Mercer Island, WA Marine Weather and Tide Forecast
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Marine Weather and Tide Forecast for Mercer Island, WA


December 4, 2023 12:45 PM PST (20:45 UTC)
Sunrise 7:37AM   Sunset 4:20PM   Moonrise  11:38PM   Moonset 12:53PM 

NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION. Privacy and Cookie policy

Marine Forecasts
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PZZ135 Puget Sound And Hood Canal- 911 Am Pst Mon Dec 4 2023
.small craft advisory in effect from 1 pm pst this afternoon through late tonight...
Today..S wind 5 to 15 kt rising to 15 to 25 kt in the afternoon. Wind waves 2 ft or less building to 2 to 4 ft in the afternoon. Rain.
Tonight..S wind 20 to 30 kt easing to 15 to 25 kt after midnight. Wind waves 3 to 5 ft. Rain.
Tue..SW wind 10 to 20 kt becoming S to 10 kt in the afternoon. Wind waves 1 to 3 ft subsiding to 1 ft or less in the afternoon. Rain.
Tue night..S wind 5 to 15 kt becoming E after midnight. Wind waves 2 ft or less.
Wed..N wind 5 to 15 kt becoming 10 to 20 kt in the afternoon. Wind waves 1 to 3 ft.
Wed night..S wind 5 to 15 kt. Wind waves 2 ft or less.
Thu..S wind 15 to 25 kt easing to 10 kt. Wind waves 2 to 4 ft subsiding to 1 ft or less.
Fri..S wind to 10 kt becoming light. Wind waves 1 ft or less.

PZZ100 911 Am Pst Mon Dec 4 2023
Synopsis for the northern and central washington coastal and inland waters..A warm front will move through today followed by a cold front Tuesday. Another frontal system will move inland mainly to the south of the waters later Wednesday into Thursday. High pressure will build over the area Friday.


7 Day Forecast for Marine Location Near Mercer Island, WA
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Area Discussion for - Seattle, WA
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FXUS66 KSEW 041726 AFDSEW

Area Forecast Discussion National Weather Service Seattle WA 926 AM PST Mon Dec 4 2023

UPDATE
No significant changes to the overall forecast. A potent atmospheric river is beginning to affect the region, with heavy precipitation and widespread river flooding. Gusty winds are also expected today - peaking this afternoon and evening - windiest along the coast and areas from Whidbey Island northward. Please see the hydro section below for updates to the hydrologic forecast.

PREV DISCUSSION
/issued 338 AM PST Mon Dec 4 2023/

SYNOPSIS...An atmospheric river will impact the region through Tuesday with periods of heavy rain and an increased risk of river flooding. An upper level trough will cross the region late in the week for a shift toward more showery precipitation, cooler temperatures, and lowering snow levels. A brief break in the active pattern is possible on Friday, before additional systems move through the region over the weekend.

SHORT TERM /TODAY THROUGH WEDNESDAY/...The radar is largely devoid of precip as of 2 AM PST as the region experiences another lull in activity. A quick look at the water vapor satellite loop shows a lengthy moisture tap just offshore being pulled northward ahead of a broad upper trough centered near 48N/150W. Surface analysis shows a warm front gradually marching northward along the northern Oregon coast. This warm front will lift northward across the area later today as precipitation spreads across Western Washington. Winds will pick up and become breezy to locally windy behind the warm front this evening.

Snow levels will climb to 8000 to 9000 feet across nearly all of the area by mid to late afternoon. Forecast QPF remains substantial with 36 hour totals 12Z Monday to 00Z Wednesday remaining in the range of 8 to 10 inches for the Olympics, 6 to 9 inches in the north/central Cascades, 3 or 4 inches along the coast, and 1.5 to 3 inches for the most of the interior lowlands outside of the Olympic rain shadow. Sharp river rises and increased risk of river flooding remain a concern later today into Tuesday. See the hydrology portion of the discussion for more on this.

Moderate to heavy rain will continue for much of the region tonight into Tuesday as a slow moving cold front gradually sags southeastward across the area. The axis of the heavier precipitation begins to shift toward Oregon by early Wednesday though a frontal wave may slow its progress southward somewhat.
Snow levels will gradually fall back to most pass levels by Wednesday night as cooler air filters back across the area.

LONG TERM /THURSDAY THROUGH SUNDAY/...Shower activity looks to increase on Thursday as an upper trough axis moves onshore. This should bring some modest snowfall totals to the passes. Models generally retain the idea of a short-lived drying trend later Friday into early Saturday as low amplitude upper ridging slides across the area. Ensembles are generally locked into the idea of another fairly typical fast moving December front arriving over the weekend for more lowland rain and mountain snow. 27

AVIATION...Warm front moving through the area today with the trailing cold front arriving Tuesday. Westerly flow aloft becoming southwest tonight.

