189 FXUS66 KPQR 251814 AFDPQR Area Forecast Discussion National Weather Service Portland OR 1114 AM PDT Fri Jul 25 2025 .UPDATED AVIATION DISCUSSION. .SYNOPSIS... More seasonal temps expected today through Sunday as onshore flow is enhanced by increased upper level troughing. Another warm up is expected early to mid next week, with thunderstorms looking possible along the Cascades. && .SHORT TERM...Now through Sunday Night... Now through Sunday Night...Little change in sensible weather across the area this morning as satellite imagery once again shows marine stratus entrenched over coastal areas and making progress into the Coast Range gaps and interior valleys of southwest Washington as of 3 AM Friday. Observational trends and latest hi-res guidance suggest cloud cover will fill into the Willamette Valley and from both the north and south around daybreak, yielding a cloudier start to the day today. In the upper levels, large scale troughing over western Canada will begin to sag southward into the region today, with gradual 500 mb height falls and decreasing 850 mb temps corresponding to more seasonable highs in the upper 70s to low 80s in the interior valleys this afternoon. Expect more of the same through the weekend as upper level troughing and onshore flow maintain temperatures near seasonal norms, with a deeper marine layer contributing to nightly stratus intrusions into the interior valleys. /CB .LONG TERM...Monday through Thursday...Monday will kick off another stretch of warmer weather as ensemble clusters show good agreement on high pressure rebuilding over the western CONUS. This will send inland high temperatures back towards 90 degrees during the first half of next week. Although hotter temperatures are expected, the potential for more significant heat related concerns remains relatively low at this time as the probability to reach 95 degrees generally stays below 20% and HeatRisk remains mainly in the minor category through the period. The other concern for next week will be thunderstorm potential as guidance continues to depict a deep upper level trough setting up over the NE Pacific and establishing southerly flow over the Pacific Northwest, helping to draw rich mid level moisture into the region. NBM guidance has started to catch onto this scenario, depicting chance to slight chance PoPs along the Cascades from Tuesday into Thursday of next week. Opted to introduce a chance of thunderstorms to match those PoPs given the potentially favorable synoptic setup. Will continue to closely monitor thunderstorm potential for next week in the coming days. /CB && .AVIATION...Late this morning satellite shows marine stratus rapidly dissipating across the region with most sites now experiencing VFR conditions. That said, it will take a bit longer for KAST to clear out midday into the afternoon hours. Expect yet another surge of marine stratus tonight knocking coast sites back down to MVFR. We`ll have to watch low clouds around the Portland Metro and KEUG in the 12-16z timeframe Saturday morning with the highest confidence for a drop in categories at KTTD, much lower confidence KPDX. Winds stay fairly light, generally less than 10 knots. PDX AND APPROACHES...MVFR CIGs have cleared with VFR conditions persisting the rest of the daytime and evening hours. Models indicate around a 30-40% chance for the return of MVFR CIGs 12-16z Saturday morning - a period we`ll have to watch closely. More than likely the low clouds remain locked just to the north and east of the terminal. -Schuldt && .MARINE...Going through the end of the work week through the weekend high pressure will maintain north to northwesterly winds with gusts around 13-18 knots during the afternoon/evening hours each day. Background swells don`t look particularly noteworthy so seas likely remain around 3-6 ft each day into next week. Small Craft advisory conditions are unlikely this week. There will be some strong ebb currents through the Columbia River bar this morning and Saturday morning, which may lead to locally choppy seas. ~Hall/Schuldt && .PQR WATCHES/WARNINGS/ADVISORIES... OR...None. WA...None. PZ...None. && $$ www.weather.gov/portland Interact with us via social media: www.facebook.com/NWSPortland x.com/NWSPortland