Sunrise 5:51 AM   Sunset 8:21 PM Moonrise 12:11 AM   Moonset 7:24 AM

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PZZ133 Northern Inland Waters Including The San Juan Islands- 321 Am Pdt Sun Apr 28 2024
Today - S wind 5 to 15 kt becoming sw 10 to 20 kt in the afternoon. Wind waves 1 to 3 ft. Tonight - SW wind 10 to 20 kt becoming 5 to 15 kt after midnight. Wind waves 1 to 3 ft. Mon - SW wind 5 to 15 kt. Wind waves 2 ft or less. Mon night - S wind 5 to 15 kt. Wind waves 2 ft or less. Tue - SE wind to 10 kt becoming sw in the afternoon. Wind waves 1 ft or less. Tue night - SW wind 5 to 15 kt. Wind waves 2 ft or less. Wed - S wind to 10 kt. Wind waves 1 ft or less. Thu - SE wind to 10 kt becoming sw. Wind waves 1 ft or less.

PZZ100 321 Am Pdt Sun Apr 28 2024
Synopsis for the northern and central washington coastal and inland waters - Unsettled weather continues with gusty southwesterly flow over the area waters today. The next frontal system will move across the region Monday with weak high pressure building across the region Tuesday and Wednesday. Yet another front looks to cross the area waters Thursday.

FXUS66 KSEW 281608 AFDSEW

Area Forecast Discussion National Weather Service Seattle WA 908 AM PDT Sun Apr 28 2024

SYNOPSIS
Unsettled weather continues with a series of frontal systems crossing the region through the middle of the week. The pattern will dry out some mid week with somewhat warmer temperatures returning.

SHORT TERM /TODAY THROUGH TUESDAY/
Upper trough poised offshore will swing onshore tonight and Monday. This will destabilize the atmosphere for an increase in shower activity, isolated thunderstorms, and lowering snow levels. A decent southerly gradient ahead of the trough will contribute to breezy conditions today...especially through Puget Sound and the strait. No updates to the forecast are anticipated this morning. Previous discussion follows with updates to marine and aviation portions. 27

An occluded front passed through the region yesterday, that brought showers across the region. Post front, there are a few bands of showers still on radar in the Cascades and along the coast this morning (via a couple of surface troughs in these regions). Between systems (with an approaching shortwave trough from Canada), the showers will remain isolated through the Sunday morning hours, and begin to increase in coverage this afternoon as an upper-level low tracks southward from Canada by Monday. This system is unusually cold aloft for a late April system, with 500 mb temperatures down at -35 C, which has some implications for the impacts expected in the next 48 hours.

The precipitation Sunday/Monday breaks down into higher elevations,and lower elevations. For highland areas (Cascades and Olympics), the cool air aloft is expected to work its way towards the surface tonight/Monday morning, with morning lows expected to be in the low 30s and upper 20s. This will drop snow levels to just under 2,000 feet. Southwest/west flow aloft is expected to tap moisture (in addition to a jet max driving moisture from the Pacific via westerlies).

All things considered, snow will be the primary precipitation falling in the mountains from Sunday through Monday. A Winter Weather Advisory continues for the Cascades at elevations greater than 3,500 feet for moderate snowfall amounts, though impacts may be enhanced given the late season timing of this system. With cold air coming from the north, the precipitation should transition from rain to snow during the late Sunday evening/Monday morning time frame. When all set and done, most areas will likely see 4 to 8 inches of snow (despite the warmer surfaces that may compact some of the snow down on the surface). There's a 20% chance that snowfall at Snoqualmie and Stevens Pass exceeds 6 inches. There still will be some snow flakes for areas between 2,000 feet and 3,500 feet (i.e. Snoqualmie Pass), but the snow is not expected to stick on roadways. For areas in the advisory (including Stevens Pass), minor travel impacts are expected due to slick roads.

For the lowlands, post frontal isolated showers are expected to increase this afternoon as the low approaches from Canada. There's a slight chance for thunder this afternoon, which may be limited due to slightly warmer temperatures aloft today. With the cooler air aloft in place on Monday (along with 200 J/kg CAPE, 0-3 km SRH around 100 m2s2, and 40 kt of 0-6 km shear), the thunder chances will be significantly greater. Some of the stronger storms may be able to produce small hail and gusty winds. Again, coverage will be scattered, with breaks in between bands/clusters of showers.

