textproduct: Houston/Galveston

KEY MESSAGES

- Light showers/virga expected throughout the day on Monday, especially along and west of I-45.

- Chances for thunderstorms return Tuesday into Wednesday with the potential for another round of locally heavy rainfall.

- Gradual warming trend throughout the work week with shower/storm chances increasing again going into the weekend.

DISCUSSION

Issued at 256 PM CDT Mon Apr 20 2026

Light showers are continuing this afternoon. The bulk of the heaviest rainfall has remained to the west of our area. Expect continued cloudiness through the remainder of the week as disturbances impact SE Texas.

Tuesday and Wednesday will feature the wettest days of the week with PW values exceeding the 90th percentile (~1.58"). This will contribute to the potential for locally heavy rainfall. WPC has outlined most of SE Texas in a marginal risk (level 1 of 4) of excessive rainfall Tuesday and Wednesday. With soils already saturated from previous rainfall, it would not take too much rainfall for runoff to occur. Current QPF show generally 1-2"; however, locally higher amounts of 3+ inches will be possible.

There will be a decrease in moisture availability on Thursday, but with embedded shortwaves passing overhead, may have enough to see isolated to scattered activity during peak heating.

Temperature wise, expect a warm up trend to begin tomorrow and continue through the end of the weekend. Highs will return to the mid to upper 80s by the end of the week.

Another shot of rain will be possible this weekend as another upper- level low moves across the Plains and another frontal boundary approaches the area.

Bailey

AVIATION

(12Z TAF Issuance) Issued at 614 AM CDT Mon Apr 20 2026

VFR conditions are expected through the next 12-18 hours. Cigs will gradually lower through the day as moisture increases, but so categorical degradations are expected. Chances for SHRA will increase from SW to NE this afternoon into tonight. TSRA probs are low enough to keep mention out of the TAFs this cycle, but will continue to be monitored for tonight heading into Tuesday. Winds will generally remain out of the east around 6-12 kt, except GLS where gusts of 20-25 kt remain possible.

Young

MARINE

Issued at 256 PM CDT Mon Apr 20 2026

Small craft will need to exercise caution through at least tonight. Winds and seas are expected to take a while to subside below the caution flag threshold. Wind speeds remain elevated, but will gradually transition to easterly overnight and southeasterly by tonight. An extended fetch of moderate southeasterly winds around midweek will likely lead to another round of increased seas, especially in the offshore Gulf waters. This may lead to another period of caution flags on Wednesday into Thursday for the Gulf waters. Scattered light rain is expected on Monday, but chances for storms return Tuesday into Wednesday as an upper level disturbance pushes through. Water levels are expected to remain near 3.0 feet above Mean Lower Low Water during high tide cycles through at least midweek.

PRELIMINARY POINT TEMPS/POPS

College Station (CLL) 58 67 61 80 / 70 80 40 60 Houston (IAH) 62 71 65 79 / 50 80 50 80 Galveston (GLS) 69 76 72 78 / 50 60 60 80

HGX WATCHES/WARNINGS/ADVISORIES

TX...High Rip Current Risk through late Tuesday night for TXZ436>439.

GM...Small Craft Should Exercise Caution until 1 AM CDT Tuesday for GMZ330-335-350-355-370-375.