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National Weather Service Forecast Discussion

040
FXUS64 KHGX 181847
AFDHGX

Area Forecast Discussion
National Weather Service Houston/Galveston TX
147 PM CDT Sun Oct 18 2026

...New DISCUSSION, AVIATION, MARINE...

.KEY MESSAGES...

- Another cool and dry day expected for the rest of Sunday.

- Hazardous marine conditions persist offshore. Small craft
  should exercise caution until 7 PM CDT this evening. Conditions
  will continue improving overnight into Monday.

- Warmer temperatures return this week, but just seasonable in
  nature. Rain chances will generally remain low across our CWA
  outside of Tuesday, where a passing Gulf trough could bring rain
  to our offshore waters and Matagorda Bay.

&&

.DISCUSSION...
Issued at 140 PM CDT Sun Oct 18 2026

As high pressure sits overhead, the rest of Sunday will look similar
to Saturday, albeit a bit warmer. We can expect clear to partly
cloudy skies, highs in the low to mid 70s, and overnight lows in the
50s, with coastal locations seeing warmer lows in the 60s. Winds
remain somewhat elevated offshore, with recent measurements offshore
of Matagorda County indicating sustained winds of 20-25 mph and
gusts beyond that range. Therefore, small crafts should exercise
caution throughout the afternoon and evening hours.

Looking toward the upcoming work week, ridging to our NE will
provide easterly flow that will allow temperatures to warm back up.
The combination of ridging near the surface and in the mid-levels to
our SW will also keep us pretty dry, as evident in forecasted PWATs
generally staying under 1.5``. Therefore, PoPs through the week will
likely remain under 10%, with a notable exception on Tuesday as a
passing surface trough in the Gulf will likely bring rain to our
offshore waters, and possibly Matagorda Bay.

&&

.AVIATION...
(18Z TAF Issuance)
Issued at 140 PM CDT Sun Oct 18 2026

VFR conditions persist through the period. Winds will be NE/ENE at 5-
10 kts before becoming calm and variable this evening. Winds
strengthen by mid-morning tomorrow out of the ENE/E, with TAF sites
along and south of I-10 seeing sustained winds of 10-15 kts. Our
northern TAF sites will see lighter sustained winds in the 5-10 kt
range.

JMG

&&

.MARINE...
Issued at 140 PM CDT Sun Oct 18 2026

As high pressure transitions off to our east, a long fetch of
moderate easterly winds will set up across the northern Gulf Coast
this week. Speeds will generally be between 10 and 20 knots and
seas in the 3 to 5 foot range through midweek, though there could
be some intermittent periods of slightly higher speeds and seas in
the offshore Gulf waters which could warrant caution or advisory
flags for short time periods.

47

&&

.PRELIMINARY POINT TEMPS/POPS...
College Station (CLL)  52  77  55  82 /   0   0   0   0
Houston (IAH)  58  78  59  82 /   0   0   0   0
Galveston (GLS)  70  77  72  79 /  10   0   0   0

&&

.HGX WATCHES/WARNINGS/ADVISORIES...
TX...None.
GM...Small Craft Should Exercise Caution until 7 PM CDT this evening
     for GMZ370-375.

&&

$$

DISCUSSION...JMG
AVIATION...JMG
MARINE...47

NWS HGX Office Area Forecast Discussion