Tuesday will start to gradually dry out as the low departs the region to the southeast. Expect high temperatures in this period to top out in the mid 50s in the low lands, with 40s in the highlands. Southwest winds will remain light around 5 to 10 mph, with higher gusts possible near waterways today, however.

LONG TERM /WEDNESDAY THROUGH SATURDAY/
The drying trend from Tuesday continues into Wednesday with a break in troughs. There still some uncertainty as to if a trough will pass through on Thursday with showers, but it appears that ensembles/deterministic models are pointing towards Friday being dry (via a ridge), and potentially a trough passing through Saturday with showers.
Temperatures will start to increase on Wednesday through the remainder of the week, with highs in the low 60s for lowlands (50s for mountains), and lows in the 40s. Winds will remain light.

HPR

AVIATION
West-southwest flow aloft as upper-level troughing remains anchored over the northeastern Pacific. Southwest surface flow once again today with a 70% chance for wind gusts to 20 kt at the Puget Sound terminals and HQM from 18 to 02Z.

A mix of VFR and MVFR so far this morning. Mostly VFR with CIGs from 3000-4000 feet generally this afternoon with a gradual lowering to MVFR levels possible (35% chance) after 06Z this evening for the Puget Sound terminals. Scattered showers with a lightning strike or two possible this afternoon and evening thanks to the weak instability associated with the aforementioned troughing over the Pacific Northwest.

KSEA...MVFR this morning, with breezy southwest winds from 10 to 15 kt. Expect CIGs to gradually rise to 3000 to 4000 feet this afternoon with southerly wind gusts developing once again. There's currently a 70% chance for wind gusts of at least 20 kt from 18-02Z.
CIGs look to lower after 06Z tonight with a 40% chance for MVFR.

Davis/McMillian

MARINE
Unsettled conditions continue over the area waters with breezy to windy conditions today as another round of Small Craft Advisories go into affect later this morning for Puget Sound as southerly winds increase and through the central and East Strait of Juan de Fuca as westerly flow strengthens. Steep seas from 6 to 8 feet will build to 8 to 10 feet this afternoon. Scattered showers and thunderstorms will be possible over the area waters this afternoon and Monday afternoon, with brief and localized wind gusts to SCA thresholds possible, though not widespread enough to warrant advisories at this time over the coastal waters.

Seas remain elevated through Tuesday from 8 to 10 feet followed by a gradual decrease to 4 to 6 feet into the latter portion of the week.

Davis

HYDROLOGY
No river flooding is anticipated over the next seven days.

SEW WATCHES/WARNINGS/ADVISORIES
WA...Winter Weather Advisory from 11 PM this evening to 11 AM PDT Monday 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 5 AM PDT early this morning for Central U.S. Waters Strait Of Juan De Fuca-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-East Entrance U.S. Waters Strait Of Juan De Fuca.

Small Craft Advisory from 11 AM this morning to 5 AM PDT Monday for Central U.S. Waters Strait Of Juan De Fuca.

Small Craft Advisory from 1 PM this afternoon to 5 AM PDT Monday for East Entrance U.S. Waters Strait Of Juan De Fuca.

Small Craft Advisory from 8 AM this morning to 8 PM PDT this evening for Puget Sound and Hood Canal.

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La Conner
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Sun -- 01:10 AM PDT     Moonrise
Sun -- 03:17 AM PDT     7.17 feet Low Tide
Sun -- 05:54 AM PDT     Sunrise
Sun -- 07:21 AM PDT     8.89 feet High Tide
Sun -- 08:24 AM PDT     Moonset
Sun -- 03:17 PM PDT     -1.29 feet Low Tide
Sun -- 08:20 PM PDT     Sunset
Sun -- 10:46 PM PDT     10.05 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION

La Conner, Washington, Tide feet

Deception Pass
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Sun -- 01:08 AM PDT     0.02 knots Slack
Sun -- 01:11 AM PDT     Moonrise
Sun -- 03:52 AM PDT     3.56 knots Max Flood
Sun -- 05:53 AM PDT     -0.00 knots Slack
Sun -- 05:55 AM PDT     Sunrise
Sun -- 08:24 AM PDT     Moonset
Sun -- 09:43 AM PDT     -6.52 knots Max Ebb
Sun -- 12:30 PM PDT     0.05 knots Slack
Sun -- 04:25 PM PDT     5.87 knots Max Flood
Sun -- 07:56 PM PDT     -0.00 knots Slack
Sun -- 08:21 PM PDT     Sunset
Sun -- 10:50 PM PDT     -5.79 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION

Deception Pass, Washington Current, knots

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