FXUS64 KHGX 192313 AFDHGX Area Forecast Discussion National Weather Service Houston/Galveston TX 613 PM CDT Wed Aug 19 2026 ...New AVIATION... .KEY MESSAGES... - Heat Advisory is in effect Thursday and Friday for heat index values peaking between 106-110F. The advisory may need to be extended into the weekend. - Rain chances will be very low through Friday, but might need to keep an eye out for some isolated-scattered activity near the Piney Woods Friday evening. - No substantial changes to the weather pattern through most of next week...so the August heat continues will mainly dry conditions. && .DISCUSSION... Issued at 100 PM CDT Wed Aug 19 2026 Forecast looks to be one of mostly persistence for the next 7-10 days with the August heat continuing. Mid-upper ridging centered around the Four Corners region will slowly expand further esewd into the Southern Plains and Texas into the weekend and early next week keeping things hot and mainly dry. Until further notice, daytime highs will be in the 99-102F range inland and lower 90s at the beaches. Not a whole lot of relief is expected at night with lows in the upper 70s to mid 80s. Guidance is indicating a slight uptick in low level moisture Thursday and Friday and dewpoints might not be as prone to mix out quite as much, or as early, as they have in previous days. As such, higher heat indices are anticipated and have gone ahead and issued a Heat Advisory for Thursday & Friday...then re-evaluate things for possible extensions into the weekend. Peak heat index readings should generally be between 106-110F. In terms of rainfall, the vast majority of the region should remain dry. Cannot rule out an isolated short-lived shower or two, but with one exception, chances are probably low enough to exclude the mention. That one exception (and probably best possibility in the next week) might be around the Piney Woods region Friday evening as some upper impulses in the N/NE flow aloft sag closer to the area and potentially generate some scattered storms (assuming subsidence can be overcome). Any lingering outflows on Saturday may assist in some isolated activity. There continues to be a mix of guidance showing that possibility, while others aren't as bullish. 47 && .AVIATION... (00Z TAF Issuance) Issued at 558 PM CDT Wed Aug 19 2026 Rinse and repeat set of TAFs for this 00Z update. VFR conditions prevail with 7-12 kt winds out of the SSW. Winds weaken and turn more WSW during the overnight period, then once again increase return to the SSW by tomorrow afternoon. Gusts of 15-20 kts are possible tomorrow afternoon and evening, similar to what has occurred for the last few days. Early tomorrow morning, inland sites may experience some brief MVFR CIGs between 09Z and 13Z. The forecast remains hot and dry and VFR conditions are expected for the rest of the day tomorrow. MLG && .MARINE... Issued at 100 PM CDT Wed Aug 19 2026 Southwest to south winds 10-15 knots will persist, with some intermittent higher gusts in the bays in the afternoon/evening hours and in the open Gulf waters at night. Seas should be in the 2 to 3 foot range through the weekend. 47 && .PRELIMINARY POINT TEMPS/POPS... College Station (CLL) 77 102 78 102 / 0 0 0 0 Houston (IAH) 79 100 80 101 / 0 0 0 0 Galveston (GLS) 84 91 83 91 / 0 0 0 0 && .HGX WATCHES/WARNINGS/ADVISORIES... TX...Heat Advisory from noon Thursday to 7 PM CDT Friday for TXZ163- 164-176>179-195>200-210>214-226-227-235>238-300-313-335>338- 436>439. GM...None. && $$ DISCUSSION...47 AVIATION...MLG MARINE...47