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PZZ135 Puget Sound And Hood Canal- 334 Am Pst Fri Dec 8 2023
Today..S wind to 10 kt in the morning becoming light. Wind waves 1 ft or less in the morning becoming less than 1 ft. A chance of showers in the morning.
Tonight..SE wind to 10 kt. Wind waves 1 ft or less.
Sat..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. A chance of rain in the morning then rain in the afternoon.
Sat night..S wind 15 to 25 kt. Wind waves 2 to 4 ft.
Sun..S wind 10 to 20 kt becoming 5 to 15 kt in the afternoon. Wind waves 1 to 3 ft.
Sun night..S wind 5 to 15 kt becoming sw to 10 kt after midnight. Wind waves 2 ft or less.
Mon..NW wind to 10 kt becoming light. Wind waves 1 ft or less.
Tue..Light wind. Wind waves less than 1 ft.

PZZ100 334 Am Pst Fri Dec 8 2023
Synopsis for the northern and central washington coastal and inland waters..Onshore flow today will turn southerly then increase tonight into Saturday as a strong pacific frontal system forms over the ne pacific. This system will bring gales to the waters. Winds will ease on Sunday. The flow weakens and turns offshore early next week with high pressure.

FXUS66 KSEW 081101 AFDSEW

Area Forecast Discussion National Weather Service Seattle WA 301 AM PST Fri Dec 8 2023

SYNOPSIS
Showers will continue to taper through the morning for a brief lull in the active weather this afternoon and evening.
The next vigorous system will move into the region Saturday into Sunday and will bring moderate to heavy rain, mountain snow, and areas of gusty winds. A quieter period of weather is expected early next week as upper level ridging moves back into the region.

SHORT TERM /TODAY THROUGH SUNDAY/
Scattered showers continue early this morning, with latest MRMS radar showing the heaviest showers currently moving inland along the coast. Snow continues to fall in the mountains, with latest observations indicating that Stevens Pass has picked up roughly 7 inches since this afternoon and Snoqualmie Pass has picked up roughly 6 inches.
The latest runs of the hi-res guidance still hint at a Puget Sound Convergence Zone developing across the central Sound for a few hours early this morning. A few more inches of snow could fall along the passes should the PSCZ develop and position itself along the US-2 or I-90 corridor. Thus, a Winter Weather Advisory remains in effect through mid morning.

Overall, expect to see showers taper through the morning hours today. Drier conditions are expected across western Washington this afternoon and evening as a shortwave ridge traverses the region. Afternoon highs will be in the mid to upper 40s across the forecast area.

The break in the active weather will be rather short-lived as the next vigorous system moves into the region Saturday into Sunday.
This system will bring another round of lowland rain, mountain snow, and gusty winds to the area. Moderate to heavy rainfall will be possible at times, with amounts generally ranging from 0.75-2 inches across the interior lowlands to 2-3 inches for areas along the coast. Snow levels will start out below pass level, but look to rise to 5000-6000 feet by early Sunday. Moderate to heavy snow will be possible in the mountains through early Sunday, with the latest probabilistic data showing roughly a 70-90 percent chance of snowfall exceeding a rate of 1 inch per hour at times Saturday afternoon and evening. Southerly winds will increase Saturday morning and peak during the mid-day hours before decreasing in the evening. Gusts to 45 mph will be possible at times for areas along the Pacific coast and from Port Townsend/Whidbey Island northward. In addition to lowland rain, mountain snow, and gusty winds, snow levels rising rapidly on Sunday has led to an increased concern for isolated river flooding. For more details on flooding, see the hydro section below.

LONG TERM /MONDAY THROUGH THURSDAY/
Ensembles remain in good agreement with regards to a ridge of high pressure moving into the region early next week for drier and relatively quieter weather for western Washington. The ridge axis looks to move inland by midweek, which could open the door for additional systems to move across the area. There is some indication of a weak upper level trough and its associated surface front approaching the region mid to late week and dissipating over the area as it moves inland. Have kept mention of precipitation in the forecast from Wednesday onward for now, however, the timing and track of this system will need to be refined in the coming days. 14

AVIATION
Northwesterly flow aloft today with an upper-level trough moving east into the central U.S. and ridging building into the Pacific Northwest. Light southerly flow at the surface will turn more southeasterly through the afternoon and into tonight generally 5 to 10 kt. A few scattered showers across Western Washington this morning with a mix of VFR and MVFR conditions, with gradual improvement to VFR as showers shift east of the Cascades into the afternoon.

