textproduct: Houston/Galveston

KEY MESSAGES

- Heat Advisory remains in effect. Hot conditions will persist through at least mid-week. - Cannot rule out a rouge shower or thunderstorm at times into midweek, but chances will be quite low.

- Temperatures VERY slightly ease late in the week along with the potential for some isolated rain chances.

DISCUSSION

Issued at 1151 PM CDT Sat Aug 22 2026

The oppressive heat wave continues across the region as strong mid to upper level ridge over the Southern Rockies/West Texas stays in place through at least Wednesday. Subsidence aloft, along with warm and humid south to southwest surface winds will keep conditions hot and sticky. Forecast models remain consistent in placing 850 mb temperatures in the 22-26 degC range today through midweek, which translates to surface highs reaching the upper 90s to lo 100s. Expect highs mostly in the triple digits inland and in the mid 90s along the coast through Wednesday/Thursday. A Heat Advisory remains in effect today and is now in effect through Monday evening. Given the persistent warmth and humidity, the Advisory will likely need to be extended through at least Wednesday.

In terms of PoPs, the overall trend remains predominantly dry due to strong subsidence remaining in place. However, don't be entirely surprised if isolated showers or storms manage to develop during the afternoon hours as weak, subtle shortwaves ride along the southeastern fringe of the ridge. If any rain/storms do develop, they should dissipate around or shortly after sunset with the loss of daytime heating.

For those looking for relief from the heat, options remain limited. :( BUT temperatures should drop by a few degrees toward the end of the week. As the ridge aloft gradually shifts westward Thursday into the upcoming weekend, highs will ease slightly into the mid to upper 90s. Additionally, slightly weaker heights and an approaching backdoor front will bring at least a slight rain/storm chances late in the week.

JM

AVIATION

(06Z TAF Issuance) Issued at 1151 PM CDT Sat Aug 22 2026

VFR conditions prevail, across all TAF sites, with light and variable winds. Winds settle in the WSW tomorrow morning, then increase to about 7-10 kts and swing to the SSE by tomorrow afternoon. This evening, winds decrease and once again turn back to the WSW. Another round of intermittent MVFR/IFR CIGS are possible tonight, though are expected to be "FEW" and "SCT" in nature. MVFR VIS is possible, especially at KLBX where cooling overnight temps, increased moisture from onshore flow, and nearly calm winds are expected from about 10Z to 14Z. Tomorrow afternoon and evening, there is a low chance for some stray showers/thunderstorms, though confidence in location is too low to include in the TAFs.

MLG

MARINE

Issued at 1151 PM CDT Sat Aug 22 2026

Surface high pressure centered over the western Gulf will continue to result in light to moderate south to southwest winds and seas around 1 to 3 ft. Expect winds shifting to the southwest and west late at night and in the mornings, transitioning generally to the south in the afternoon and evening with the seabreeze.

JM

PRELIMINARY POINT TEMPS/POPS

College Station (CLL) 79 104 78 103 / 10 10 0 0 Houston (IAH) 81 103 80 102 / 0 10 0 0 Galveston (GLS) 83 92 83 92 / 0 0 0 0

HGX WATCHES/WARNINGS/ADVISORIES

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

GM...None.