Point Grenville to Cape Shoalwater WA out 10 to 60 NM Marine Forecast
|Today...Ne Wind To 10 Kt Becoming Nw In The Afternoon. Wind Waves 1 Ft. W Swell 7 Ft At 13 Seconds.
|Tonight...Nw Wind 5 To 15 Kt. Wind Waves 1 To 2 Ft. W Swell 6 Ft At 12 Seconds.
|Sat...W Wind 5 To 15 Kt. Wind Waves 1 To 2 Ft. W Swell 5 Ft At 12 Seconds.
|Sat Night...W Wind 5 To 15 Kt. Wind Waves 1 To 3 Ft. W Swell 6 To 8 Ft At 13 Seconds Building To 6 To 10 Ft At 14 Seconds After Midnight.
|Sun...W Wind 15 To 25 Kt Rising To 20 To 30 Kt In The Afternoon. Wind Waves 4 To 6 Ft. W Swell 10 Ft At 15 Seconds.
|Sun Night...W Wind 25 To 30 Kt Becoming 25 To 35 Kt After Midnight. Combined Seas 13 To 16 Ft With A Dominant Period Of 11 Seconds.
|Mon...Nw Wind 25 To 35 Kt Easing To 15 To 25 Kt. Combined Seas 16 To 19 Ft.
|Tue...W Wind 15 To 20 Kt Becoming Sw 20 To 25 Kt. Wind Waves 2 To 4 Ft. Nw Swell 10 To 12 Ft Becoming W 7 To 8 Ft.
| Area Forecast Discussion
National Weather Service Seattle WA
910am PST Fri Feb 23 2024
Shallow dense fog is lingering around the Everett & Vicinity up to Bellingham, and also down in Olympia & Vicinity. At times, isolated pockets of quarter mile visibilities have been seen, which have been brief (a lot of the fog has been elevated). The fog will burn off by 10am PST - revealing mostly clear for the remainder of the day. The weekend system remains on track. For more details (and an updated aviation/marine section), please see the discussion below for more details.
High pressure building briefly into the area today with morning fog and dry conditions. The ridge will flatten Saturday for increasing precipitation. A stronger frontal system will move through Sunday into Monday for lowland rain, heavy mountain snow, and breezy winds. A cooler, wetter weather pattern is expected for most of next week.
Short Term - Today through Sunday
Areas of fog developing early this morning across western Washington, particularly near Puget Sound and in the vicinity of San Juan Islands/Whatcom County. Expect fog to continue through this morning for these areas, likely becoming a bit more widespread over the next few hours. Low stratus and fog will clear late morning into midday with mostly sunny skies this afternoon due to brief ridging. The ridge will flatten Friday night into Saturday with a system north of the area. This will increase precipitation potential on Saturday, especially for King County northward, across the Cascades, and over the Olympic Peninsula. Temperatures will also cool a few degrees on Saturday with highs in the upper 40s to low 50s.
A stronger frontal system will slide southward across western Washington on Sunday associated with troughing moving southward across British Columbia and into the northern Pacific Northwest by Monday. Steadier lowland rain is expected on Sunday, along with breezy winds. At this time, the best potential for wind gusts exceeding 40 MPH is over Whidbey Island with a stronger westerly push through the Strait of Juan de Fuca later Sunday. Perhaps the most impactful weather on Sunday will be from snow over the Cascades and Olympics. Snow levels ranging from 3000 to 4000 feet Sunday will fall below 1000 feet by later Sunday night. A rain/snow mix will be likely at Snoqualmie Pass on Sunday before snow levels fall quickly late Sunday afternoon into Sunday evening. Snow amounts Sunday through Sunday night will range 1 to 2 feet for the Cascade Passes, with heaviest snowfall amounts over Stevens Pass. For this reason, a Winter Storm Watch has been issued for the Cascades from Sunday morning through Monday. Stratiform precipitation will transition more to convective showers Sunday night into early Monday with colder air aloft.
Long Term - Monday Through Thursday
Precipitation will continue on Monday, generally in the form of convective showers with at least minimal instability noted due to colder air aloft. Snow levels by early Monday morning will also range 200-700 feet. This will allow for the potential of snow or rain/snow mix into the lowlands. At this time, guidance suggests the area near Snohomish/Skagit Counties as a favored area for convergence Sunday night into Monday morning, leading to perhaps light snowfall accumulations on grassy or elevated surfaces, with a similar outcome for the Cascade Foothills. However, showers elsewhere on Monday may result in a rain/snow mix too. Any snowfall accumulations Monday morning will likely melt quickly by Monday afternoon due to highs in the low to mid 40s. Additional mountain snow is expected Monday as well with periods of showers.
Temperatures will be slightly colder Tuesday morning across western Washington. The threat for a rain/snow mix may exist again during this period, although Quantitative Precipitation Forecast amounts are generally lighter Monday night into early Tuesday. Ensemble guidance suggests the active period continues Tuesday through Thursday with additional weather systems moving into western Washington. Snow levels will slowly rise on Tuesday and further into midweek. Heavier mountain snow will be the theme during midweek with perhaps the most beneficial Cascade/Olympic snow pattern so far this season. If you plan on traveling over the Passes Sunday through next week, continue to monitor the forecast. Temperatures will remain cooler than normal for most of next week across the area. JD
Weak surface ridging over the waters will gradually give way to an approaching frontal system early Sunday. The vigorous front will sweep across area waters early Sunday followed by strong post-frontal onshore flow Sunday afternoon into Sunday night. At this time, it looks likely that gales will develop in the strait as well as adjacent waters to the east entrance. Additional frontal systems will follow throughout most of next week for an active pattern.
Seas 5 to 7 ft will build on Sunday to around 12 to 16 ft and remain near if not above 10 feet for most of next week. 27
No river flooding is forecast over the next 7 days, but heavy precipitation entering the region next week may contribute to river rises across western Washington.
NOAA Seattle WA Office: Watches - Warnings - Advisories
WA...Winter Storm Watch from late Saturday night through Monday afternoon for West Slopes North Cascades and Passes-West Slopes North Central Cascades and Passes.
Winter Storm Watch from Sunday morning through Monday afternoon for West Slopes South Central Cascades and Passes.
PZ...Small Craft Advisory from 4pm this afternoon to 4pm PST Saturday for
Central U.S. Waters Strait Of Juan De Fuca.
Small Craft Advisory from 4pm this afternoon to 4am PST Saturday for
East Entrance U.S. Waters Strait Of Juan De Fuca.