Cape Shoalwater WA to Cascade Head OR from 10 to 60 NM Marine Forecast
| Rest Of Today...S Wind 5 Kt. Wind Waves S 1 Ft At 4 Seconds. Nw Swell 2 Ft At 9 Seconds. Widespread Dense Fog And A Chance Of Showers In The Morning, Then Areas Of Dense Fog In The Afternoon. |
| Tonight...N Wind 5 Kt. Wind Waves N 1 Ft At 4 Seconds. Nw Swell 2 Ft At 9 Seconds. Areas Of Dense Fog In The Evening. Patchy Dense Fog After Midnight. |
| Wed...Ne Wind 5 Kt. Wind Waves Ne 1 Ft At 4 Seconds. Nw Swell 3 Ft At 9 Seconds. Patchy Dense Fog In The Morning. |
| Wed Night...Ne Wind 5 Kt. Wind Waves Ne 1 Ft At 4 Seconds. Nw Swell 3 Ft At 9 Seconds. |
| Thu...Se Wind 5 Kt. Wind Waves Se 2 Ft At 4 Seconds. Nw Swell 3 Ft At 10 Seconds. |
| Thu Night...Nw Wind 5 To 10 Kt. Wind Waves Nw 2 Ft At 4 Seconds. Nw Swell 3 Ft At 10 Seconds. |
| Fri...Nw 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 ...UPDATED National Weather Service Portland OR 438am PDT Wednesday August 19 2026 ...Updated aviation discussion... Synopsis Warm and dry conditions through Thursday. Low pressure will return cooler temperatures and chances for showers Friday into Saturday, with a 5-10% chance for thunderstorms. Winds out of the north/northwest through Thursday, shifting to the west/southwest on Friday. Seasonable weather continues Sunday into early next week. Today through Tuesday...Dry and warm weather continues today and tomorrow as an upper-level ridge amplifies over the Rockies and Great Basin. Expect high temperatures near or slightly above average for this time of year, with mid 80s this afternoon across inland valleys and 60s along the coast. Highs for inland valleys increase slightly into the upper 80s as the upper ridge reaches its peak strength. Onshore flow continues as broad upper-level troughing sits over the northeast Pacific with light winds from the north/northwest. On Friday, the aforementioned trough over the northeast Pacific will progress toward the Pacific Northwest, bringing slightly cooler temperatures, increased cloud cover, and a 20-30% chance for showers in the afternoon and evening. Will note that this upper-level pattern on Friday looks like a typical set-up for thunderstorm chances, at least over the Cascades. Southerly flow aloft will bring increased moisture and instability into the mid-levels of the atmosphere (5-10 kft). Vorticity from the upper-level trough will also provide the necessary forcing for convection. Currently, NBM guidance shows low chances (5-10%) for thunderstorms on Friday, however, in the past we've seen models struggle with capturing the potential for high-based thunderstorms. There is also uncertainty among deterministic/ensemble guidance with how much instability (SBCAPE/MUCAPE) there will be, however, we will continue to evaluate the thunderstorm threat today. Those with outdoor plans on Friday should monitor the forecast closely these next couple days. By Saturday, ensemble guidance shows the upper-level trough moving into the Pacific Northwest with chances for showers continuing through the morning. As the associated surface front moves through, will see winds shift and come out of the west/southwest. The strongest winds are expected through the Central Columbia River Gorge and Hood River Valley where winds could gust to 25-35 mph. There is also a 30-60% chance for at least isolated gusts exceeding 40 mph for these areas, especially for higher terrain and exposed ridgetops. Late this weekend into early next week, the trough weakens and most ensemble members suggest a return of zonal flow before another upper-level trough drops down from the Gulf of Alaska and approaches British Columbia. At this point, there still remains high uncertainty with the exact magnitude and placement of the trough next week. However, this would suggest that onshore flow continues across the region resulting in seasonable temperatures for late August. -10 Marine High pressure will continue to support northerly winds across the waters through Thursday with gusts remaining below 20 kt. Friday to Saturday, weak low pressure moving over the northeast Pacific will shift winds out of the south to southwest across the waters. As the surface front moves through Saturday morning, there will be a 40-50% chance for maximum wind gusts up to 25 kt for the inner waters north of Cape Falcon, including the Columbia River Bar. For the rest of the waters, chances are around 5-10%. High pressure and northerly winds return by Sunday with a 50-60% chance for northerly wind gusts exceeding 21 kts in the afternoon and evening hours south of Cape Foulweather. Seas of 4-6 ft persist through the period. Periods around 12 sec today may result in a moderate risk for sneaker waves along the coast. Caution should be used when in or near the water. -10 NOAA Portland OR Office: Watches - Warnings - Advisories OR...None. WA...None. PZ...None. |
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