Sunrise 5:20 AM   Sunset 8:57 PM Moonrise 5:14 PM   Moonset 2:58 AM

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PZZ133 Northern Inland Waters Including The San Juan Islands- 126 Pm Pdt Mon May 20 2024
Tonight - SW wind 10 to 15 kt. Waves 1 to 2 ft. A slight chance of rain after midnight. Rain late. Tue - S wind 15 to 20 kt, becoming se 10 to 15 kt in the afternoon. Waves 1 to 2 ft. Rain.Tue night - SW wind 15 to 20 kt, becoming W 20 to 25 kt after midnight. Waves 1 to 2 ft, building to 2 to 3 ft after midnight. Showers likely. Wed - W wind 5 to 10 kt. Waves 2 to 3 ft, subsiding to 1 to 2 ft in the afternoon. A chance of showers in the morning. Wed night - S wind around 5 kt. Waves 1 foot or less. Thu - S wind 5 to 10 kt. Waves 1 foot or less. Thu night - S wind 5 to 10 kt. Waves 1 foot or less. A chance of showers after midnight. Fri - S wind 5 to 10 kt, becoming sw 10 to 15 kt in the afternoon. Waves 1 foot or less. Showers likely, mainly in the morning. Fri night - SW wind 5 to 10 kt. Waves 1 foot or less. A chance of showers. Sat - S wind 5 to 10 kt. Waves 1 foot or less. A chance of showers in the morning. Sat night - SW wind 5 to 10 kt. Waves 1 foot or less.

PZZ100 126 Pm Pdt Mon May 20 2024
Synopsis for the northern and central washington coastal and inland waters - Typical onshore flow with the strongest winds over the central and eastern strait during the afternoon and evening hours. A frontal system will traverse area waters on Tuesday with seas around 15 feet in the coastal waters Wednesday. Additional systems may develop and move through the region late this week.

FXUS66 KSEW 202207 AFDSEW

Area Forecast Discussion National Weather Service Seattle WA 307 PM PDT Mon May 20 2024

SYNOPSIS
Upper-level ridging has produced warmer and drier conditions today. But, troughing will arrive on Tuesday and Wednesday with a return of cooler and wetter weather. A brief dry break is possible on Thursday, before cool and unsettled conditions return Friday and may persist into the start of the weekend.

SHORT TERM /TONIGHT THROUGH THURSDAY/
Northerly flow aloft for much of the PNW as an upper-ridge noses into BC and far western Alberta. We've seen pleasant conditions across much of western WA due to its influence as dry and seasonal temperatures reign. Much of the same is in the forecast for this evening but, clouds will increase ahead of the next disturbance bringing widespread rain and cooler temperatures into Tuesday.

As mentioned, conditions are expected to deteriorate as early as the wee hours of the morning on Tuesday for the coast before spreading inland. By the morning rush hour, an upper-trough is expected to bring widespread rain across much of western Washington. This disturbance appears to be rather impressive for mid-late May. QPF forecasts indicate a half inch or more for much of the lowlands and 1 to 2 inches for both the Cascades and Olympics (including the coast) through Tuesday night. High temps are forecasted to be upwards of 10-12 F below average with values in the mid to upper 50s. Lingering showers with 4,000 ft snow levels are in the forecast for Wednesday as guidance hints at the upper-low centered directly over south-central WA and north- central OR. We'll warm up slightly but still running cooler than normal with highs in the upper 50s to lower 60s. Overnight lows are to fall into the 40s for both nights.

Thursday will be a bit of a transition day with transient ridging sliding overhead. We'll see a brief return of drier conditions along with near average temperatures. However, it won't be long lasting as unsettled conditions return soon after.

LONG TERM /FRIDAY THROUGH MONDAY/
The next upper-low looks to arrive on Friday with another round of precipitation of cooler conditions. Chance PoPs and below normal temperatures continue into the weekend as the region remains under the influence of troughing aloft. Ensemble guidance hinting at a possible shift in the pattern early next week with upper ridging rebounding over the Intermountain West and upper troughing positioned over the Gulf of Alaska and NE Pacific.

McMillian

AVIATION
North-northwesterly flow aloft as an upper level trough exits the region and a weak positively tilted ridge builds in its wake. VFR conditions across the region with broken cloud cover along the coast and over the Cascades. Expect VFR conditions to continue through the evening. A frontal system will approach from the northwest, bringing with it rain showers and MVFR ceilings area- wide. Widespread rain will approach the coast early this evening, spreading inland through the overnight hours. Some local IFR conditions may be possible, in particular along the coast.

Onshore/westerly flow will continue through this evening, becoming more south/southwesterly tonight as the system approaches. Winds will pick up tomorrow, with gusty winds possible, in particular through the interior terminals.

KSEA...VFR conditions this afternoon with scattered cloud cover. VFR conditions continue through early this evening with increasing clouds. MVFR conditions and rain showers beginning around 12Z Tuesday and persisting through the day tomorrow. Westerly winds becoming southerly this evening around 4 to 8 kt, increasing 10 to 15 kt tomorrow, with gusts to 25 kt possible as the system passes through the region.

LH



MARINE
High pressure over the NE Pacific will maintain onshore flow across western WA this week. Very typical to the pattern, the strongest winds are expected through the Strait of Juan de Fuca especially during the afternoon and evening hours. - Small Craft Advisories are in effect. A frontal system will cross the waters on Tuesday which will boost winds and seas. Combined seas over the coastal waters are expected to rise to near 15 feet by Wednesday especially over the northern coastal zones. Another frontal system may pass through area waters on Friday.



HYDROLOGY
The daily hydrology discussion has ended until the start of the next rainy season; it will only be updated as needed.



SEW WATCHES/WARNINGS/ADVISORIES
WA...None.
PZ...Small Craft Advisory until 5 AM PDT Tuesday for Central U.S.
Waters Strait Of Juan De Fuca-East Entrance U.S. Waters Strait Of Juan De Fuca.

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Samuel Island (North Shore)
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Mon -- 03:47 AM PDT     11.51 feet High Tide
Mon -- 03:58 AM PDT     Moonset
Mon -- 05:24 AM PDT     Sunrise
Mon -- 10:56 AM PDT     4.24 feet Low Tide
Mon -- 06:14 PM PDT     Moonrise
Mon -- 06:30 PM PDT     11.36 feet High Tide
Mon -- 08:55 PM PDT     Sunset
Mon -- 10:49 PM PDT     9.70 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION

Samuel Island (North Shore), British Columbia, Tide feet

Boat Passage
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Mon -- 02:16 AM PDT     -0.01 knots Slack
Mon -- 03:58 AM PDT     Moonset
Mon -- 05:24 AM PDT     Sunrise
Mon -- 05:53 AM PDT     -3.82 knots Max Ebb
Mon -- 09:04 AM PDT     0.00 knots Slack
Mon -- 12:23 PM PDT     3.96 knots Max Flood
Mon -- 04:02 PM PDT     -0.00 knots Slack
Mon -- 06:13 PM PDT     Moonrise
Mon -- 06:47 PM PDT     -2.58 knots Max Ebb
Mon -- 08:55 PM PDT     Sunset
Mon -- 09:41 PM PDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION

Boat Passage, British Columbia Current, knots

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