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PZZ135 Puget Sound And Hood Canal- 829 Pm Pdt Mon Oct 2 2023
Tonight..S wind to 10 kt. Wind waves 1 ft or less. A chance of rain in the evening then a slight chance of rain after midnight. Patchy fog after midnight.
Tue..N wind to 10 kt. Wind waves 1 ft or less. A slight chance of rain in the morning then a chance of showers in the afternoon.
Tue night..Light wind. Wind waves 1 ft or less. Patchy fog after midnight. A slight chance of showers after midnight.
Wed..Light wind becoming se to 10 kt in the afternoon. Wind waves 1 ft or less.
Wed night..N wind to 10 kt. Wind waves 2 ft or less.
Thu..N wind to 10 kt becoming 5 to 15 kt in the afternoon. Wind waves 2 ft or less.
Thu night..N wind 5 to 15 kt becoming to 10 kt after midnight. Wind waves 2 ft or less.
Fri..N wind to 10 kt. Wind waves 1 ft or less.
Sat..Light wind. Wind waves 1 ft or less.

PZZ100 829 Pm Pdt Mon Oct 2 2023
Synopsis for the northern and central washington coastal and inland waters..A frontal system has moved through the waters this afternoon, with increasing onshore flow behind it. High pressure will rebuild tonight and remain over the waters into Thursday. A thermally induced surface trough will move up the coastline Thursday night then shift inland on Friday.

FXUS66 KSEW 030347 AFDSEW

Area Forecast Discussion National Weather Service Seattle WA 847 PM PDT Mon Oct 2 2023

UPDATE
No changes to the overall forecaster. Light rain will continue to transition to showers lingering mostly over the Cascades into Tuesday morning. Drier and warmer weather remains on tap for late in the week through the weekend. Please see the aviation and marine sections below for updates to those forecasts.

PREV DISCUSSION
/issued 247 PM PDT Mon Oct 2 2023/

SYNOPSIS
A weak front continues to move across Western Washington this afternoon with troughing moving east tonight.
A few showers lingering Tuesday into Wednesday with troughing to the north. Upper ridging then builds into the Pacific Northwest for drier, warmer weather through the weekend. More active weather likely next week.

SHORT TERM /TONIGHT THROUGH THURSDAY/
Clouds with rain moving across Western Washington this afternoon associated with a frontal system moving across the area. Showers will continue into this evening, with a weak convergence zone possible in the central Puget Sound. Showers tonight will be more confined into areas south of Snohomish County, particularly in the Cascades. A few showers may be around on Tuesday, but generally drier conditions are expected with at least some clearing possible in the afternoon.

Upper ridging begins to build offshore Tuesday night into Wednesday. However, troughing will move across BC/Alberta during the period, which will allow for at least the potential of light rain showers Tuesday night into Wednesday, with further clearing in the clouds later Wednesday. The upper ridge will build further into Western Washington on Thursday. This will lead to drier conditions and warmer temperatures. Fog development is likely Wednesday night into Thursday for a good portion of the lowlands, and will have to monitor the extent of fog Thursday morning into Thursday afternoon in regards to high temperatures. In general, temperatures in the 60s Tuesday and Wednesday will slowly warm into the upper 60s and low 70s in spots on Thursday.

LONG TERM /FRIDAY THROUGH MONDAY/
The upper ridge will be located across the Pacific Northwest Friday into Saturday for drier weather and warmer temperatures. Again, fog development is likely for at least Thursday night into Friday. Temperatures during this period will be dependent on the fog extent, but generally ranging 5 to 15 degrees above normal. The upper ridge slowly progresses eastward later Saturday into Sunday. Ensemble guidance is generally consistent in increasing troughing offshore and into the Pacific Northwest late Sunday and into early next week. This looks to be begin another period of more active weather for the area with increasing rain potential. JD

AVIATION
Northwesterly flow aloft as an upper level trough moves east into the Great Plains. Light rain has transitioned into drizzle across the area as conditions at terminals are hovering around IFR to LIFR. IFR conditions will continue overnight and into Tuesday morning as sufficient low level moisture keeps lower clouds around.
Patchy fog will be possible Tuesday morning into the early afternoon through the interior terminals as a more stable airmass enters, with conditions likely to deteriorate if fog moves over a terminal (IFR/LIFR).

KSEA...Ceilings are hovering right around 1000 ft with light rain and drizzle remain at the terminal. Southerly winds at 3-5 kt will switch to northerly at around 08Z and pick up into tomorrow morning at around 4-6 kt. Ceilings may (20% probability) lower Tuesday morning to around 400 ft from around 12-19Z. Ceilings will work their way up Tuesday with drizzle ending and ceilings rising up to 3000 ft by 00Z Wednesday.

LH

MARINE
Onshore flow will weaken tonight with increasing northwesterlies over the coastal waters. These northwesterlies will stay under Small Craft Advisory thresholds, but cannot rule out a gust or two above SCA, especially in the outer waters. A thermally induced trough will start to develop near the coastline by midweek then shift inland Friday into Saturday - with possible SCA easterlies through the Central and Eastern Strait on Thursday.

Coastal seas around 6 or 8 feet will continue tonight and through Tuesday. Seas will gradually subside back to around 4 to 6 feet by midweek.

Mazurkiewicz/LH

HYDROLOGY...No river flooding is expected through the next seven days.

SEW WATCHES/WARNINGS/ADVISORIES
WA...None.
PZ...None.

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Des Moines
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Mon -- 01:28 AM PDT     -0.81 feet Low Tide
Mon -- 07:09 AM PDT     Sunrise
Mon -- 08:13 AM PDT     11.50 feet High Tide
Mon -- 11:27 AM PDT     Moonset
Mon -- 01:45 PM PDT     4.81 feet Low Tide
Mon -- 06:46 PM PDT     Sunset
Mon -- 07:15 PM PDT     11.45 feet High Tide
Mon -- 08:19 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION

Des Moines, Washington, Tide feet

Duwamish Waterway
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Mon -- 01:31 AM PDT     -0.77 feet Low Tide
Mon -- 07:09 AM PDT     Sunrise
Mon -- 08:09 AM PDT     10.83 feet High Tide
Mon -- 11:28 AM PDT     Moonset
Mon -- 01:48 PM PDT     4.52 feet Low Tide
Mon -- 06:46 PM PDT     Sunset
Mon -- 07:11 PM PDT     10.78 feet High Tide
Mon -- 08:18 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION

Duwamish Waterway, Washington, Tide feet

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