Skip to main content.

National Weather Service Forecast Discussion

Related quick links> 5 Day Forecast, Local Advisories, Drought Monitor, UV Forecast, Air Quality Forecast 
226
FXUS64 KHGX 181752
AFDHGX

Area Forecast Discussion
National Weather Service Houston/Galveston TX
1252 PM CDT Tue Aug 18 2026

...New AVIATION...

.KEY MESSAGES...

- Hot and dry conditions to prevail.

- Heat indices should be in the 103-107F range today and
  Wednesday...possibly trending up a touch after that. We`ll
  monitor for potential future Heat Advisories. Regardless of
  whether an advisory is in effect on any given day, heat
  precautions/messaging remain the same for those with plans or
  working outdoors.

- Rain chances currently mainly remain too low to advertise for
  most locations at the current time.

&&

.DISCUSSION...
Issued at 1220 PM CDT Tue Aug 18 2026

Broad mid-upper ridging stretching from SoCal-Texas-northern Gulf
Coast will keep hot & dry wx in place. With some troughing
developing across the eastern CONUS during the second part of the
week, the ridge should become repositioned across the Four Corners
area/Rockies/Southern Plains well into next week. Locally, heights
generally remain about the same on a daily basis, so overall
temperatures should be about status quo with highs approaching the
triple digits and lows in the upper 70s-low 80s.

In terms of heat advisories, dewpoints have been mixing out the past
few days and keeping us below thresholds. There are signs that some
slightly higher llvl moisture levels make their way into the area
in a few days which could potentially allow for more coverage of
108F+ heat index readings. Just something we`ll be keeping an eye
on. In the meantime, typical late summer heat precautions should
be taken whether there`s a headline in the fcst or not.

In terms of rain: chances generally look low to nil. Cannot
completely rule out a rouge, short-lived shower popping up around
the coast (like we`re currently seeing near Angleton)...but
they`ll be insignificant and most of us won`t see much of anything.
Also, we`ll be monitoring trends Friday night and into the
weekend as some guidance suggests the potential for some
disturbances/precip upstream in the n/ne flow aloft to sag into,
or close, to the region. Forecast confidence is low in those
regards, but we might be able to add some lowish POPs into the
fcst should we see better model consistency.  47

&&

.AVIATION...
(18Z TAF Issuance)
Issued at 1245 PM CDT Tue Aug 18 2026

VFR conditions generally expected to prevail through the period at all
sites. A few showers have developed along the seabreeze which may
reach KLBX early this afternoon and bring a brief period of MVFR cigs/vis.
South winds up to around 10 kt will veer more SW overnight, then return
to southerly after sunrise. There may be some threat of spotty reduced
cigs/vis for inland sites in the 09-13z time frame, but it seems quite
limited and confidence is low so have left this out of TAFs for
now.

WFO LCH

&&

.MARINE...
Issued at 1220 PM CDT Tue Aug 18 2026

With surface high pressure situated across the north central Gulf,
look for light to moderate southwest to south winds for the next
several days. Some gusts to 15-20kt are possible in the bays during
the late afternoon and evening hours, and in the Gulf waters
overnight. Seas in the 2-4ft range should generally prevail. 47

&&

.PRELIMINARY POINT TEMPS/POPS...
College Station (CLL)  79 100  77 101 /   0   0   0   0
Houston (IAH)  80  99  78  99 /   0   0   0   0
Galveston (GLS)  84  92  84  92 /   0   0   0   0

&&

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

$$

DISCUSSION...47
AVIATION...WFO LCH
MARINE...47

NWS HGX Office Area Forecast Discussion