textproduct: Houston/Galveston

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

(18Z TAF Issuance) Issued at 1249 PM CDT Thu Aug 20 2026

VFR conditions will mostly prevail. Like previous days, there could be some intermittent MVFR cigs/fog (generally along and west of I-45) between 9-14z. We will need to keep an eye out for some potential late afternoon and evening storms around the Piney Woods area on Friday. Confidence is not high enough to include the mention in the UTS/CXO TAFs attm, but something we'll be taking a look.

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.