Cape Flattery to James Island WA out 10 to 60 NM Marine Forecast
| Today...Se Wind 25 To 35 Kt With Gusts Up To 45 Kt, Veering To Sw 20 To 30 Kt Early This Afternoon. Seas 14 To 17 Ft, Subsiding To 11 To 14 Ft This Afternoon. Wave Detail: E 2 Ft At 6 Seconds, S 16 Ft At 10 Seconds And W 7 Ft At 15 Seconds. Rain Early This Morning, Then A Chance Of Rain Late This Morning And Early Afternoon. A Slight Chance Of Rain Late. |
| Tonight...W Wind 15 To 25 Kt, Easing To 10 To 15 Kt After Midnight. Seas 12 To 14 Ft, Subsiding To 9 To 13 Ft After Midnight. Wave Detail: S 8 Ft At 10 Seconds And W 13 Ft At 13 Seconds. A Chance Of Rain After Midnight. |
| Thu...S Wind 15 To 20 Kt. Seas Around 9 Ft. Wave Detail: S 6 Ft At 8 Seconds And W 9 Ft At 14 Seconds. Rain. |
| Thu Night...S Wind Around 20 Kt, Rising To Around 25 Kt With Gusts Up To 35 Kt After Midnight. Seas 9 To 10 Ft, Building To 10 To 14 Ft After Midnight. Wave Detail: S 9 Ft At 7 Seconds And W 11 Ft At 15 Seconds. Rain. |
| Fri...S Wind 25 To 30 Kt With Gusts Up To 40 Kt. Seas 13 To 15 Ft, Building To 15 To 16 Ft In The Afternoon. Wave Detail: S 11 Ft At 8 Seconds And W 15 Ft At 15 Seconds. Rain. |
| Fri Night...S Wind 20 To 25 Kt. Gusts Up To 35 Kt After Midnight. Seas 14 To 15 Ft, Subsiding To 12 To 14 Ft After Midnight. Wave Detail: Se 7 Ft At 7 Seconds And Sw 15 Ft At 15 Seconds. Rain. |
| Sat...S Wind 25 To 35 Kt. Seas 11 To 13 Ft, Building To 15 To 16 Ft In The Afternoon. Wave Detail: S 15 Ft At 9 Seconds And W 10 Ft At 13 Seconds. Rain. |
| Sat Night...Sw Wind 15 To 20 Kt. Seas 13 To 14 Ft. Wave Detail: S 10 Ft At 9 Seconds And W 13 Ft At 12 Seconds. Rain. |
| Sun...S Wind 15 To 20 Kt. Seas 12 To 14 Ft. Wave Detail: S 5 Ft At 9 Seconds And W 13 Ft At 13 Seconds. Rain. |
| Sun Night...Sw Wind Around 15 Kt. Seas 11 To 13 Ft. Wave Detail: S 6 Ft At 9 Seconds And W 12 Ft At 13 Seconds. Rain. |
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Area Forecast Discussion National Weather Service Seattle WA 312am PST Wednesday Feb 19 2025 Synopsis A warm front will continue to advance across western Washington today, with lowland rain and mountain snow continuing ahead of a trailing cold front. A weak upper ridge will build into the region Thursday, but will only be a brief break as the region will again see another series of fronts approach Friday. An atmospheric river looks to move into western Washington over the weekend, bringing heavy rain to the area into early next week. Short Term - Today through Friday The next weather system is already pushing into the region with the leading warm front lifting across the region, spreading widespread rainfall and some mountain snow into the Cascades. Snow levels may rise just a bit in the warm sector before the trailing cold front, in the process of occluding, makes its way across Western Washington late today. Expect continued lowland rain and mountain snow above around 3500 ft through the day, with snow levels rising closer to 4500 ft in spots. Light easterly winds near Snoqualmie maintain a low (10%) likelihood of freezing rain, but thermal profile looks marginal and suggests the precipitation may fall mostly as snow. Most likely snow amounts remain around 5-6 inches for the central Cascades (including Stevens and Snoqualmie passes) with higher amounts in the southern zones (including Paradise and White Pass). It's worth noting that the "high-end" snow amounts for the central Cascades have increased a little bit owing to heavier focused precipitation late tonight behind the cold front. So, while the forecast hasn't changed (nor has the current winter weather advisory), will need to continue to evaluate the threat and any potential need to expand the advisory northward. Showers will then taper by late Thursday morning as a weak upper level high pressure moves back over the area. This upper ridge will give a break in the action for most, but some light precipitation remains possible closer to the coast and the far northern areas as the leading warm front associated with the next system isn't too far behind. For most though, a drier day with temperatures in the upper 40s to lower 50s. Another cold front sweeps across