textproduct: Houston/Galveston

KEY MESSAGES

- An isolated shower/thunderstorm or two remains a small possibility into Thursday, but the vast majority of the area will remain dry.

- Slightly higher chances of rain on Friday as a brief surge of deeper Gulf moisture moves into the area.

- August heat will continue. Heat index values may flirt around Heat Advisory criteria at times for some locations.

DISCUSSION

Issued at 1234 PM CDT Wed Aug 12 2026

A few isolated coastal showers are trying to pop up on the radar early this afternoon. We'll probably see a cell or two try to get going further inland later today, but overall coverage will be low and they'll quickly dissipate early in the evening with the loss of heating. Somewhat similar scenario on Thursday too, but with even less moisture to work with, POPs aren't really worth mentioning for most areas.

Heading into Friday, the northern periphery of some deeper Gulf moisture seen on sat pix near the Yucatan (associated with a mid level inverted trof) should briefly track into the region and slightly enhance rain chances (20-35%).

As this trof makes it further wwd into Mexico, we'll see strengthening ridging building in from the east over the weekend into early next week. With building heights, subsidence, and lower PW's...rain chances will be at a minimum or nil.

In terms of temperatures, we're looking for highs in the 96-100F range inland and low 90s at the beaches. Heat index readings will peak between 105-110 most days (flirting with the 108F advisory criteria for some locations at times). Currently, I'm not planning to issue one for Thursday considering gusty southerly winds should provide somewhat of a "relief"...but future shifts will continue to re-evaluate things. Regardless of an advsy or not, the usual heat precautions/messaging remains the same. 47

AVIATION

(18Z TAF Issuance) Issued at 1234 PM CDT Wed Aug 12 2026

Clouds will continue to speckle the sky across the area keeping conditions VFR through the evening hours. Increasing winds, with gusts up to 20kts out of the SSE, will persist through the day before decreasing to around 5-8kts overnight. The chance for a rouge TS/SH induced by the sea breeze remains low, but can't be ruled out. Again, the chance for MVFR CIGs and BR to develop in the western and northern portions does remain tomorrow morning between 10-14z. CW

MARINE

Issued at 1234 PM CDT Wed Aug 12 2026

A prevailing south to southeast flow will continue for the next several days. Winds are expected to increase to 15-20kt tonight and remain somewhat elevated into Friday as the pressure gradient tightens. This will allow seas to build into the 3 to 5 foot range. Caution flags will probably need to be hoisted in the evening forecast update. As higher pressure builds into the region from the east this weekend, winds and seas should gradually diminish. 47

PRELIMINARY POINT TEMPS/POPS

College Station (CLL) 77 99 76 97 / 0 0 0 20 Houston (IAH) 80 97 79 96 / 0 20 0 30 Galveston (GLS) 84 91 84 91 / 10 10 10 20

HGX WATCHES/WARNINGS/ADVISORIES

TX...None. GM...None.