San Juan Islands and Northern Inland Waters Marine Forecast
|Tonight...Se Wind 10 To 20 Kt. Wind Waves 1 To 3 Ft.|
|Thu...Se Wind 5 To 15 Kt Easing To 10 Kt In The Afternoon. Wind Waves 2 Ft Or Less.|
|Thu Night...Se Wind To 10 Kt Becoming E After Midnight. Wind Waves 1 Ft Or Less.|
|Fri...Light Wind. Wind Waves Less Than 1 Ft.|
|Fri Night...Ne Wind To 10 Kt Becoming E After Midnight. Wind Waves 1 Ft Or Less.|
|Sat...Se Wind 20 To 30 Kt Easing To 15 To 25 Kt In The Afternoon. Wind Waves 3 To 5 Ft.|
|Sat Night...Se Wind 15 To 25 Kt Becoming S 5 To 15 Kt After Midnight. Wind Waves 2 To 4 Ft Subsiding To 2 Ft Or Less After Midnight.|
|Sun...Sw Wind 5 To 15 Kt Becoming Se 15 To 25 Kt. Wind Waves 2 Ft Or Less Building To 2 To 4 Ft.|
|Mon...Se Wind 15 To 25 Kt Easing To 10 To 20 Kt. Wind Waves 2 To 4 Ft.|
| 830 PM PST Wed Dec 2 2020 |
Northern and Central Washington Coastal and Inland Waters - PZZ100
A weak front will dissipate over the Coastal Waters on Thursday. A second frontal system will move through the area Saturday and Saturday night with weak onshore flow behind the front on Sunday. A third frontal system will reach the area on Monday.
| Area Forecast Discussion|
National Weather Service Seattle WA
745pm PST Wednesday Dec 2 2020
Gusty east winds through the Cascades will decrease tonight. A dissipating front will bring clouds to the area later Thursday. A weak weather system will reach the area Saturday night. Additional weather systems will arrive next week.
Short Term - Tonight Through Saturday
Starting to see some clouds start to make their way to the coastal areas this evening but overall much of W WA remains clear at the time of this writing. Winds in the Cascade passes are winding down, but still some gusts with Cle Elum reporting a gust to 24 MPH and North Bend seeing a gust to 29 MPH. Lastly, while one certainly could not tell looking at current obs...it was a bit of a warm day today with Sea-Tac getting up to 60...which set a new record, beating the old record of 57 established back in 1958. Current temps, however, have cooled considerably, with most locations reporting in the 30s to lower 40s...the only exception is up in Everett, where it is 50. That will drop pretty soon though. Temp/dewpoint spreads are looking close to non-existent in the South Sound and Chehalis valley once again, where some visibility dips are already being reported...so patchy fog is likely to develop there over the next few hours if not already present in some locations.
Inherited forecast pretty much on track as it accounts for the events described above. As such, no evening update is necessary. For forecast details, please refer to the Previous Discussion section below. 18
From Previous Discussion...Offshore flow will ease tonight and a few mid and high clouds will begin to arrive. A front will dissipate as it nears the coast Thursday and Thursday night and clouds will increase. The ridge rebounds a bit on Friday and offshore flow increases again late in the day with mostly clear skies again before a weak front arrives later on Saturday. 19
Long Term - Sunday Through Wednesday
From Previous Discussion...A chance of rain returns to Western Washington as the upper ridge slowly gives way over the first part of next week. There are some solutions now that bring more normal weather back into the region-- the 12z ECMWF (European Centre for Medium-Range Weather Forecasts) has a nice batch of rain and possibly blustery weather next Tuesday. The 12z GFS isn't as breezy, but it is wet--at least in the mountains next Tuesday. The overall blend of all the guidance isn't as wet and breezy as all that however, and we might not see the upper ridge give out as fast as the 12z runs show occuring around next Tuesday. 19
A weak front will dissipate over the Coastal Waters on Thursday. A second frontal system will move through the area Saturday and Saturday night with weak onshore flow behind the front on Sunday. A third frontal system will reach the area on Monday. Each front will bring a round of small craft advisory strength southeast winds to at least part of the area. West swell will build to 10-12 feet over the Coastal Waters tonight and remain 10+ feet for the most part through early next week. As such, will leave inherited headlines alone with the evening forecast package. Schneider/18
River flooding is not expected over the next 7 days.
.SEW WATCHES/WARNINGS/ADVISORIES... WA...None. PZ...Small Craft Advisory until 4pm PST Friday 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-West Entrance U.S. Waters Strait Of Juan De Fuca.
Small Craft Advisory until 4pm PST Friday for Grays Harbor Bar.