479
FXUS64 KHGX 271747
AFDHGX

Area Forecast Discussion
National Weather Service Houston/Galveston TX
1247 PM CDT Mon Jul 27 2026

...New DISCUSSION, MARINE...

.KEY MESSAGES...

- Dangerous heat building this week with temperatures in the upper
  90s/100s and heat indices of 104-112F. Heat Advisory in effect
  for Tuesday afternoon and will likely be needed for each
  afternoon through Friday.

- Patchy fog possible during the early to mid-morning hours for at
  least the next few days.

&&

.DISCUSSION...
Issued at 1127 AM CDT Mon Jul 27 2026

If you like the idea of going to a sauna covered in a hot wet
blanket, then this forecast is for you.

High pressure will continue to reign over southeast Texas as a
596-598 dam mid-level high centers itself over north Texas. It
will remain parked there through at least mid-week and tag team
with south-southeasterly winds to bring hot temperatures and
elevated dew points. The combination of the heat and humidity will
result in heat indices in the 105F to 110F range through the end
of the week. This has led to the issuance of a Heat Advisory for
Tuesday afternoon (and will likely need to be continued for each
afternoon through Friday).

Unfortunately there won`t be much relief during the overnight
hours as lows remain in the upper 70s to low 80s. Overnight
humidity and calm winds may lead to instances of patchy fog in the
early to mid-morning hours over the next few days.

Rain chances remain nil through much of the period as PW values
drop to around 1.3" (roughly 10th percentile for this time of
year).

The high will retrograde west into the Four Corners region later
in the week and a surface low is projected to develop in the
Southern Plains around mid week. While this still isn`t expected
to produce an uptick in PoPs through Friday, an upper level trough
draped over the eastern CONUS may be close enough in proximity to
at least bring some precipitation to our eastern CWA this weekend
into early next week (at this time chances are pretty low
~20-30%), but in any case something to keep an eye out for as we
get further into the week.

With heat indices expected to be in the Advisory range for the
next several days, please continue to keep heat safety in mind for
any outdoor activities. Know the signs of heat-related illnesses,
stay hydrated, and take frequent breaks from the heat. Also,
please remember to LOOK BEFORE YOU LOCK, and bear in mind that if
the pavement is too hot for your palm, it is too hot for your
pets` paws.

Bailey

&&

.AVIATION...
(12Z TAF Issuance)
Issued at 613 AM CDT Mon Jul 27 2026

VFR conditions expected today and into the overnight hours. Can`t
completely rule out some patchy late night/early morning fog for
areas along I-10 & west of I-45 as SREF hints at. But for now,
will just add the mention for high end MVFR at CXO/LBX in the 12z
set of TAFs and see how things trend. 47

&&

.MARINE...
Issued at 1127 AM CDT Mon Jul 27 2026

Calm marine conditions continue with light to occasionally
moderate southerly/southwesterly winds and 2-4 ft seas prevailing
through the week.

Bailey

&&

.PRELIMINARY POINT TEMPS/POPS...
College Station (CLL)  97  76  98  77 /   0   0   0   0
Houston (IAH)  99  78 100  79 /   0   0   0   0
Galveston (GLS)  91  83  92  83 /   0   0   0   0

&&

.HGX WATCHES/WARNINGS/ADVISORIES...
TX...Heat Advisory from noon to 7 PM CDT Tuesday for TXZ163-164-
     176>179-195>200-210>214-226-227-235>238-300-313-335>338.

GM...None.
&&

$$

DISCUSSION...Bailey
AVIATION...47
MARINE...Bailey

NWS HGX Office Area Forecast Discussion