FXUS64 KHGX 220025 AFDHGX Area Forecast Discussion National Weather Service Houston/Galveston TX 725 PM CDT Sat Mar 21 2026 ...New AVIATION... .KEY MESSAGES... - A strong heat dome over the Southwest will keep conditions dry, with temperatures well above average through the weekend and persisting into next week. - Persistent southerly flow will lead to daily opportunities for fog and low clouds, at least through early next week. && .DISCUSSION... Issued at 200 PM CDT Sat Mar 21 2026 The primary weather stories for the weekend and the upcoming week remain centered on unseasonably warm temperatures, persistent dry conditions and periods of morning fog. A strong heat dome of high pressure centered over the southwestern CONUS and a surface high to our east continue to be the main drivers of our local weather. Well-above normal temperatures are on tap for the region this afternoon, with highs reaching the upper 80s to low 90 across our far western counties (Brazos Valley area). Persistent light southerly flow and low-level Gulf moisture will lead to another round of patchy-to-areas of fog and low to mid level clouds tonight into early Sunday. Some fog may be locally dense at times. With the ridge remaining firmly in place, Sunday is expected to be another hot and breezy day once the morning fog burns off. The southwestern CONUS ridge is expected to weaken slightly late Sunday into Monday. This is in response to a weak, dry cool front attempting to backdoor into the area while a mid-upper level low moves over the northwestern Gulf. No significant impacts are expected with the FROPA and/or upper-lvl low. Expect temperatures to drop perhaps a degree or two, with the only potential for rain being a few light showers well offshore.The aforementioned high pressure will strengthen and expand eastward. This will reinforce a pattern of dry, hot and humid conditions through the remainder of the forecast period. With southerly flow maintaining surface moisture, morning fog remains a recurring concern. Current model guidance suggests low probabilities for reduced visibility for tonight (15 to 20%), medium probabilities (25-45%) for early Monday. && .AVIATION... (00Z TAF Issuance) Issued at 709 PM CDT Sat Mar 21 2026 VFR conditions on going at all sites this evening. MVFR CIGs expected around 09Z for CXO and terminals south of CXO. Patchy fog also possible at southern terminals during the early morning hours. Winds will increase out of the SSW during the morning into the afternoon hours with gusts to around 24 knots. As winds increase, cloud cover will become more scattered with VFR levels returning by the afternoon. Winds expected to become light out of the south during the evening hours; however, occasional gusts to around 25 knots will be possible at IAH/HOU terminals. && .MARINE... Issued at 200 PM CDT Sat Mar 21 2026 Light to moderate onshore winds (SSW to SSE) winds will prevail this weekend and into the rest of the upcoming week. A weak upper-level disturbance will be moving across the northwestern Gulf early this week, as surface high pressure slightly shifts eastward into Florida. No significant impacts are expected with this low, other than a few light showers well-offshore on Monday. High pressure reestablishes again through the week, keeping the upper TX coast dry, with light to occasionally moderate winds and seas with from 2 to 4 ft. && .PRELIMINARY POINT TEMPS/POPS... College Station (CLL) 61 88 59 87 / 0 0 0 0 Houston (IAH) 64 87 63 87 / 0 0 0 0 Galveston (GLS) 66 75 66 76 / 0 0 0 0 && .HGX WATCHES/WARNINGS/ADVISORIES... TX...None. GM...None. && $$ DISCUSSION...JM AVIATION...Bailey MARINE...JM