KSEA...A few vicinity showers through the early morning with MVFR CIGs as an upper-level trough shifts off to our east. Northwesterly flow aloft as weak riding builds eastward into the Pacific Northwest. A return to VFR this afternoon with light southerly flow trending to the southeast into the afternoon and continuing into tonight.

Davis

MARINE
Onshore flow is currently waning down tonight with winds in the Strait of Juan de Fuca subsiding below Small Craft Advisory levels later tonight, therefore will allow the advisory to expire.
Winds will otherwise remain benign today.

A strong low pressure system is moving into the NE Pacific for the weekend, draping a cold front over the area waters. The forecast remains on track for strong southerly winds reaching gale force beginning late tonight through Saturday for the coastal waters.
Gales are also likely Saturday for the East Entrance to the Strait of Juan de Fuca and Admiralty Inlet. Therefore, Gale Watches have been issued for the aforementioned locations. Winds will likely reach gale force into the Haro Strait, but have held off issuing a gale watch for the entire Northern Inland Waters zone. Winds will taper off Saturday night and remain benign into next week.

Seas 7 to 9 ft at 12 s today before rising to around 12 to 16 ft though the weekend. Seas will then plummet to 3 to 5 ft by Monday into Tuesday before the next system brings seas back above 10 ft Wednesday.

LH

HYDROLOGY
The Chehalis River continues to drop with Grand Mound now in Action Stage, though Porter remains in Minor Flood Stage.
Levels will continue to drop on rivers area-wide today with generally dry conditions after scattered light showers shift east of the area later this morning.

A brief lull in activity today before the next frontal system brings another round of rain and mountain snow. Snow levels start off between 1500 and 2000 ft Saturday then rise to near 7500 ft Saturday night. Forecast rainfall totals range from 3-5 inches to 2.5 to 3.5 inches along the coast and over the Cascades. A combination of rain and snowmelt will lead to rises in river levels, especially with increased sensitivity from recent flooding earlier this week as many rivers are currently in or near Action Stage. There is a low chance (15% or less) of exceeding flood stage on rivers in the outlook areas of Mason, King, Thurston, Grays Harbor, and Lewis Counties.
Slightly greater chances for flooding along the Skokomish River in Mason County where a Flood Watch remains in effect through Sunday morning.

Davis

SEW WATCHES/WARNINGS/ADVISORIES
WA...Flood Watch through late Saturday night for Hood Canal Area- Lower Chehalis Valley Area-Olympics.

Winter Weather Advisory until 10 AM PST this morning 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 4 AM PST early this morning for Central U.S. Waters Strait Of Juan De Fuca-East Entrance U.S. Waters Strait Of Juan De Fuca.

Gale Watch from Saturday morning through Saturday evening for Admiralty Inlet-East Entrance U.S. Waters Strait Of Juan De Fuca.

Gale Watch from late tonight through Saturday evening 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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Tacoma Narrows Bridge
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Fri -- 02:38 AM PST     9.38 feet High Tide
Fri -- 02:58 AM PST     Moonrise
Fri -- 07:18 AM PST     5.95 feet Low Tide
Fri -- 07:43 AM PST     Sunrise
Fri -- 01:24 PM PST     12.24 feet High Tide
Fri -- 01:52 PM PST     Moonset
Fri -- 04:19 PM PST     Sunset
Fri -- 08:32 PM PST     1.41 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION

Tacoma Narrows Bridge, Washington, Tide feet

Discovery Island
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Fri -- 12:18 AM PST     0.88 knots Max Flood
Fri -- 02:54 AM PST     -0.00 knots Slack
Fri -- 02:58 AM PST     Moonrise
Fri -- 05:58 AM PST     -0.78 knots Max Ebb
Fri -- 07:43 AM PST     Sunrise
Fri -- 09:21 AM PST     0.00 knots Slack
Fri -- 11:38 AM PST     0.79 knots Max Flood
Fri -- 01:50 PM PST     -0.00 knots Slack
Fri -- 01:52 PM PST     Moonset
Fri -- 04:19 PM PST     Sunset
Fri -- 06:10 PM PST     -1.78 knots Max Ebb
Fri -- 10:29 PM PST     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION

Discovery Island, 3.3 miles NE of, Washington Current, knots

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