Marine Weather Net

Cape Flattery to Cape Shoalwater WA between 60 and 150 NM Offshore Forecast


10 - 15


15 - 25


15 - 25


20 - 30

The Marine Weather Forecast In Detail:
PZZ800 Forecast Issued: 747 AM PDT Fri Sep 29 2023

Today...N Winds 10 To 15 Kt, Becoming 10 To 20 Kt. Seas 5 To 6 Ft.
Tonight...N Winds 15 To 25 Kt. Seas 5 To 9 Ft.
Sat...N To Nw Winds 15 To 25 Kt. Seas 8 To 10 Ft.
Sat Night...Nw Winds 20 To 30 Kt. Seas 8 To 10 Ft.
Sun...N To Nw Winds 10 To 20 Kt, Becoming Nw 5 To 15 Kt. Seas 5 To 9 Ft.
Sun Night...W Winds 5 To 15 Kt. Seas 3 To 6 Ft.
Mon...Nw Winds 10 To 15 Kt. Seas 4 To 8 Ft.
Mon Night...Nw Winds 10 To 15 Kt. Seas 7 To 10 Ft.
Tue...W Winds 5 To 10 Kt, Becoming Sw. Seas 8 To 9 Ft.
Tue Night...Variable Winds Less Than 10 Kt, Becoming W To Nw. Seas 7 To 8 Ft.
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Area Forecast Discussion
National Weather Service Seattle WA
910am PDT Fri September 29 2023

Only major update is dense fog concerns this morning in and around Everett, and the East Puget Sound Lowlands. Visibilities had dropped to a quarter of a mile due to dense fog. A dense fog advisory was issued in areas where visibilities had dropped to a quarter of a mile or less through 11am PDT (18Z). Otherwise as temperatures climb the fog will dissipate late this morning, and skies will clear out for the remainder of the afternoon. The weekend will remain dry, with the next best chance of precipitation arriving Monday into Tuesday.


High pressure will build into Western Washington today and through the weekend. This will result in clearing skies, warming temperatures and the prospect for some patches of overnight and morning fog. Active weather returns for the first half of next week as a series of systems will bring a chance for rain.

Short Term - Today through Sunday
Current satellite paints an interesting portrait...where points from Seattle south are clouded in, then there is a gap before a thin wisp of clouds hovers over southern Snohomish county impacting Paine Field, but from there north, mostly clear skies with some light fog. Radar certainly supports low cloud presence given the noise in place. Those looking for any precipitation will need to turn their eyes to northern OR.

This dry trend will continue as upper level ridging gradually shifts eastward over the Pacific to become the main influence on local weather for the short term period. This will provide a break in the rain and allow for daytime temperatures to gradually rise each day. Highs today will range from the upper 50s to lower 60s. Saturday sees a slight boost into the lower to mid 60s before temps peak on Sunday, ranging from the lower to upper 60s.

Clear skies overnight will be in the offing, especially tonight and Saturday night, which may result some patches of lowland fog, especially in the favored areas of the East Puget Sound Lowlands and in and around Olympia and the northern Chehalis valley. Any fog that does develop should burn off by mid to late morning. 18

Long Term - Monday Through Thursday
A series of weak impulses riding down the leading edge of a strong Pacific ridge will allow rain to return to the area starting early Monday morning. Operational deterministic models are split on how quickly the first system departs, the GFS (Global Forecast System) favoring a hasty exit while the ECMWF (European Centre for Medium-Range Weather Forecasts) has it linger into Tuesday. Ensembles are trending more toward the Euro solution and as such this is what is reflected in the forecast. Another fairly unimpressive system enters the area Wednesday morning as per the Euro while the GFS shifts the aforementioned Pacific ridge inland. Ensembles suggest this latter solution is a bit premature, once again siding with the Euro, however none of these wetter solutions are terribly impressed with both the chances for precipitation nor the amounts that would be generated. That being said, while the initial Monday/Tuesday system will have Probability of Precipitation ranging from Chance to Likely, Wednesday sits on the lower end of things, ranging from Slight Chance to low-end Chance. Given the consensus between the Euro and the ensemble output, feel comfortable leaving this forecast trend in place.

Deterministic and ensemble models converge on an upper level ridge setting up shop over the area Thursday, bringing a return to dry conditions and the prospect of another warming trend. 18

Surface low pressure will move onshore of the southern Oregon Coast this morning. Surface high pressure will build eastward in its wake across the eastern Pacific, increasing northerly flow over the area waters with the developing pressure gradient. Steep seas may also develop with a rather short period and fresh swell developing thanks to increasing northerly flow over the coastal waters. Small Craft Advisories have been issued for the offshore waters for Friday night through late Saturday night mostly for winds but also the potential for steep seas Saturday into Saturday night as wave heigheights approach 7-9 ft. There is some potential for advisory-level winds to spill southward from the Strait of Georgia Friday night through Saturday afternoon.

Fairly benign marine conditions into next week with a cold front attempting to sag southward into the area waters early next week but upper-level ridging looks to stall the front mostly north of the waters for now.


No river flooding is expected over the next 7 days.

NOAA Seattle WA Office: Watches - Warnings - Advisories
WA...Dense Fog Advisory until 11am PDT this morning for East Puget Sound Lowlands-Everett and Vicinity.

PZ...Small Craft Advisory from 8pm this evening to 5am PDT Sunday for
Coastal Waters From Cape Flattery To James Island 10 To 60 Nm-
Coastal Waters From James Island To Point Grenville 10 To 60 Nm-
Coastal Waters From Point Grenville To Cape Shoalwater 10 To 60 Nm.