125 FXUS66 KPQR 062126 AFDPQR Area Forecast Discussion National Weather Service Portland OR 226 PM PDT Wed Aug 6 2025 .SYNOPSIS...Building high pressure will result in warm and dry conditions through early next week. Daytime highs will slowly climb towards the upper 80s for the coast and upper 90s for inland locations by Sunday. Monday is slated to be the hottest day for the forecast period with daytime highs for inland locations likely reaching into the triple digits. If this trend continues, hazardous heat should be expected and prepared for. && .SHORT TERM...Tonight through Friday Night...Light and showery precipitation will continue to dissipate through tonight. As the sun rises on Thursday, a broad area of high pressure will slowly start to deepen within the Eastern/northeastern Pacific. This will bring a return of hot and dry conditions to our CWA. Daytime highs on Thursday are expected to be in the 60s along the coast, mid 60s to mid 70s for the Cascades and upper 70s to upper 80s for the Willamette Valley. Friday expect daytime highs to be 3 to 5 degrees fahrenheit warmer as the Pacific High pressure spreads eastward. Overnight lows on Thursday (mid 40s to mid 50s) and Friday (mid 50s to upper 50s) will provide a bit of a reprieve from the daytime heat. However, the cool overnight temperatures will not linger around past Friday night. /42 .LONG TERM...Saturday through Tuesday...The major pattern shift continues over the weekend into next week. Temperatures continue to warm into the upper 80s and 90s with the potential for triple digit highs on Monday. This will result in hazardous heat Sunday and Monday. There is some good news as that models are showing a breakdown on the upper level high pressure as well as the system moving away from the western CONUS on Tuesday. Afternoon highs are likely (85-95% chance) to exceed 90 degrees across interior valleys both Sunday and Monday. Confidence remains very high that temperatures will peak on Monday, when some locations may see their first triple-digit temperature of the year, with 60-85% chances of reaching 100 degrees along the Willamette Valley. Dewpoints in the low to mid 60s will additionally make conditions feel noticeably humid each afternoon, while overnight temperatures may fail to fall below 60-65 degrees both Sunday and Monday nights, most likely across the northern and central Willamette Valley, the Lower Columbia and Cowlitz Valleys, the Portland/Vancouver Metro, and along the Columbia Gorge. This lack of sufficient overnight cooling can raise the cumulative heat stress and elevate the risk for heat illness, resulting in areas of Major HeatRisk. Residents of the aforementioned areas should therefore begin to plan for this period of hazardous heat. /42-Picard && .AVIATION...Complicated weather day as a stalled cooler front lingers over the Pacific Northwest. While much of the precipitation has ended, the stratus remains anchored inland. CIGs and VIS along the coast have fallen drastically compared to what earlier models were suggesting. Visibility around 1 SM with CIGs around 400 ft are present at almost all coastal runways. Inland, MVFR CIGs dominate though they are flirting right at that OVC030 level. Will continue to monitor, but with nighttime cooling, easily could see the lower atmosphere saturate out and CIGs lower. Winds are the only other real concern today. The coast has once again over-performed with gusts as high as 25 kt reported. However, these conditions do appear to be localized. As the front fully exits, winds will ease both inland and along the coast. With light northerly winds overnight near KEUG, one thing to watch is the potential for fog. This is a common pattern for patchy fog there so cannot rule it out. Ultimately it will come down to how much cloud cover lingers. PDX AND APPROACHES...MVFR through most of the next 24 hours with a period of lifting CIGs starting Thu afternoon. Winds will slowly transition to the northwest behind the front. There is a slight chance (10%) for thunderstorms on the east side of the terminal this evening, but given a lack of mixing, that would be incredibly difficult to achieve. -Muessle && .MARINE...Transitioning into the post-frontal stage of this system that brought rain and breezy winds along the inner waters. Currently, there are some reports of gusts up to 25 kt through land bound observation sites. These have yet to be observed directly along the coast or by area buoys. While those winds are possible, cannot rule out that it is a very localized feature. Thus, have not issued any Small Craft Advisories at this time. For those moving through the Columbia River Bar, note that wind gusts will be high at times. Seas remain settled at 6 ft 10 seconds over all of the observations. Seas of this magnitude are expected through at least Friday. Over the weekend, a ridge will build with a northerly wind reversal and conditions will take on a typical summer pattern. As temperatures warm considerably through the weekend, expects winds to ramp up with combined seas being dominated by the wind wave. High probability of Small Craft Advisory conditions starting Friday afternoon. -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