textproduct: Houston/Galveston

KEY MESSAGES

- Scattered afternoon showers and thunderstorms will be possible on a daily basis into next week.

- Heat and humidity continue with heat indicies in the triple digits each day.

DISCUSSION

Issued at 1234 AM CDT Fri Sep 4 2026

Upper level ridging will expand across the Southern Plains with a mid-level circulation meandering SW through the day Friday. PWAT values remain elevated, and as daytime heating kicks in with the approach of the sea breeze, expect to see more showers and thunderstorms developing over the course of the day. Nearby mid- level vorticity maximum, along with moderate instability and weak winds, will promote slow moving storms capable of producing heavy downpours and isolated gusty winds through the afternoon hours.

Expect this pattern of daily showers and storms to continue through the long-term period as a broad area of low pressure remains nearby and the ridge just to our north. This area of low pressure coupled with daytime heating and the afternoon sea breeze will promote afternoon showers and storms.

Look for highs to be in the low to mid 90s for inland areas and in the 80s along the coast. Daytime heat indices will reach into the triple digits.

Bailey

AVIATION

(12Z TAF Issuance) Issued at 555 AM CDT Fri Sep 4 2026

Isolated to scattered showers with some intermittent flashes of lightning currently ongoing across the region. The majority of the coverage remains west of I-45, but convection has been steadily developing near and east of GLS early this morning. Additionally, intermittent periods of reduced visibilities possible over the next few hours especially at CXO.

High-resolution model guidance depicts that convective coverage persists along and south of I-10 through the morning then expanding in the early to mid afternoon. PROB30's have been included for the most likely window for convective impacts. Winds remain light and generally southeasterly away from any storms. Keep in mind that gusty winds and reduced visibilities/ceilings are possible in and near any storms. Showers/storms dissipate after sunset this evening, then reignites along the coast and offshore early Saturday morning. There is potential again for reduced visibilities due to patchy fog.

Batiste

MARINE

Issued at 1234 AM CDT Fri Sep 4 2026

Light to moderate onshore winds and 2-3 ft seas will prevail through the end of the week and into the weekend. Isolated to scattered showers and thunderstorms are expected each day. Locally higher winds and seas will be possible near any strong storms.

JM/Bailey

PRELIMINARY POINT TEMPS/POPS

College Station (CLL) 94 74 93 74 / 40 0 40 10 Houston (IAH) 93 77 92 77 / 50 10 60 10 Galveston (GLS) 90 82 90 82 / 40 20 50 40

HGX WATCHES/WARNINGS/ADVISORIES

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