Houston, Texas 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

833
FXUS64 KHGX 230006
AFDHGX

Area Forecast Discussion
National Weather Service Houston/Galveston TX
606 PM CST Mon Dec 22 2025

...New UPDATE, AVIATION...

.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, especially
  tonight through Wednesday morning.

- Last cold front of the year anticipated some time Sunday/Monday.

&&

.UPDATE...
Issued at 606 PM CST Mon Dec 22 2025

Based on consistent observations at or below 1/4 mile, a Dense Fog
Advisory has been issued for Galveston Island and the Bolivar
Peninsula through Tuesday morning. Model guidance points towards a
northward expansion of this advisory as we go into the
evening/overnight hours, so stay tuned for additional updates. If
you have plans to hit the roadways in the morning, please be sure
to take the proper precautions if you encounter dense fog: slow
down, increase distance from the vehicle in front of you, and use
your low-beam headlights.

Batiste

&&

.DISCUSSION...
Issued at 1216 PM CST Mon Dec 22 2025

Same pattern continues with onshore flow at the surface with a 586-
588 dam midlevel ridge moving east through Texas Today. Anticipating
temperatures 10-20 degrees above normal with highs in the 70s/lower
80s with lows in the upper 50s/60s. These temperatures will hit or
break records at some locations.

Sea fog remains the most interesting facet of the forecast in the
wake of yet another morning of widespread fog advisories. As we take
a peak at water temperatures, they have warmed slightly, though
generally remain in the mid to lower 60s. The Galveston Bay entrance
(north Jetty) has been slow to warm, reading 60.8F, perhaps as a
result of some cooler water temps being advected from easterly winds.
Still observing dewpoints in the upper 60s/lower 70s dewpoints
across the southern half of our CWA (mostly along/south of I-10).
Still some looming pockets of sea fog across the bays and nearshore
waters presently this afternoon, so it`s not entirely impossible
that this fog may linger throughout the rest of the daytime into
tonight, as backed up by model guidance. I would anticipate areas of
dense sea fog to fill in again tonight, slowly intruding inland
overnight into the early morning hours of Tuesday.

The extend, intensity and duration of sea fog will likely continue
to be rather severe through at least mid week. Working in our favor,
Model blends like the NBM suggest lower spatial coverage for sea fog
after this point with the gap between the NBM dewpoints and RTOFS
SST only around 1.0-2.0F. Plus, shallow areas could very much see
their water temperatures warm faster than models show. However,
there are plenty of signs to suggests that see fog could still be
rather potent beyond mid week. Presently, model water temperatures
are warmer than observed temperatures at the Galveston Bay Entrance.
Models also show winds oriented further E/ESE, which again would
help keep the water temperatures on the cooler side. In addition,
that Td/Tw gap over the bays/water in the NBM is likely a tad lower
than reality, as the model members that make up the NBM already
incorporate water temperature into their modeled dewpoint forecast.
Often in these sea fog patterns, you can see a divot in dewpoints in
these areas as models attempt to account for the cooler water
temperatures. Sometimes they can be too aggressive with lowering
dewpoints, thus making the Td/Tw depression appear smaller. Again,
the GLS bay entrance is reading a water temperature of ~61F, while
the Galveston ASOS has a dewpoint of 70F, approximately a 9F
difference compared to model guidance, which would show it as ~3F if
sampled at the bay entrance.

The main thing to take away from at this is that sea fog will likely
continue to be a daily issue through the end of the work week and
into portions of the weekend, at least until water temperatures warm
sufficiently to limit it. While it is certainly possible to see some
improvements after mid week, dense sea fog will likely return in
some form each night, though patchy and less widespread as the water
temperatures warm. It`s safe to say that Christmas eve and Christmas
day will be fairly foggy across the coastal plains as some of this
sea fog advects inland and meshes with nocturnal cooling & radiation
fog.

Good news is that the next cold front is anticipated to move through
SE Texas on Sunday, giving us one last cool-down with showers/storms
before end of the year. This will bring a more definitive end to
this current stretch of sea fog, if warming water temperatures
hasn`t already done so by that point.

03

&&

.AVIATION...
(00Z TAF Issuance)
Issued at 606 PM CST Mon Dec 22 2025

Dense sea fog remains ongoing at GLS leading to a consistent
period of LIFR conditions that will likely continue well into
Tuesday. Decreased ceilings and visibilities will expand northward
over the next few hours with widespread IFR/LIFR conditions
expected by 06Z. These degraded conditions will stick around
through 15Z-16Z before ceilings and visibilities begin to increase
again. Outside of GLS, visibilities will improve by 16Z with MVFR
ceilings lingering till 18Z-20Z then a return to VFR. Winds will
be generally southeasterly around 5-10 kt throughout the TAF
period. Another round of decreased ceilings and visibilities are
expected Tuesday evening through Wednesday morning as well.

Batiste

&&

.MARINE...
Issued at 1216 PM CST Mon Dec 22 2025

Visibility has improved this afternoon, though pockets of sea fog
are lingering in portions of the bays and nearshore Gulf waters,
especially east of Freeport. Some pockets of dense fog persist,
though even if they clear over the next few hours, dense sea fog
will likely fill back in this evening into Tuesday morning. The
potential for overnight and morning fog will need to be monitored
each night through Friday. Beyond that, conditions will be warm and
relatively calm with light southerly winds and seas 3 feet or less.

03

&&

.PRELIMINARY POINT TEMPS/POPS...
College Station (CLL)  66  79  63  77 /   0   0   0   0
Houston (IAH)  66  78  63  78 /  10   0   0   0
Galveston (GLS)  64  75  62  75 /   0   0  10   0

&&

.HGX WATCHES/WARNINGS/ADVISORIES...
TX...None.
GM...None.
&&

$$

DISCUSSION...03
AVIATION...Batiste
MARINE...03