Cascade Head to Florence OR from 10 to 60 NM Marine Forecast
| Rest Of Today...S Wind To 5 Kt. Wind Waves S 1 Ft At 4 Seconds. Nw Swell 3 Ft At 9 Seconds. Widespread Dense Fog In The Morning. Areas Of Dense Fog In The Afternoon. |
| Tonight...N Wind To 5 Kt. Wind Waves N 1 Ft At 4 Seconds. Nw Swell 3 Ft At 9 Seconds. Areas Of Dense Fog In The Evening. Patchy Dense Fog After Midnight. |
| Wed...Ne Wind 5 Kt, Backing To Nw To 5 Kt In The Afternoon. Wind Waves Ne 1 Ft At 4 Seconds, Shifting To The Nw At 4 Seconds In The Afternoon. Nw Swell 3 Ft At 9 Seconds. Patchy Dense Fog In The Morning. |
| Wed Night...Nw Wind 5 Kt, Backing To Se After Midnight. Wind Waves Nw 1 Ft At 4 Seconds, Shifting To The Se At 4 Seconds After Midnight. Nw Swell 3 Ft At 9 Seconds. |
| Thu...S Wind 5 Kt. Wind Waves S 1 Ft At 4 Seconds. Nw Swell 3 Ft At 10 Seconds. |
| Thu Night...N Wind 5 To 10 Kt. Wind Waves N 2 Ft At 4 Seconds. Nw Swell 3 Ft At 10 Seconds. |
| Fri...N Wind 5 To 10 Kt. Wind Waves 2 Ft. Nw Swell 4 Ft. |
| Sat...Nw Wind 5 To 10 Kt. Wind Waves 2 Ft. Nw Swell 4 Ft. |
| Area Forecast Discussion National Weather Service Portland OR 937pm PDT Sunday August 30 2026 Updated aviation discussion. Synopsis High pressure will result in dry and warm conditions across the area today and Monday. A significant pattern change begins on Tuesday with a return of cooler temperatures, rain, and breezy southerly winds through the end of the week. Wednesday and Thursday are expected to be the wettest days with also a 10-20% chance for thunderstorms. Conditions trend slightly drier over the weekend, but there remains chances for lingering showers. .SHORT TERM...Today through Tuesday Night...Satellite imagery and surface observations as of late Sunday morning depicts mostly sunny skies across the area with some scattered clouds across southwest Washington and far northwest Oregon. Will maintain dry and warm conditions today and Monday as shortwave ridging sets up over the Pacific Northwest. Expect afternoon highs in the mid to upper 70s today across interior valleys, and 60s along the coast. Tomorrow will be the warmest day of the week as the ridge reaches its peak amplitude, with highs warming up into the mid 80s across interior valleys. This dry and warm weather will be short-lived as we head into a significant pattern change beginning Tuesday. Monday night into Tuesday, the aforementioned ridge will weaken and get pushed eastward as the first of two upper-level troughs drops down from the Gulf of Alaska. This trough will track towards southern Oregon and northern California, bringing increased cloud cover and a 25-50% chance for light showers. This will support cooler temperatures across interior valleys, with Tuesday afternoon highs falling into the low to mid 70s. Winds will also begin to turn out of the west/southwest, generally remaining light with gusts below 20 mph. An exception would be the Columbia River Gorge and Hood River Valley, where westerly gap winds Tuesday afternoon could gust to 25-35 mph with a 30-50% chance for maximum gusts exceeding 40 mph. -10 Long Term Wednesday through Saturday...Wednesday into Thursday will be the more significant soaker days as the majority of ensemble members are showing a second, much deeper upper-level trough dropping down into the Pacific Northwest. The associated surface front swings through on Wednesday, bringing widespread rain, cooler temperatures, and breezy winds from the south. In addition, there will be a 10-20% chance for thunderstorms. Chances for exceeding 1 inch of rain in 48 hours between 5am Wednesday to 5am Friday are high (70-90%) across northwest Oregon and southwest Washington, with the highest chances along the coast, Coast Range, and Cascades. Chances for exceeding 2 inches during this same timeframe are around 30-50% for these higher terrain features, and 5-15% along the I-5 corridor. Orographic enhancement will play a big role with providing higher rainfall amounts to the mountains. Thursday afternoon to Saturday, the upper-level trough remains over the Pacific Northwest and we transition into a post-frontal environment with lingering showers. Given that there will be cooler air aloft, this will favor increasing atmospheric instability and thus chances for thunderstorms. There will be another 10-20% chance for thunderstorms on Thursday following the initial frontal passage. Any passing thunderstorms may produce lightning, heavy rain, erratic winds, and small hail. Overall, while the upcoming rain will not quite yet be a "fire season ender," it will definitely slow down fire season and help put a damper on ongoing wildfires. -10 Marine Transient ridging over the Northeast Pacific will see northerly to northwesterly winds continue into Tuesday morning. Thermal troughing along the coast will yield strengthening near- shore winds Monday afternoon, reaching 15-20 kt with gusts to 25 kt within 10-20 NM north of Cape Falcon and including the Columbia River Bar, where a Small Craft Advisory has been hoisted from 2pm to 8pm PDT Monday afternoon and evening. Largely wind-driven seas will persist at 4-6 ft during this period. On Tuesday, winds back out of the south-southwest as a broad pattern shift sees troughing develop over the Northeast Pacific while ridging moves inland. By Wednesday, a robust frontal system will traverse the coastal waters of OR/WA. Southerly winds ahead of the frontal passage are likely (50-75% chance) to yield at least intermittent gale-force gusts. Sustained winds are less likely (30-60% chance) to reach gale- force, with higher chances generally to the north and closer to shore. Gale Watches may be needed if confidence persists in the duration of potential gusty winds across enough of the coastal waters. These strong winds will also see seas build to 8-12 ft, with chances for significant wave heigheights to reach 15 ft remaining less than 10%. Behind this system, winds and seas should ease from late in the week into next weekend. -36 NOAA Portland OR Office: Watches - Warnings - Advisories OR...None. WA...None. PZ...Small Craft Advisory from 2pm to 8pm PDT Monday for PZZ210- 251. |
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