Point Grenville to Cape Shoalwater WA out 10 NM Marine Forecast
| Today...S Wind 20 To 25 Kt, Rising To 25 To 35 Kt Late This Morning And Early Afternoon, Easing To 15 To 20 Kt Late. Seas 9 To 12 Ft. Wave Detail: Sw 11 Ft At 8 Seconds And W 8 Ft At 14 Seconds. Rain. |
| Tonight...Sw Wind 15 To 20 Kt. Seas 7 To 10 Ft. Wave Detail: S 6 Ft At 7 Seconds And W 8 Ft At 14 Seconds. Rain. |
| Mon...S Wind 10 To 15 Kt. Seas 7 To 8 Ft. Wave Detail: S 3 Ft At 6 Seconds And W 8 Ft At 12 Seconds. Rain. |
| Mon Night...S Wind 5 To 10 Kt. Seas 7 To 8 Ft. Wave Detail: W 8 Ft At 13 Seconds. Rain, Mainly In The Evening. |
| Tue...Se Wind 5 To 10 Kt, Veering To S In The Afternoon. Seas 7 To 8 Ft. Wave Detail: W 7 Ft At 14 Seconds. A Chance Of Rain. |
| Tue Night...Nw Wind 5 To 10 Kt, Veering To E After Midnight. Seas 6 To 7 Ft. Wave Detail: W 7 Ft At 15 Seconds. A Chance Of Showers After Midnight. |
| Wed...Se Wind 10 To 15 Kt, Becoming S 15 To 20 Kt In The Afternoon. Seas 6 To 7 Ft. Wave Detail: S 6 Ft At 6 Seconds And W 7 Ft At 15 Seconds. Showers. |
| Wed Night...S Wind 15 To 20 Kt, Rising To 20 To 25 Kt After Midnight. Seas 6 To 8 Ft, Building To 8 To 11 Ft After Midnight. Wave Detail: Sw 11 Ft At 11 Seconds And W 4 Ft At 13 Seconds. Rain. |
| Thu...S Wind 20 To 25 Kt. Seas 11 To 15 Ft, Building To 13 To 16 Ft In The Afternoon. Wave Detail: S 2 Ft At 6 Seconds And Sw 16 Ft At 15 Seconds. Showers. |
| Thu Night...Sw Wind 15 To 20 Kt. Seas 14 To 17 Ft, Subsiding To 12 To 15 Ft After Midnight. Wave Detail: Sw 17 Ft At 15 Seconds. Showers. |
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Area Forecast Discussion National Weather Service Seattle WA 832am PDT Sunday Mar 23 2025 An atmospheric river will continue to bring heavier precipitation through tonight, especially for the Olympics and Cascades from King County northwards. Snow levels also continue to rise this morning, however, moderate to heavy snow will continue for another couple hours at Stevens Pass before transitioning to rain. Otherwise, our friends at the Northwest Avalanche Center have an Avalanche Warning up for the Cascades. In addition, breezy winds are expected today, with gusts generally ranging 20 to 40 MPH, and near 45 MPH around Everett and Admiralty Inlet. No major forecast updates this morning. Synopsis An atmospheric river will bring heavier precipitation, rising snow levels, and breezy winds through Monday. Upper level ridge building Monday night into Tuesday with record high temperatures likely Tuesday. Upper level low offshore Wednesday will bring the potential for showers and thunderstorms. The low will remain offshore with unsettled weather Thursday and Friday. A weak upper level ridge will try and build Saturday. Short Term - Today through Tuesday Satellite imagery shows cloudy skies over Western Washington early this morning. Precipitation echoes on the doppler radar starting to fill in across the area with a warm front in place. Temperatures at 3 am/10z were in the lower to mid 40s. Pluviophiles are going to love the next couple of days. Warm front over Western Washington today with an atmospheric river moving inland over Vancouver Island. Not raining in a few areas early this morning but by sunrise rain over the entire area. Snow levels near 4000 feet rising to at least 6000 feet this afternoon. Could see up to 6 inches of new snow in the North Cascades this morning before the increasing snow levels. Will stay with the winter weather advisory for this area until 11 am. Highs will be in the lower to mid 50s. Atmospheric river right over Western Washington tonight. Forecasted IVT values in the 700-800 kg/m/seconds. Westerly 850 mb winds as strong as 50 knots. Snow levels 6500 feet in the North Cascades and around 7500 feet elsewhere. The heavy rain in the mountains will create dangerous avalanche conditions. Our friends at the Northwest Avalanche Center already have a warning up for the Cascades. In the lowlands, rain along with breezy southerly winds, 15 to 25 mph with higher gusts. Temperatures will remain steady overnight with lows in the lower 50s. Record high low temperatures will be set for many locations. Atmospheric river remaining over Western Washington Monday. IVT values lowering to 400 to 500 kg/m/sec. 850 mb winds also easing to 20 to 35 knots a good indication the atmospheric river will be weakening. Snow levels well above the pass levels. With more significant rainfall in the mountains hydrology concerns will be elevated. See hydrology section for more details. Highs well above normal, in the mid 50s to lower 60s. Upper level ridge beginning to build over Western Washington Monday night pushing what is left of the atmospheric river north into Southern British Columbia. Even with the rain coming to an end in some places mostly cloudy skies will keep lows in the mid 40s to lower 50s. More record high low temperatures possible. Upper level ridge continuing to build Tuesday with just a slight chance of rain along the coast and near the Canadian border by afternoon. Record high temperatures have been in the forecast for the last couple of days. Model trends this morning indicating highs a couple degrees warmer than the previous forecasts with lower 70s not only over the Southwest Interior but also in the Cascade foothills. The