


Area Forecast Discussion
Issued by NWS Portland, OR
Issued by NWS Portland, OR
313 FXUS66 KPQR 080306 AAA AFDPQR Area Forecast Discussion...UPDATE National Weather Service Portland OR 805 PM PDT Mon Jul 7 2025 Updated Aviation discussion .SYNOPSIS...High pressure lingers through Tuesday with an upper level low near northern California. Temperatures will be in the upper 80s to low 90s through Tuesday, but will quickly cool on Wednesday as the California low moves inland. Slight chance for showers on Wednesday in southwest Washington. Warmer temperatures return for the latter part of the week and into the weekend as a weak upper level ridging is expected to return. && .SHORT TERM...Tonight through Wednesday Night...High pressure continues to linger over the northeast Pacific which will keep conditions dry and warm through Tuesday. Today and Tuesday will be very similar as the overall pattern is not expected to change significantly until late Tuesday/early Wednesday. Daytime highs tomorrow are expected to be in the upper 80s to low 90s, upper 60s to low 70s along the coast and mid 70s to mid 80s for the Cascades. Overall, expect daytime highs tomorrow to be just a tad cooler than today. There remains a Moderate HeatRisk for the inland valleys including the Gorge and valleys within the Cascade Foothills through Tuesday. As Wednesday approaches, a pattern change is expected. Models have the California low starting to trek eastward running just south of the OR/CA border as it pushes towards eastern Oregon/Idaho. As this low moves eastward, the ridge also will get pushed eastward and a upper level trough starts to dive down from the eastern Pacific. This will bring much cooler and moister conditions. Daytime highs on Wednesday are expected to be in the upper 70s to low 80s inland, upper 50s to mid 60s along the coast and upper 60s to mid 70s in the Cascades. This trough also brings around a 20-40% chance of light showers to southwest Washington with most of northwest Oregon evading the rain. /42 .LONG TERM...Thursday through Sunday...As the latter part of the week and weekend approaches, models are starting to come into agreement that a warming and drying trend is expected to return. Now, while the exact pattern is still in flux, the results will be fairly similar. Expect a gradual warm up starting Thursday with Friday looking to be the warmest in this four day stretch and Saturday and Sunday looking very similar. Overall, no precipitation is expected through the long term period, but daytime highs will slowly warm up through the latter part of the week and into the weekend. /42 && .AVIATION...High pressure will maintain mostly clear skies with VFR conditions inland through Tuesday. Shallow marine stratus along the coast has already moved back into KONP with LIFR cigs and fog, where conditions are expected to persist through 18z Tue. IFR to LIFR stratus also likely to push back onshore at KAST with conditions quickly deteriorating after 06z Tue. Convective debris will be possible across southern portions of the forecast area from ongoing thunderstorms this evening across SW Oregon near KMFR. Onshore, northwest winds increase again Tue afternoon, but not expected to be as strong. PDX AND APPROACHES...VFR under mostly clear skies. Breezy northwest winds expected to diminish to around 05kt by 07z Tue. /DH && .MARINE...Very little change to the forecast with today`s update. A typical summertime pattern persists through much of the coming week as surface high pressure offshore maintains north to northwest winds across the coastal waters. Relatively strong pressure gradient at the coast due to diurnal heating, and elevated winds remain in place for all coastal waters through Monday night. Small Craft Advisories remain in effect through Monday evening as wind gusts increase a bit more to 25 to 30 kt Monday. Expect the strongest gusts south of Cape Falcon, while conditions will be more marginal to the north across the mouth of the Columbia River and the south Washington coastal waters. Seas will remain in the 4-6 ft range, comprised mainly of short period wind-driven waves and a modest, mid-period westerly swell. -TK/JLiu && .PQR WATCHES/WARNINGS/ADVISORIES... OR...None. WA...None. PZ...Small Craft Advisory until 10 PM PDT this evening for PZZ251>253- 271>273. && $$ www.weather.gov/portland Interact with us via social media: www.facebook.com/NWSPortland x.com/NWSPortland