Area Forecast Discussion
Issued by NWS Houston/Galveston, TX
Issued by NWS Houston/Galveston, TX
693 FXUS64 KHGX 082347 AFDHGX Area Forecast Discussion National Weather Service Houston/Galveston TX 647 PM CDT Fri Aug 8 2025 ...New AVIATION... .KEY MESSAGES... Issued at 115 PM CDT Fri Aug 8 2025 - Hot and humid conditions are expected through at least early this weekend. Heat indices up to 107F are possible. Practice heat safety! - Chances for showers and storms, mainly along and south of the I-10 corridor will persist through into next week. Rain chances increase going into the weekend. && .DISCUSSION... Issued at 115 PM CDT Fri Aug 8 2025 Upper-level high pressure remains anchored to our west while a weak surface high pressure moves over southeast Texas. This pattern has brought even drier conditions today... clearly depicted in the latest water vapor and visible satellite imagery. Despite moderate to strong subsidence, warm and humid south to southeast surface winds will continue to advect more moisture across the coastal counties this afternoon. While coverage will be more limited, we can still expect isolated to scattered storms in areas generally along and south of the I-10 corridor this afternoon through sunset. As we have seen in the previous nights, a warm and muggy night is anticipated with patchy, low-lying fog possible early in the morning. As we head into the weekend, the aforementioned high sightly shifts westward, opening the door for more troughiness across our area. A mid-to-upper level shortwave trough is progged to develop along the TX coast and move northward into our region Saturday into early Monday. Sufficient forcing aloft, diurnal heating and surface convergence due to sea/bay breeze will support better rain and storm chances compared to what we have experienced over the past few days. It won`t be a complete washout, but coverage will be more scattered and even farther inland. This scenario will continue through most of the upcoming week with daily rain and storm chances (40 to 60 percent), especially in the afternoon. It will continue to be hot and humid over the next several days; however, with increasing cloud cover and rain chances, we may see highs dropping a few degrees. Highs will generally be in the low to mid 90s. Peak heat index values in the triple digits are expected each day with values close to 107F at times. Don`t forget to practice heat safety wherever you are. JM && .AVIATION... (00Z TAF Issuance) Issued at 642 PM CDT Fri Aug 8 2025 Remnant storm near/north of SGR is situated along an old nw moving outflow boundary. Can`t rule out another one or two cells popping up before sunset, but suspect any that do shouldn`t impact metro terminals who are already on the more stabilized backside of the outflow. Rest of the fcst remains the same as you`ve seen the past several days with mainly VFR conditions with the exception of some isolated late afternoon cells along the baybreeze/seabreeze/outflows from IAH southward. 47 && .MARINE... Issued at 115 PM CDT Fri Aug 8 2025 With the high pressure prevailing over the Gulf, light onshore winds and low seas will continue across the Upper TX coast. This pattern will continue to bring isolated to scattered showers with a few thunderstorms, mainly in the mornings. Rain and storm chances will gradually increase this weekend and into early next week as a mid- level disturbance moves through the region. Gusty winds and locally heavy downpours are possible near any strong storms. Winds will generally remain from the south-southeast in the next 7 days. Seas, on the other hand, will slightly increase up to 4-5 ft towards the end of the upcoming week as another disturbance moves through. JM && .PRELIMINARY POINT TEMPS/POPS... College Station (CLL) 76 97 74 96 / 0 10 0 20 Houston (IAH) 79 98 79 95 / 10 30 10 60 Galveston (GLS) 83 90 82 90 / 10 30 30 50 && .HGX WATCHES/WARNINGS/ADVISORIES... TX...None. GM...None. && $$ DISCUSSION...JM AVIATION...47 MARINE...JM