textproduct: Houston/Galveston

KEY MESSAGES

- Scattered showers possible again on Wednesday. Better chances generally west of I-45.

- Slightly drier air briefly moves in from the east on Thursday.

- Scattered rain chances return Friday through the weekend as moisture levels increase and some upper level disturbances pass through.

DISCUSSION

Issued at 1225 PM CDT Tue Oct 27 2026

Though very light in terms of accumulations, precip coverage has overperformed today. A similar type pattern will remain in place on Wed with higher PW air situated across southern and western parts of the region and some weak upper disturbances in the vicinity. Precip should mostly wane later today and this evening. Deterministic guidance and CAMs depict additional scattered activity redeveloping near the Matagorda Bay area up to the Brazos Valley Wed morning. Will add some lowish POPs back to around the I-45 corridor out of respect for the wetter ECMWF and any surprises other guidance might not be picking up on like today.

We should briefly see some recycled drier air filter into the region from the east on Thursday so will lower/remove POPs then, but start bringing them back into the forecast Friday and into the weekend. This is when we should see the higher PW air return, llvl ridging weakening a bit, and some shortwave activity embedded in the swly flow aloft track newd out of Mexico and across Texas into the Southern Plains. Things don't look like a complete washout, but there will likely be decent amount of scattered activity around (esp Saturday). Assuming there's not a stronger vort/disturbance/forcing mechanism around, this looks mainly diurnally driven. The evening trick-or-treating forecast looks ok for most of the area at this point.

A more potent mid-upper trof digs swd into the scntl CONUS early next week. We may need to eventually keep an eye out for the potential for some strong storms in the vicinity late Monday or early Tue depending on how the finer details evolve. As this system passes, a cold frontal passage should quickly follow. 47

AVIATION

(18Z TAF Issuance) Issued at 1225 PM CDT Tue Oct 27 2026

Radar shows scattered showers mainly along and south of I-10. Some showers may produce very isolated heavier downpours, which could briefly reduce visibility. Shower activity looks to remain through the afternoon, tapering off this evening. ESE winds prevail and become light and variable overnight. Tomorrow morning, there is a chance for MVFR/IFR CIGS for the western portion of the region. CIGs lift back to VFR and winds pick up out of the ESE/SE late tomorrow morning.

MLG

MARINE

Issued at 1225 PM CDT Tue Oct 27 2026

A long easterly fetch situated across the northern Gulf will maintain 3 to 4 foot seas for much of the week. Some isolated to scattered showers and thunderstorms are possible at times as weak disturbances pass through. 47

PRELIMINARY POINT TEMPS/POPS

College Station (CLL) 63 83 64 84 / 0 30 10 10 Houston (IAH) 67 84 65 85 / 10 20 0 0 Galveston (GLS) 73 80 71 80 / 10 10 0 0

HGX WATCHES/WARNINGS/ADVISORIES

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