GFS (Global Forecast System) ensembles up to a 67 percent chance of lower 70s in Seattle. ECMWF (European Centre for Medium-Range Weather Forecasts) ensembles not as excited about 70s for Seattle but have almost all the solutions in the mid to upper 60s. General range for the highs over the entire area 60s and lower 70s. Long Term - Wednesday Through Saturday Extended solutions remaining consistent on the 00z run with a classic pattern for convection still in place over Western Washington Wednesday afternoon and evening. Near record warm air mass in place combined with a negatively tilted trough approaching from the southwest in the afternoon will create a very unstable air mass. It is still too early to go much more than a chance of thunderstorms for Wednesday afternoon and evening. Negatively tilted troughs have a habit of slowing down as they approach the area. If the trough timing is slower than the current model solutions this will push the convection threat out of the most favorable time frame. Wide spread on the high temperatures in the ensembles. ECMWF ensembles already hinting at a slower trough arrival with warmer high temperatures Wednesday versus Tuesday. GFS ensembles staying with the idea of convection developing in the afternoon capping high temperatures in the 60s. Current forecast more in line with GFS. Negatively tilted trough spinning out of upper level low offshore moving through Western Washington Wednesday night with showers and a chance of thunderstorms. Upper level low remaining off the coast Thursday and Friday with impulses kicking out of the low moving over the area keeping showers in the forecast. Snow levels lower back down below the passes by Friday. High temperatures returning back to near normal, in the lower to mid 50s. Upper level low moving off to the northwest Saturday and weakening. Upper level ridge trying to build over the area ahead of another negatively tilted trough approaching from the southwest. Ensembles not indicating much faith in the ridge with plenty of the solutions indicating light precipitation keeping Marine A frontal system will continue to cross the coastal waters today, bringing a warm front with increased southerlies to most of our area waters. Latest guidance indicates stronger southerlies in the coastal waters, so have upgraded all the coastal water zones to a Gale Warning. Elsewhere, small craft southerlies can be expected in the interior waters, with a few gusts up to gale strength possible in the Eastern Strait and Admiralty Inlet later this evening. Winds look to subside into Monday as a weak surface ridges builds into Tuesday for calmer conditions. Another frontal system looks to enter the area on Wednesday for additional rounds of elevated winds and seas. Combined seas this morning around 8 to 11 feet will remain throughout the weekend. The highest seas (10 to 11 feet) will likely remain in the outer coastal water zones. Seas look to decrease below 10 feet early next week, before building back up to around 12 to 16 feet towards midweek. Mazurkiewicz Hydrology Heavy rain in the mountains with rising snow levels the next couple of days. Forecasted rainfall amounts in the next 36 hours in the 4 to 6 inch range over the Olympics with 2 to 4 inches over the Cascades. Snow levels rising to 6000 to 7500 feet. The Skokomish river is likely to go above flood stage as early as late this afternoon. This amount of rain combined with the rising snow levels will put pressure on the remaining rivers in the area. Fortunately with the rivers relatively low this morning no additional flooding is forecast Monday into Tuesday. A bunch of the rivers flowing out of the Central Cascades, including but not limited to the Snoqualmie, could reach action stage. Will be keeping an eye on the Bogachiel NOAA Seattle WA Office: Watches - Warnings - Advisories WA...Winter Weather Advisory until 11am PDT this morning for Cascades of Snohomish and Northern King Counties-Cascades of Whatcom and Skagit Counties. PZ...Small Craft Advisory until 11pm PDT this evening for Admiralty Inlet Central U.S. Waters Strait Of Juan De Fuca- Northern Inland Waters Including The San Juan Islands- Puget Sound and Hood Canal West Entrance USA Waters Strait Of Juan De Fuca. Small Craft Advisory until 3pm PDT this afternoon for East Entrance U.S. Waters Strait Of Juan De Fuca. Gale Warning until 5pm PDT this afternoon for Coastal Waters From Cape Flattery To James Island 10 To 60 Nm- Coastal Waters From Cape Flattery To James Island Out 10 Nm- Coastal Waters From James Island To Point Grenville 10 To 60 Nm- Coastal Waters From James Island To Point Grenville Out 10 Nm- Coastal Waters From Point Grenville To Cape Shoalwater 10 To 60 Nm- Coastal Waters From Point Grenville To Cape Shoalwater Out 10 Nm. Small Craft Advisory from 5pm this afternoon to 2am PDT Monday for Coastal Waters From Cape Flattery To James Island 10 To 60 Nm- Coastal Waters From Cape Flattery To James Island Out 10 Nm- Coastal Waters From James Island To Point Grenville 10 To 60 Nm- Coastal Waters From James Island To Point Grenville Out 10 Nm- Coastal Waters From Point Grenville To Cape Shoalwater 10 To 60 Nm- Coastal Waters From Point Grenville To Cape Shoalwater Out 10 Nm. |
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