FXUS64 KHGX 261703 AFDHGX Area Forecast Discussion National Weather Service Houston/Galveston TX 1203 PM CDT Wed Aug 26 2026 ...New DISCUSSION, AVIATION, MARINE... .KEY MESSAGES... - Heat Advisory continues today. Continued hot and humid conditions are expected on Thursday, but increased cloud cover and rain chances has lowered the chance for Heat Advisory conditions. Regardless, continue to use heat safety practices. - Isolated showers and thunderstorms possible tonight with scattered activity expected Thursday into Friday morning. - Isolated showers and storms possible through the weekend. && .DISCUSSION... Issued at 1156 AM CDT Wed Aug 26 2026 Summer heat continues today as abundant sunshine will lead to afternoon temperatures reaching into the 100-103 degree range for most areas along and north of I-10 with areas closer to the coast remaining in the mid to upper 90s. High dew points will bring heat indices into the 107-110 degree range for most of the region today, thus the Heat Advisory remains in place today across the area. For the first time in awhile, we are looking at the potential for some late evening/overnight showers and thunderstorms to move into the area from the north. The dominate high pressure that has been over the region the past several days is beginning to shift a little further westward to the Four Corner region. This will bring northwesterly flow aloft over Texas with embedded disturbances moving through the flow. The first of these weak disturbances will push through tonight into Thursday bringing that chance showers and thunderstorms. As of right now, coverage looks to be fairly isolated tonight, and remaining mostly north of the I-10 Corridor - but, I wouldn't be shocked to see a more scattered coverage of storms after the past several days of heating and abundant moisture (PWATs nearing 2-2.2"). Expecting to see an increase in shower and thunderstorm coverage during the day on Thursday as daytime heating and passing vort maxes aid in storm development. Lingering shower and thunderstorm activity will be possible into Thursday night, especially along and south of I-10, but the bulk of the activity should push off the coast for Friday. While severe thunderstorms are not likely the next few days, any thunderstorm that develops could become strong, producing gusty winds and locally heavy rainfall. Additional isolated to scattered showers and thunderstorms will be possible over the weekend as a weak disturbance moves westward across the northern Gulf. Turning the focus back onto heat - tomorrow will be a tricky forecast for the need of a Heat Advisory as it will depend largely on amount of cloud cover and rainfall coverage. Less activity = more likely to need a Heat Advisory, more activity = less likely to need a Heat Advisory. Have opted to not put out a Heat Advisory for tomorrow at this time, but if forecast trends are for less shower/thunderstorm activity, then an Advisory may be issued during later shifts. Regardless, summer-time heat with temperatures in the 90s (and approaching 100 degrees in spots) means to continue to take precautions against heat-related illnesses: stay hydrated and take breaks if working outside. Temperatures will continue to slowly cool (though still hot) through the weekend with high temperatures generally in the mid 90s. Fowler && .AVIATION... (18Z TAF Issuance) Issued at 1156 AM CDT Wed Aug 26 2026 VFR prevails across the region at this hour with west-southwest winds around 10 kt. A scattered cumulus field around 4000 ft is expected to expand in area through the afternoon with winds becoming more southerly by mid afternoon. We'll be watching the potential for convection to approach from the north later tonight mainly in the form of showers and will have VCSH after midnight for CLL/CXO/UTS. Showers become more likely at IAH/HOU prior to sunrise and may be accompanied by TEMPO MVFR cigs but probs are a little low to include at this time. Of greater concern will be an increasing potential for TSRA Thursday afternoon as a weak disturbance approaches and convergence along a weak sea breeze develops late in the day. We'll include a PROB30 for TSRA from 21-00Z at IAH to account for this potential. Dunn && .MARINE... Issued at 1156 AM CDT Wed Aug 26 2026 South to southwesterly flow around 10-15kt will continue through Friday morning with light onshore flow then persisting through the weekend along with seas around 1-3ft. Winds in the early morning hours could be more west to north at times. There will be increasing chances for showers and thunderstorms over the coastal waters late Thursday into Friday with isolated chances continuing into this weekend. && .PRELIMINARY POINT TEMPS/POPS... College Station (CLL) 79 100 76 97 / 30 30 30 20 Houston (IAH) 81 100 79 96 / 20 30 40 30 Galveston (GLS) 84 92 82 91 / 10 20 40 40 && .HGX WATCHES/WARNINGS/ADVISORIES... TX...Heat Advisory until 7 PM CDT this evening for TXZ163-164-176>179- 195>200-210>214-226-227-235>238-300-313-335>338-436>439. GM...None. && $$ DISCUSSION...Fowler AVIATION...Dunn MARINE...Fowler