FXUS66 KPQR 090454 AFDPQR Area Forecast Discussion National Weather Service Portland OR 954 PM PDT Thu May 8 2025 .UPDATED AVIATION DISCUSSION... && .SYNOPSIS...Benign weather conditions through the end of the week with temperatures warming into the 70s on Friday and Saturday for inland locations. Cooler and wetter weather likely returns Sunday into early next week. && .SHORT TERM...Now through Saturday night...Dry conditions with mostly clear skies throughout the region as we are currently in between major atmospheric features. Generally northerly winds today, with gusts peaking up to 15-20 mph for most of the region. Winds decrease going into the late afternoon/evening today, and will be fairly light and variable throughout tonight. Friday sees warmer conditions as broad ridging builds into the area. Generally dry conditions will persist as this ridging stays in the area for a few days. 60-80% confidence in max temperatures Friday afternoon to exceed 75 degrees throughout the Willamette Valley, with a 15-30% chance for just the Portland metro area to exceed 80 degrees. Friday night into Saturday, cloud cover begins to increase as the ridge begins pushing out of the region, resulting in slightly cooler temperatures Saturday closer to 70 in the lowlands. Westerly flow can also be expected on Saturday, with gusts to around 20 mph possible again. The next front pushes in late Saturday night, though most of the rainfall will arrive Sunday; 15-30% chance of some light rainfall Saturday afternoon and night, mostly over elevated terrain. /JLiu .LONG TERM...Sunday through Wednesday...Next front pushes fully into the region on Sunday, with rain throughout the day. NBM probabilities for 24 hour liquid precipitation exceeding 0.25 inch ending 5 AM Monday are around 40-70% along the coast and high terrain, and 20-40% for interior valleys. Will also note that this trough will advect more cold air aloft which may help create a more unstable atmosphere. NBM guidance currently pointing toward a 15-20% chance of scattered isolated thunderstorms on Sunday and Monday afternoons, with slightly better chance on Sunday. However, this will be heavily dependent on whether or not sufficient clearing in cloud cover occurs. Showery conditions remain in place through Wednesday as WPC Cluster guidance shows 80%+ agreement in Troughing continuing through at least Wednesday. /JLiu/Alviz && .AVIATION...VFR conditions over the region likely persist thanks to an area of high pressure overhead. That said, we'll need to watch for marine stratus development later overnight primarily impacting KONP with models indicating a 70-80% chance for MVFR conditions come 12-18z and 30-50% chance for IFR during this same period. Any marine stratus likely breaks up midday. Prevailing winds generally stay below 5 to 10 knots at all sites. PDX AND APPROACHES...VFR CIGS/VIS prevail with fairly light northwesterly winds. No other weather concerns. -Schuldt && .MARINE...High pressure rebuilds over the waters which will cause conditions to remain fairly stable over the next 24-48 hours. Winds will be northerly 10-15 kt with gusts up to 20 kt. Within the inner waters of PZZ252 and 253, gusts as high as 25 kt are possible. There is around a 20-40% chance of gusts exceeding 21 kt until 2000 local. Because of the short period of time and the lower probability, will refrain from issuing a small craft advisory. On Friday, conditions will be diurnally driven with gustier winds in the afternoon. Seas will be 5-7 ft at 10 seconds during this time. The next period of active weather will arrive late this weekend into early next week as a low pressure system moves into the northeast Pacific near Vancouver Island. Winds will increase with gusts up to 20 kt while seas remain generallyunaffected until Tuesday when a northwesterly swell pushes waves heights closer to 10 ft. -Batz/Muessle && .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