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National Weather Service Forecast Discussion

915
FXUS64 KHGX 211820
AFDHGX

Area Forecast Discussion
National Weather Service Houston/Galveston TX
120 PM CDT Sun Jun 21 2026

...New DISCUSSION, MARINE...

.KEY MESSAGES...

- Heat will remain a concern through midweek, with heat indices
  nearing 107F (41-42C) and overnight lows only falling into the
  upper 70s to lower 80s (26-28C).

- A high risk of strong rip currents will continue through the
  next few days.

&&

.DISCUSSION...
Issued at 120 PM CDT Sun Jun 21 2026

After days of active weather, we`re finally beginning to see the
end of precip for a few days. Earlier showers and thunderstorms
have all but dissipated, with a few lingering showers moving
eastward and out of our area. The weak boundary and surface low
that generated the convection seem to have weakened and drifted
south as ridging builds in from the west. Clouds will linger for a
few more hours, keeping temps from warming too much, the exception
being our far northwest areas. Being the longest day of the year,
though, we`ll have enough time for highs to warm into the mid 80s.

Upper ridging will dominate the weather pattern through much of
the work work, with mid and upper level flow becoming more zonal.
This will cut us off from the deep layer moisture that`s been in
place, with drier air working it`s way in. We`ll go from nearing
the climatological max for PWs last week to nearing the 25th
percentile next week. Given the lower moisture and subsidence,
have kept very low PoPs in the forecast. Unfortunately, hot
conditions will also persist under the ridge, with highs climbing
into the mid 90s next week. Dewpoints will lessen and overnight
lows will fall into the mid 70s, so a slight reprieve from the
more oppressive heat. That said, heat indices will climb into the
triple digits, but should stay below heat advisory criteria,
except for maybe a few isolated spots.

&&

.AVIATION...
(18Z TAF Issuance)
Issued at 1205 PM CDT Sun Jun 21 2026

Gusty winds of 15-20KT are expected at all terminals through the
afternoon and early evening. Generally, winds are out of the SSE. Winds
remain elevated overnight, at 7-9KT inland and 10-15KT near the
coast. There is a low chance of thunderstorms this afternoon,
though a few scattered showers can`t be ruled out, which could
briefly lower visibility. CIGs prevail at VFR until an MVFR deck
settles in late this evening and overnight. CIGs are expected to
lift back to VFR and gusts return by mid- morning tomorrow.

&&

.MARINE...
Issued at 120 PM CDT Sun Jun 21 2026

Moderate onshore flow will persist through Monday morning,
followed by light to moderate onshore flow from midweek onward.
Seas of 3 to 6 feet are expected through Monday.

&&

.PRELIMINARY POINT TEMPS/POPS...
College Station (CLL)  78  93  78  94 /   0   0   0   0
Houston (IAH)  79  93  79  94 /   0   0   0   0
Galveston (GLS)  84  89  83  89 /   0   0   0   0

&&

.HGX WATCHES/WARNINGS/ADVISORIES...
TX...High Rip Current Risk through Monday evening for TXZ436>439.

GM...Small Craft Should Exercise Caution through Monday afternoon for
     GMZ330-335-350-355-370-375.

&&

$$

DISCUSSION...JTC
AVIATION...MLG
MARINE...JTC

NWS HGX Office Area Forecast Discussion