Sunrise 5:47 AM   Sunset 8:23 PM Moonrise 2:14 AM   Moonset 11:10 AM

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PZZ135 Puget Sound And Hood Canal- 239 Pm Pdt Tue Apr 30 2024
Tonight - N wind 5 to 15 kt becoming S after midnight. Wind waves 2 ft or less. Wed - S wind to 10 kt. Wind waves 1 ft or less. Wed night - SW wind to 10 kt becoming N after midnight. Wind waves 1 ft or less. Thu - N wind to 10 kt rising to 5 to 15 kt in the afternoon. Wind waves 2 ft or less. Thu night - NW wind to 10 kt becoming S after midnight. Wind waves 2 ft or less. Fri - S wind 5 to 15 kt becoming sw 10 to 20 kt in the afternoon. Wind waves 1 to 3 ft. Fri night - SW wind 5 to 15 kt becoming S to 10 kt after midnight. Wind waves 2 ft or less. Sat - NW wind to 10 kt becoming sw. Wind waves 1 ft or less. Sun - S wind 5 to 15 kt. Wind waves 2 ft or less.

PZZ100 239 Pm Pdt Tue Apr 30 2024
Synopsis for the northern and central washington coastal and inland waters - Low level flow becoming onshore tonight with surface high pressure building over the coastal waters. System moving southeast through the coastal waters Wednesday night moving into northern oregon early Thursday morning. Weak high pressure over the waters Thursday night into Friday. NExt system splitting as it moves into the waters Friday night into Saturday. Another system arriving late in the weekend.

FXUS66 KSEW 010324 AFDSEW

Area Forecast Discussion National Weather Service Seattle WA 823 PM PDT Tue Apr 30 2024

SYNOPSIS
Shower activity will taper off overnight with unusually cool temperatures and areas of frost by Wednesday morning. Another weak system will slide to our south on late Wednesday into early Thursday. Drier and slightly warmer conditions are expected Thursday and Friday before more precipitation arrives late Friday and Saturday.

SHORT TERM /TONIGHT THROUGH FRIDAY/
Current radar is not terribly impressive although there are some scattered showers out there.
Cells are mainly focused on eastern Grays Harbor county as well as along the Cascade foothills. Radar loop indicates that these cells are uniformly moving south and weakening as they do so. Switching gears to visible satellite, can definitely see some pretty impressive convection which would imply more activity that what radar is conveying. The fact that there have been no lightning strikes in some time would certainly seem to side more with the story that radar is telling as opposed to satellite...but will continue to monitor. While will opt to not rehash forecast in this discussion, it is worth noting that aside from those two areas of showers, W WA is seeing clouds clear out of much of the CWA ..which would put things on track for the cold conditions expected tonight.
Current obs reporting dewpoints in the 30s also help to reaffirm this assessment.

As such, no evening updates expected as inherited forecast looks good. For forecast details, please refer to the Previous Discussion section below.

From Previous Discussion...A low pressure system continues to progress east near Portland this afternoon. Isolated to scattered showers continue to wrap around this system and will gradually taper off through this evening. A stray thunderstorm or two still cannot be ruled out this afternoon, with the highest chances closer to Portland. Clearing skies and a cooler airmass will result in areas with temperatures reaching into the low to mid 30s tonight allowing for areas of frost development. A Frost Advisory remains in effect for tonight.

A weak system will slide mainly south of the area late Wednesday into early Thursday bringing another window of possible shower activity, mainly south and west of Seattle. This will be followed by transient ridging Thursday into early Friday allowing temperatures to warm into the 60s Thursday and Friday. The next system will begin to spread precipitation across the area Friday afternoon and evening.

LONG TERM /SATURDAY THROUGH TUESDAY/
From Previous Discussion...A broad upper level low will make its way to the coast Friday night.
Cluster analysis continues to indicate disagreement in the evolution of this low.
Roughly half of the members take the bulk of the low and associated precipitation to the south while the other half keep a more progressive pattern moving the system across Washington fairly quickly but with heavier rainfall. In either case, the system will be associated with at least some precipitation and wet conditions are likely late Friday through Saturday.

Beyond the early weekend system, zonal flow and at least semi- active weather is expected to continue. This will keep temperatures in check and a chance of precipitation in the forecast.
-Wolcott-

AVIATION
An upper level trough will continue to shift eastward into Wednesday, with light northerly flow aloft. Low-level flow remains northerly this evening, but returns to onshore again late tonight. Some scattered showers mostly near the Cascades and few downwind of the Olympics this evening, but these should fade away by 06z. Enough surface wind overnight may preclude widespread poor visibility, but expect patchy restrictions after 12z in the wind sheltered locations both northwest and southwest interior regions.
Otherwise, streaming mid level clouds likely to increase after 15z Wednesday morning.

KSEA...Ceilings near 4000 feet this evening with skies clearing overnight. Increasing middle level clouds after 14z, but VFR conditions likely (greater than 70% chance) to continue. North surface wind around 7 kt this evening becoming southerly by 08z and continuing so overnight and through the period. Cullen

MARINE
Low level flow becoming onshore tonight with surface high pressure building over the coastal waters. System moving southeast through the coastal waters Wednesday night moving into Northern Oregon early Thursday morning. Weak high pressure over the waters Thursday night into Friday. Next system splitting as it moves into the waters Friday night into Saturday. Another system arriving late in the weekend.

Small craft advisory westerlies in the Central and Eastern Strait late tonight into early Wednesday morning.

Seas near 10 feet tonight subsiding to 6 or 7 feet early Wednesday morning. Felton

HYDROLOGY
No river flooding is expected over the next 7 days.

SEW WATCHES/WARNINGS/ADVISORIES
WA...Frost Advisory until 10 AM PDT Wednesday for East Puget Sound Lowlands-Everett and Vicinity-Hood Canal Area-Lower Chehalis Valley Area-Southwest Interior-Tacoma Area.

PZ...Small Craft Advisory from 11 PM this evening to 5 AM PDT Wednesday for Central U.S. Waters Strait Of Juan De Fuca- East Entrance U.S. Waters Strait Of Juan De Fuca.

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Seattle
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Wed -- 12:23 AM PDT     11.38 feet High Tide
Wed -- 03:15 AM PDT     Moonrise
Wed -- 04:27 AM PDT     Last Quarter
Wed -- 05:51 AM PDT     Sunrise
Wed -- 06:15 AM PDT     7.32 feet Low Tide
Wed -- 10:00 AM PDT     8.29 feet High Tide
Wed -- 12:11 PM PDT     Moonset
Wed -- 05:27 PM PDT     0.08 feet Low Tide
Wed -- 08:22 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION

Seattle, Washington, Tide feet

Alki Point
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Wed -- 12:04 AM PDT     -0.00 knots Slack
Wed -- 02:58 AM PDT     -0.34 knots Max Ebb
Wed -- 03:15 AM PDT     Moonrise
Wed -- 04:27 AM PDT     Last Quarter
Wed -- 05:51 AM PDT     Sunrise
Wed -- 08:36 AM PDT     -0.02 knots Min Ebb
Wed -- 12:11 PM PDT     Moonset
Wed -- 02:00 PM PDT     -0.47 knots Max Ebb
Wed -- 05:49 PM PDT     0.00 knots Slack
Wed -- 08:22 PM PDT     Sunset
Wed -- 09:01 PM PDT     0.62 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION

Alki Point, 0.3 miles W of, Washington Current, knots

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