the region on Friday as it falls apart. This will bring much more modest precipitation amounts with up to around a tenth of an inch of rain for most (locally higher to around half an inch along the coast), and another light snow accumulation down to around 4000 ft. This will just be setting the stage for the weekend, however. Long Term - Saturday Through Tuesday The weekend looks to be rather wet across the region with an atmospheric river setting up near the region Saturday and over the area into the first part of next week. The rainfall amounts remain fairly similar to the previous forecast and remain in line with a slightly wetter shift in the probabilistic guidance this cycle. With a fairly mild air mass over the region and snow levels climbing to 6000 ft or higher on Saturday, expect much of this precipitation to fall in liquid form. This will enhance the risk of seeing areas rivers rise closer to flood stage - see theHydrology ction for additional details regarding this threat. The pattern looks to remain active with another disturbance crossing the region by Tuesday, though at least it appears a bit more fast-moving which will limit impacts. Marine Gales over much of the coastal waters will transition to small craft advisory conditions in the wake of an occluded front that will move onshore around midday. Surface high pressure rebuilding behind the front will lead to a punch of westerlies through the strait as well as an increase in southerlies through Puget Sound this afternoon and evening. Surface ridging over the coastal waters tonight will shift inland on Thursday as another warm front lifts northward across the offshore and coastal waters. A series of systems will impact the waters Friday through the weekend likely necessitating additional headlines for wind and/or seas across much of the area waters. Coastal seas will build back above 10 feet today and tonight. They will briefly subside on Thursday before becoming hazardous once again during an active period expected Friday through weekend. 27 Hydrology An active pattern will bring a series of frontal systems across the region this week. With snow levels generally around 3000 feet, expect some rises on rivers (especially the Skokomish) but river flooding is not expected through Friday. The additional moisture, however, could set the stage for a more hydrologically notable event by the weekend. The potential arrival of an atmospheric river this weekend into early next week would have the potential to push rivers even higher, opening the door to the potential for flooding by the early portion of next week. It is increasingly likely that snow levels will climb into the 6000 ft or higher range this weekend as a mild and moist weather system takes aim at the region. While there remains some uncertainty with respect to the location of heaviest rainfall, there's a high likelihood (greater than 70% chance) of 3 to 4 inches of rain across the mountains. With around a 40% chance of seeing a 5+ inch total in the favored locations of the Olympics and the central Cascades, will need to closely monitor the precipitation forecasts heading into the weekend. NOAA Seattle WA Office: Watches - Warnings - Advisories WA...Winter Weather Advisory until 4am PST Thursday for West Slopes South Central Cascades and Passes. PZ...Small Craft Advisory from 7am this morning to 2am PST Thursday for Grays Harbor Bar Small Craft Advisory until 10pm PST this evening for Central U.S. Waters Strait Of Juan De Fuca- Northern Inland Waters Including The San Juan Islands- West Entrance USA Waters Strait Of Juan De Fuca. Gale Warning until 10pm PST this evening for East Entrance U.S. Waters Strait Of Juan De Fuca. Small Craft Advisory from noon today to 10pm PST this evening for Puget Sound and Hood Canal Gale Warning until 10am PST this morning 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. Small Craft Advisory from 10am this morning to 4am PST Thursday 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. Small Craft Advisory until 4am PST Thursday for Coastal Waters From Point Grenville To Cape Shoalwater Out 10 Nm. |
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