FXUS64 KHGX 231140 AFDHGX Area Forecast Discussion National Weather Service Houston/Galveston TX 640 AM CDT Sun Aug 23 2026 ...New AVIATION... .KEY MESSAGES... - Heat Advisory remains in effect. Hot conditions will persist through at least mid-week. - Cannot rule out a rouge shower or thunderstorm at times into midweek, but chances will be quite low. - Temperatures VERY slightly ease late in the week along with the potential for some isolated rain chances. && .DISCUSSION... Issued at 1151 PM CDT Sat Aug 22 2026 The oppressive heat wave continues across the region as strong mid to upper level ridge over the Southern Rockies/West Texas stays in place through at least Wednesday. Subsidence aloft, along with warm and humid south to southwest surface winds will keep conditions hot and sticky. Forecast models remain consistent in placing 850 mb temperatures in the 22-26 degC range today through midweek, which translates to surface highs reaching the upper 90s to lo 100s. Expect highs mostly in the triple digits inland and in the mid 90s along the coast through Wednesday/Thursday. A Heat Advisory remains in effect today and is now in effect through Monday evening. Given the persistent warmth and humidity, the Advisory will likely need to be extended through at least Wednesday. In terms of PoPs, the overall trend remains predominantly dry due to strong subsidence remaining in place. However, don't be entirely surprised if isolated showers or storms manage to develop during the afternoon hours as weak, subtle shortwaves ride along the southeastern fringe of the ridge. If any rain/storms do develop, they should dissipate around or shortly after sunset with the loss of daytime heating. For those looking for relief from the heat, options remain limited. :( BUT temperatures should drop by a few degrees toward the end of the week. As the ridge aloft gradually shifts westward Thursday into the upcoming weekend, highs will ease slightly into the mid to upper 90s. Additionally, slightly weaker heights and an approaching backdoor front will bring at least a slight rain/storm chances late in the week. JM && .AVIATION... (12Z TAF Issuance) Issued at 630 AM CDT Sun Aug 23 2026 Mostly VFR conditions expected throughout the TAF period. Winds will be SSW at around 5kts this morning, becoming SSE at 5-10kts in the afternoon and evening. There is a slight chance for showers/storms, mainly over the Piney Woods region, but will keep an eye on these in case they move more southward than expected. Stronger gusty winds can be expected in and around these storms. Winds will relax again to 5kts or less Sun night into Mon morning. Cotto && .MARINE... Issued at 1151 PM CDT Sat Aug 22 2026 Surface high pressure centered over the western Gulf will continue to result in light to moderate south to southwest winds and seas around 1 to 3 ft. Expect winds shifting to the southwest and west late at night and in the mornings, transitioning generally to the south in the afternoon and evening with the seabreeze. JM && .PRELIMINARY POINT TEMPS/POPS... College Station (CLL) 104 78 103 77 / 10 0 0 0 Houston (IAH) 103 80 102 80 / 10 0 0 0 Galveston (GLS) 92 83 92 84 / 0 0 0 0 && .HGX WATCHES/WARNINGS/ADVISORIES... TX...Heat Advisory until 7 PM CDT Monday for TXZ163-164-176>179- 195>200-210>214-226-227-235>238-300-313-335>338-436>439. GM...None. && $$ DISCUSSION...47 AVIATION...Cotto MARINE...47