textproduct: Houston/Galveston

KEY MESSAGES

- Scattered showers and thunderstorms will continue to develop this afternoon. Brief heavy downpours, frequent lightning and gusty winds up to 35 mph are possible with the strongest storms through early this evening.

- Rain and storm chances continue each day. Precipitation should be diurnally driven...starting out offshore and near the coast late at night and in the mornings then transitioning inland during the day. - High temperatures will generally be in the low to mid 90s inland and the upper 80s to lower 90s along the coast. Peak heat indices 102 - 108F.

DISCUSSION

Issued at 152 PM CDT Wed Sep 9 2026

Scattered showers and thunderstorms continue to develop and move slowly inland this afternoon. Frequent lightning and brief heavy downpours are the primary risks with the strongest storms or training storms. Synoptically, an elongated ridge extends from the southern Rockies to the southeastern CONUS, while an inverted trough moves westward over the northwestern Gulf. Soundings and Blended TPW Satellite show deep tropical moisture (PWs 2.0 - 2.4 inches) remaining over the region. The combination of abundant moisture, the vicinity of the trough, and seabreeze interaction is responsible of producing these rain/storms over the area. Most of this activity is diurnally-driven; therefore, it should taper off near/after sunset.

The pattern aloft will not change much for the rest of the week and into the weekend. Ridge aloft continues to break down/flatten as a frontal boundary moves over northeast TX. Locally, significant changes in the forecast are not anticipated other than daily scattered showers and thunderstorms. This activity will develop over the coastal waters and along the islands late overnight/early morning, spreading farther inland throughout the day. Most of Southeast TX will see isolated to scattered activity popping up during the day, with the greatest chances of rain/storms remaining along and south of I-10. As is typical with weak low-lvl vorticity and tropical moisture, a few weak funnel clouds may be possible mainly in the mornings.

For early next week, a mid to upper lvl ridge centered over the southeastern CONUS will slowly expand westward into our region. This will result in a slightly drier airmass; however, southerly warm and humid surface flow will be enough to support isolated/scattered diurnally driven activity (chances of rain/storms 20 to 40 percent) each day, especially along the seabreeze.

AVIATION

(12Z TAF Issuance) Issued at 547 AM CDT Wed Sep 9 2026

Isolated to scattered showers have been present offshore and along the coast near LBX/GLS for most of the early morning hours. This sporadic coverage of coastal showers will continue through the morning, then will be followed by increasing coverage of showers/storms by the late morning into the afternoon with daytime heating and the seabreeze moving inland. There remains a little bit of uncertainty in the inland extent of the afternoon convection, but the general timing of 18Z-00Z remains consistent with what we have seen over the past few days. The southern terminals are on the earlier end of that window and vice versa. The highest confidence for convective impacts is generally near and south of the I-10 corridor. Outside of any storms, VFR conditions will prevail throughout the day with light easterly winds in the morning becoming southeasterly in the afternoon between 7-10 kt. Convection subsides after sunset and will be accompanied by a trend towards light and variable winds going into the overnight hours. A rinse and repeat pattern for Thursday, so anticipate another round of early morning showers again along the coast.

Batiste

MARINE

Issued at 152 PM CDT Wed Sep 9 2026

Light onshore winds and seas around 1 to 2ft will prevail this week and into the weekend. The main marine concerns will be a daily risk of scattered showers and thunderstorms, generally developing late night through mid/late morning over the coastal waters, before spreading farther inland through the day. Erratic winds, brief downpours, and lightning are possible near any strong storms. As we have been seeing today and over the past few days, weak, atmospheric conditions will continue to be favorable for weak waterspouts/funnel clouds early in the morning. If they do develop, they are typically weak, and short-lived.conditions develop near your area.

JM

PRELIMINARY POINT TEMPS/POPS

College Station (CLL) 98 75 97 75 / 20 20 20 20 Houston (IAH) 92 78 94 77 / 40 20 40 20 Galveston (GLS) 91 82 90 81 / 60 30 50 30

HGX WATCHES/WARNINGS/ADVISORIES

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