textproduct: Houston/Galveston

KEY MESSAGES

- Scatter to Widespread showers/storms early this week. Slight Risk (level 2 of 4) of Excessive Rainfall Tuesday through Thursday. Ponding on roadways and street flooding will be possible.

- Hot weather returns during the second half of the week with highs in the upper 80s/90s and heat indicies in the 90s/triple digits.

DISCUSSION

Issued at 1134 PM CDT Mon Jul 13 2026

Starting to see a few showers pop up along the coastal areas where ample moisture and a pocket of deep moisture convergence reside. Expect this activity to increase in coverage as the early morning hours progress and continue through late morning/early afternoon. Models currently have activity winding down as the afternoon progresses, likely as the atmosphere becomes worked over from the morning showers and storms.

With PWAT values still in the 2.0" range, low pressure overhead, and vorticity maxima sweeping through, expect some of these showers and storms to produce locally heavy downpours. Once again, SE Texas is in a slight risk (level 2 of 4) for excessive rainfall per WPC. This will be the case for most of SE Texas Wednesday and Thursday as well.

Rainfall totals through tomorrow night will be in the 1-3" range once again; however, storms with heavier downpours could bring isolated totals of around 3-7". Ponding on roadways and street flooding could occur, especially in urban areas and low-lying areas with pour drainage. Remember, turn around, don't drown!

Rain chances taper off Thursday as ridging builds in overhead. Conditions will gradually heat up going into the weekend with highs in the upper 80s/90s. Consequently, the combination of heat and residual moisture will result in heat indices in the upper 90s and triple digits as we get into the weekend. While most of the area will remain dry during the latter part of the week, we could see some showers and storms pop up along the afternoon sea breeze as well as streamer showers during the overnight into early morning hours.

Bailey

AVIATION

(00Z TAF Issuance) Issued at 602 PM CDT Mon Jul 13 2026

Lingering showers with a couple of isolated thunderstorms continue to prevail around the region, but expect activity to gradually dissipate over the next few hours with a dry period expected late this evening into early Tuesday morning. MVFR to IFR ceilings are anticipated to develop over terminals north of and including IAH. This coincides with the onset of developing showers early Tuesday morning. Additional convection is expected to develop around sunrise and is expected to be scattered to widespread. The TEMPOs cover the highest confidence window for convective impacts, but impacts are likely to persist into the early afternoon hours. Reduced ceilings/visibilities and gusty winds will be possible in any of the stronger storms. Convective activity is expected to subside in the mid to late afternoon with widespread VFR conditions returning across the region. Winds will be light and variable overnight then becoming light and easterly to southeasterly in the daytime hours. Wind speeds generally remain less than 10 kt outside of any storms.

Batiste/Wingo

MARINE

Issued at 1134 PM CDT Mon Jul 13 2026

S to SE winds around 10 to 15 knots and seas of 2 to 4 feet are expected throughout the week. Multiple rounds of showers and thunderstorms are expected through mid-week. Some occasional strong storms could produce locally higher winds, seas and reduced visibility from heavy rainfall. Rain chances decrease Wednesday and taper off into Thursday, though isolated streamer showers will remain possible during the overnight and early morning hours.

Bailey

PRELIMINARY POINT TEMPS/POPS

College Station (CLL) 73 83 72 86 / 70 90 20 70 Houston (IAH) 74 83 75 88 / 70 100 10 70 Galveston (GLS) 80 88 83 89 / 60 90 20 40

HGX WATCHES/WARNINGS/ADVISORIES

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