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National Weather Service Forecast Discussion

508
FXUS64 KHGX 202319
AFDHGX

Area Forecast Discussion
National Weather Service Houston/Galveston TX
619 PM CDT Thu Aug 20 2026

...New AVIATION...

.KEY MESSAGES...

- Heat Advisory remains is in effect through Friday and will
  likely need to be extended into the weekend. High temps will be
  in the triple digits with heat index values peaking between
  106-112F.

- In general, rain chances will be very low for the next week, but
  we will need to keep an eye out for some isolated-scattered
  thunderstorm activity near the Piney Woods late Friday afternoon
  and evening.

- Hot weather expected to continue through next week.

&&

.DISCUSSION...
Issued at 1249 PM CDT Thu Aug 20 2026

Mid-upper ridging, centered to our northwest, will dominate area wx
for the next week. Highs will be in the triple digits and lows in
the upper 70s to low 80s. Heat index readings between 107-112F
are anticipated. Planning to let the Heat Advisory currently in
place through Friday ride for now, but we`ll very likely need to
extend that into the weekend or even next week. In fact, wouldn`t
be overly surprised if we might need to upgrade/embed a few
locations to a Warning (heat index 113F+) at times.

Like previous discussions have noted, rain chances will be on the
very low side. However, we`ll be on the lookout for disturbances
riding around the periphery of the ridge in the N/NE flow aloft
which may be able to trigger some iso-sct precip if things line
up exactly right and subsidence can briefly become overcome. That
type of situation is being monitored for the late afternoon and
evening hours on Friday up toward the Piney Woods region as a
batch of vorticity approaches. Confidence is average to below
average storms will initiate and maintain themselves in our
CWA...but if they do, some could be on the strong side. Elevated
wind gusts would be the primary concern. 47

&&

.AVIATION...
(00Z TAF Issuance)
Issued at 618 PM CDT Thu Aug 20 2026

Increased winds continue into the evening with gusts between 15-
20kts lasting in the early hrs of tomorrow morning. VFR conditions
continue to persist. A chance for brief BR when the sun begins to
peak over the horizon around KLBX does remain possible. Tomorrow a
frontal boundary well N of the area has the chance to bring the
development of ISOL TS/SH. Confidence remains low, but will be
monitored. Other then that similar conditions to today continue
tomorrow.

CMW

&&

.MARINE...
Issued at 1249 PM CDT Thu Aug 20 2026

Light to occasionally moderate southwest to south winds and 2 to
3 foot seas are expected over the next several days. Winds may
occasionally gust up to 20 knots during the afternoon in the bays,
and during the overnight hours in the Gulf. 47

&&

.PRELIMINARY POINT TEMPS/POPS...
College Station (CLL)  78 102  78 103 /   0  10  20  20
Houston (IAH)  80 101  80 102 /  20  10  20  20
Galveston (GLS)  84  92  82  92 /   0  10  10  10

&&

.HGX WATCHES/WARNINGS/ADVISORIES...
TX...Heat Advisory until 7 PM CDT Friday for TXZ163-164-176>179-
     195>200-210>214-226-227-235>238-300-313-335>338-436>439.

GM...None.
&&

$$

DISCUSSION...47
AVIATION...CMW
MARINE...47

NWS HGX Office Area Forecast Discussion