Point Grenville to Cape Shoalwater WA out 10 NM Marine Forecast
| Tonight...W Wind 5 To 15 Kt. Wind Waves 1 To 3 Ft. W Swell 7 Ft At 7 Seconds. |
| Sun...W Wind 5 To 15 Kt Becoming Sw 10 To 20 Kt In The Afternoon. Wind Waves 1 To 3 Ft. W Swell 7 To 8 Ft At 11 Seconds Building To 8 To 10 Ft At 11 Seconds In The Afternoon. |
| Sun Night...W Wind 5 To 15 Kt. Wind Waves 1 To 3 Ft. W Swell 9 Ft At 10 Seconds. |
| Mon...W Wind 5 To 15 Kt. Wind Waves 1 To 3 Ft. W Swell 8 Ft At 10 Seconds. |
| Mon Night...Sw Wind 10 To 20 Kt Becoming 5 To 15 Kt After Midnight. Wind Waves 1 To 3 Ft. W Swell 8 Ft At 11 Seconds. |
| Tue...N Wind 5 To 15 Kt. Wind Waves 1 To 2 Ft. W Swell 8 Ft At 11 Seconds. |
| Tue Night...Nw Wind 5 To 15 Kt. Wind Waves 1 To 2 Ft. W Swell 7 Ft At 10 Seconds. |
| Wed...W Wind 5 To 15 Kt Becoming Sw. Wind Waves 1 To 2 Ft. W Swell 4 Ft. |
| Thu...W Wind To 10 Kt Becoming Nw 5 To 15 Kt. Wind Waves 1 To 2 Ft. W Swell 5 Ft. |
| Area Forecast Discussion National Weather Service Seattle WA 847pm PDT Sat April 27 2024 Synopsis The active weather pattern will continue into early next week as a series of fronts pass through the region. Snow is expected in the passes Sunday night into Monday. A trend toward temperatures closer to normal and somewhat drier conditions is expected during the later half of the coming week. Short Term - Tonight Through Tuesday Latest satellite imagery shows W WA socked in with clouds as a weak front continues to slog through the area. Current radar does a good job showing the porous nature of this feature as echoes certainly represent a system passing through, even though activity is essentially on the scattered side. Models continue to support what radar loop is showing with the front essentially stalling out over the area for just long enough for the associated upper level trough to sweep into the area Sunday, keeping the forecast wet. Inherited forecast continues to handle this well and as such will not do a full rehash here. For additional forecast details, please refer to the Previous Discussion section below. 18 From Previous Discussion...Light precipitation continues to spread across the area this afternoon ahead of an occluded front that will dissipate as it moves onshore this evening. A few showers will linger over Western Washington overnight behind the front. An upper trough west of Haida Gwaii will dig southward into the region later Sunday into Monday for cool, showery conditions. The cooler temperatures aloft will destabilize the atmosphere enough for a slight chance of thunder as well as lower snow levels to most of the passes by Sunday night into Monday. Relatively warm ground temperatures may limit accumulations at Snoqualmie Pass. Nonetheless, higher Steven Pass may accumulate somewhere in the range of 5 to 7 inches over a 12 hour period (06Z-18Z Monday). Another shortwave arrives Monday night into Tuesday. The focus with the precipitation with that system may be a little further south...perhaps mainly the southern half of the CWA. Long Term - Wednesday Through Saturday Deterministic model runs have shown little to no run-to-run consistency for the long term forecast over the past couple of days. And this meshes well with the high degree of uncertainty expressed by the NBM during that time period. There's increasing confidence that we'll see a short break in the weather on Wednesday, but the forecast picture becomes increasingly murky Thursday through Saturday. Despite the fact that deterministic runs of the GFS/Euro have flipped from earlier solutions, some of the ensemble means (the Euro in particular) maintain some positive height anomalies late next week. Current forecasts for late next week look awfully close to climatological norms...and that's probably not a bad approximation at this time. 27 Marine The strongest winds over the coastal waters have eased this evening as the front is pushing onshore. However, the seas remain steep and as a result have extended the small craft advisories for the coastal waters into the overnight period. Expect seas to gradually ease and dominant period to again lengthen as the locally generated short-period waves fade away. Elsewhere, will maintain the advisories with southerlies ahead of the front over parts of the interior, followed by a strong west push through the Strait of Juan de Fuca. Marginal wind gusts to SCA (Small Craft Advisory) thresholds possible Sunday afternoon (35% chance) over the offshore waters with another round of Small Craft Advisories likely through the Strait with another afternoon push and possibly through the beginning of next week. Expect combined seas to build to near 10 feet Sunday night and Monday, before subsiding through the early part of next week. Hydrology No river flooding is expected over the next seven days. NOAA Seattle WA Office: Watches - Warnings - Advisories WA...Winter Weather Advisory from 11pm Sunday to 11am PDT Monday for West Slopes North Cascades and Passes-West Slopes North Central Cascades and Passes-West Slopes South Central Cascades and Passes. PZ...Small Craft Advisory until 5am PDT Sunday for Central U.S. Waters Strait Of Juan De Fuca- 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- East Entrance U.S. Waters Strait Of Juan De Fuca. Small Craft Advisory until 11pm PDT this evening for Admiralty Inlet Northern Inland Waters Including The San Juan Islands. |
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