lowered visibilities to around 5SM, mainly for a few hours near near daybreak with MVFR conditions.

MARINE

Issued at 1130 AM CST Tue Jan 6 2026

Generally favorable marine conditions will prevail through mid week over the Gulf waters and Laguna Madre with generally low seas and light to moderate southerly winds. Small Craft Exercise Caution conditions return by Wednesday afternoon in response to a tightening pressure gradient. Brief Small Craft Advisory conditions are possible on Thursday during the mid morning to afternoon hours, and once again this weekend in wake of the passage of a cold front. Low rain chances (20-40%) return this weekend over the Gulf waters and Laguna Madre.

PRELIMINARY POINT TEMPS/POPS

BROWNSVILLE 67 83 70 85 / 0 0 0 0 HARLINGEN 63 85 66 87 / 0 0 0 0 MCALLEN 67 88 68 90 / 0 0 0 0 RIO GRANDE CITY 63 89 65 88 / 0 0 0 0 SOUTH PADRE ISLAND 69 78 71 78 / 0 0 0 0 BAYVIEW/PORT ISABEL 65 83 67 84 / 0 0 0 0

BRO WATCHES/WARNINGS/ADVISORIES

TX...None. GM...None.