textproduct: Houston/Galveston

KEY MESSAGES

- Long stretch of unseasonably warm weather with temperatures 10-20 degrees above normal. These temperatures will be near daily record high values, and a few records may fall throughout the week.

- Daily visibility reductions due to fog and sea fog, especially across the bays and coastal areas. The main threat for fog will be during the nighttime and early morning hours.

DISCUSSION

Issued at 1035 PM CST Sun Dec 21 2025

The calendar is reading December, but the forecast is giving end of October/early November. High pressure aloft and southerly flow at the surface bringing warm, moist air into the region will continue the unseasonably warm weather through the rest of this week. High temperatures will be in the upper 70s to low 80s (about 15 degrees above normal) and overnight lows in the low t0 mid 60s (about 20 degrees above normal). We will be within a few degrees of record temperatures through at least Friday or Saturday. Guidance does indicate a cold front bringing a return of seasonal weather next weekend, but there is uncertainty on if the front will make it through the region or stall to the north.

The most impactful weather this week will be the chance of dense fog each night through at least midweek. The chance of widespread, dense fog will be highest along the coast developing in the late evening hours that persist through the mid-morning. There is a chance for patchy fog to remain over parts of the coastal waters through the afternoon hours, but more on that in the Marine section below.

Fowler

AVIATION

(00Z TAF Issuance) Issued at 507 PM CST Sun Dec 21 2025

VFR conditions and light winds persist for most locations, but LIFR conditions are ongoing at GLS due to sea fog. Widespread IFR/LIFR conditions are expected eventually overnight, but the timing of when this occurs on a per-terminal basis depends on their proximity to a weak frontal boundary. As of 23Z/Sunday, the front is currently near CXO and is not anticipated to go any further south than potentially IAH. As a result, the southern terminals will see decreasing ceilings/visibilites a few hours quicker than the northern terminals. With winds being much lighter tonight, dense fog is expected to pose more of an impact to most terminals especially in the 09Z-15Z timeframe. Outside of GLS, visibilities will improve by 16Z with MVFR ceilings lingering till 18Z-20Z. Sea fog is expected to linger around GLS throughout the day, so IFR/LIFR conditions prevail for the entire TAF period.

High resolution model guidance also indicated to the potential for isolated showers Monday morning and into the afternoon, but the probabilities are too low to include a mention of it in any of the TAFs at the moment.

Batiste

MARINE

Issued at 1035 PM CST Sun Dec 21 2025

A Dense Fog Advisory remains in effect through Monday morning with areas of dense fog (visibilities less than 1nm) expected in the Bays and nearshore waters. The fog will become patchier through the afternoon, but pockets of dense fog will be possible all day long in the nearshore waters/bays. If these areas remain widespread enough, the Advisory may be extended through the afternoon. This cycle will continue through at least midweek with areas of dense fog redeveloping each evening that persist through the morning, then patchy fog possible during the afternoon hours. By Thursday, ocean temperatures should warm up enough to help limit fog development, but patchy fog may continue to be possible.

Other than the fog, expect light southerly winds and low seas to prevail through this week.

Fowler

PRELIMINARY POINT TEMPS/POPS

College Station (CLL) 58 78 65 80 / 0 0 0 0 Houston (IAH) 66 79 66 80 / 10 10 0 0 Galveston (GLS) 65 71 64 71 / 10 10 0 0

HGX WATCHES/WARNINGS/ADVISORIES

TX...Dense Fog Advisory until 10 AM CST Monday for TXZ214-236>238-300- 313-335>338-436>439.

GM...Dense Fog Advisory until 10 AM CST Monday for GMZ330-335-350-355.