KSEA...Ceilings 3000 to 4000 feet lowering to 1000 to 2000 feet with visibility 3-5sm in rain 15z-18z. MVFR ceilings and visibility continuing this afternoon into tonight. East southeast wind 4 to 8 knots becoming southerly 10 to 15 knots with gusts 20 to 25 knots around 00z. Felton

MARINE...A warm front will move through today followed by a cold front Tuesday. Another frontal system will move inland mainly to the south of the waters later Wednesday into Thursday.
High pressure will build over the area Friday.

Gale force winds over the coastal waters as well as the entrances to the Strait of Juan de Fuca today. Gale force winds ending over the coastal waters and West Entrance to the Strait late today.
Gales force winds developing in Admiralty Inlet and over the Northern Inland waters tonight with gales continuing at the East Entrance to the Strait. Small craft advisory winds for the remainder of the waters today and tonight. Winds easing on Tuesday with the only small craft advisory because of winds for the Central Strait of Juan de Fuca. Small craft advisories for the coastal waters because of seas in the 14 to 17 foot range.
Seas peaking Tuesday night near 20 feet before subsiding beginning Wednesday. Seas lowering back down below 10 feet Friday.

Small craft advisory winds possible over the coastal waters Thursday as a system moves inland mainly south of the area. Felton

HYDROLOGY...Atmospheric river aimed at Western Washington for the next 30-36 hours. Rain beginning early this morning along the coast spreading inland reaching the Cascades by mid morning.
Snow levels not quite as high as expected this morning. This may delay flooding onset or even in more rapid rises on rivers as snow levels increase significantly this afternoon. Snow levels are expected to rise quickly - 7500 feet in the Northern Cascades to 8500 feet in the Southern Cascades. They will remain high tonight, 8500 to 9500 feet before dropping slightly Tuesday to 7000 to 8500 feet.

Once the rain starts this morning over the area it will continue until at least Tuesday afternoon. Rainfall amounts during this time frame remain high, 8 to 10 inches over the Olympics, 6 to 9 inches in the Cascades, 3 to 4 inches along the coast and 1.5 to 3 inches over the interior ( with the exception of the rain shadow northeast of the Olympics ). This amount of rain combined with the rising snow levels will produce river flooding across the area.
Rivers will be on the rise later today and tonight. The Skokomish will be the first river to reach flood stage tonight. The remainder of the rivers predicted to flood will reach flood stage early to mid morning Tuesday. Rivers will crest Tuesday afternoon into Tuesday evening then begin to recede. There is still the potential for moderate flooding on some of the bigger rivers like the Snoqualmie, Snohomish and Skagit with a chance of the Skagit at Concrete and the Snoqualmie near Carnation reaching major flood stage.

There remains a degree of uncertainty in its scope and extent of the flooding. It will depend largely on how fast the air mass warms over the mountains today and the locations of the heaviest bands of precipitation. Stay tuned for the latest forecast developments.

In addition to the river flooding, burn scars in the Cascades will have to be monitored with the heavy precipitation forecast. Elevated risks of landslide and debris flows will also be possible, beginning this afternoon and continuing into Tuesday. The landslide risk could extend into Wednesday. Felton

SEW WATCHES/WARNINGS/ADVISORIES
WA...Flood Watch through late Wednesday night for Admiralty Inlet Area-Bellevue and Vicinity-Bremerton and Vicinity-Central Coast-East Puget Sound Lowlands-Eastern Strait of Juan de Fuca-Everett and Vicinity-Hood Canal Area-Lower Chehalis Valley Area-North Coast-Olympics-San Juan County-Seattle and Vicinity-Southwest Interior-Tacoma Area-West Slopes North Cascades and Passes-West Slopes North Central Cascades and Passes-West Slopes South Central Cascades and Passes-Western Skagit County-Western Strait of Juan De Fuca- Western Whatcom County.

Wind Advisory until midnight PST tonight for Admiralty Inlet Area-Central Coast-North Coast-San Juan County-Western Skagit County-Western Whatcom County.

PZ...Small Craft Advisory until 6 PM PST Tuesday for Grays Harbor Bar.

Gale Warning until 1 PM PST this afternoon for West Entrance U.S. Waters Strait Of Juan De Fuca.

Small Craft Advisory from 1 PM this afternoon to 6 AM PST Tuesday for West Entrance U.S. Waters Strait Of Juan De Fuca.

Small Craft Advisory until 1 PM PST Tuesday for Central U.S.
Waters Strait Of Juan De Fuca.

Gale Warning until 4 AM PST Tuesday for East Entrance U.S.
Waters Strait Of Juan De Fuca.

Small Craft Advisory until 6 PM PST this evening for Admiralty Inlet-Northern Inland Waters Including The San Juan Islands.

Gale Warning from 6 PM this evening to 4 AM PST Tuesday for Admiralty Inlet-Northern Inland Waters Including The San Juan Islands.

Small Craft Advisory from 1 PM this afternoon to 4 AM PST Tuesday for Puget Sound and Hood Canal.

Gale Warning until 1 AM PST Tuesday 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 1 AM to 6 PM PST Tuesday 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.


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesinHgDewPt
WPOW1 - West Point, WA 13 mi45 min SSE 9.9G11 48°F 29.9448°F
BMTW1 19 mi45 min ENE 2.9G5.1 49°F 29.94
TCMW1 - 9446482 - Tacoma Met, WA 20 mi45 min 0G1.9 46°F
TCNW1 - 9446484 - Tacoma, WA 21 mi45 min 52°F29.97
PTWW1 - 9444900 - Port Townsend, WA 48 mi45 min ESE 23G29 51°F 49°F29.87

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Wind History for Tacoma MET, WA
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Airport Reports
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AirportDistAgeWind ktVisSkyWeatherTempDewPtRHinHg
KBFI BOEING FIELD/KING COUNTY INTL,WA 2 sm21 minSE 035 smOvercast Mist 48°F48°F100%29.93
KRNT RENTON MUNI,WA 4 sm16 minS 064 smOvercast Lt Rain Mist 48°F46°F93%29.93
KSEA SEATTLETACOMA INTL,WA 7 sm52 minWSW 031 smOvercast Lt Rain Mist 48°F46°F93%29.94

Wind History from BFI
(wind in knots)


Tide / Current for Duwamish Waterway, Washington
   
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Duwamish Waterway
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Mon -- 03:15 AM PST     1.37 feet Low Tide
Mon -- 07:39 AM PST     Sunrise
Mon -- 10:53 AM PST     11.36 feet High Tide
Mon -- 12:53 PM PST     Moonset
Mon -- 04:18 PM PST     Sunset
Mon -- 05:39 PM PST     5.83 feet Low Tide
Mon -- 09:31 PM PST     7.11 feet High Tide
Mon -- 09:51 PM PST     Last Quarter
Mon -- 11:37 PM PST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Duwamish Waterway, Washington, Tide feet
12
am
4.5
1
am
3.2
2
am
2
3
am
1.4
4
am
1.6
5
am
2.7
6
am
4.3
7
am
6.3
8
am
8.4
9
am
10
10
am
11.1
11
am
11.4
12
pm
11
1
pm
10
2
pm
8.7
3
pm
7.4
4
pm
6.4
5
pm
5.9
6
pm
5.9
7
pm
6.2
8
pm
6.6
9
pm
7
10
pm
7.1
11
pm
6.7



Tide / Current for Restoration Point, 0.6 miles ESE of, Washington Current
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Restoration Point
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Mon -- 12:17 AM PST     -0.60 knots Max Ebb
Mon -- 04:04 AM PST     0.00 knots Slack
Mon -- 06:46 AM PST     0.55 knots Max Flood
Mon -- 07:40 AM PST     Sunrise
Mon -- 10:43 AM PST     -0.00 knots Slack
Mon -- 12:54 PM PST     Moonset
Mon -- 02:18 PM PST     -0.60 knots Max Ebb
Mon -- 04:19 PM PST     Sunset
Mon -- 08:06 PM PST     -0.03 knots Min Ebb
Mon -- 09:51 PM PST     Last Quarter
Mon -- 11:37 PM PST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Restoration Point, 0.6 miles ESE of, Washington Current, knots
12
am
-0.6
1
am
-0.6
2
am
-0.5
3
am
-0.3
4
am
-0
5
am
0.3
6
am
0.5
7
am
0.5
8
am
0.5
9
am
0.3
10
am
0.2
11
am
-0.1
12
pm
-0.3
1
pm
-0.5
2
pm
-0.6
3
pm
-0.6
4
pm
-0.5
5
pm
-0.3
6
pm
-0.2
7
pm
-0.1
8
pm
-0
9
pm
-0.1
10
pm
-0.2
11
pm
-0.3




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