Sunrise 6:21 AM   Sunset 7:54 PM Moonrise 7:01 PM   Moonset 5:08 AM

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PZZ133 Northern Inland Waters Including The San Juan Islands- 251 Pm Pdt Tue Apr 23 2024
Tonight - SW wind 5 to 15 kt becoming 10 to 20 kt after midnight. Wind waves 2 to 4 ft. Wed - SW wind 5 to 15 kt becoming S to 10 kt in the afternoon. Wind waves 1 ft or less. Wed night - S wind to 10 kt. Wind waves 1 ft or less. Thu - SE wind 5 to 15 kt. Wind waves 2 ft or less. Thu night - SE wind 10 to 20 kt becoming E 5 to 15 kt after midnight. Wind waves 2 ft or less. Fri - NE wind to 10 kt becoming W in the afternoon. Wind waves 1 ft or less. Fri night - S wind to 10 kt. Wind waves 1 ft or less. Sat - S wind to 10 kt. Wind waves 1 ft or less. Sun - S wind 5 to 15 kt becoming sw. Wind waves 2 ft or less.

PZZ100 251 Pm Pdt Tue Apr 23 2024
Synopsis for the northern and central washington coastal and inland waters - Surface high pressure well offshore along with a thermal trough to the south. A front is slated to reach the area Tuesday night into Wednesday followed by another system on Thursday. Active conditions look to continue late week into the weekend.

FXUS66 KSEW 240253 AFDSEW

Area Forecast Discussion National Weather Service Seattle WA 753 PM PDT Tue Apr 23 2024

SYNOPSIS
Weak front offshore moving inland Wednesday. This will mark the beginning of a cool and wet last week of April with an upper level trough over the area and a couple of systems moving through over the weekend and Monday. Snow levels will lower over the weekend to near 3000 feet Monday for possible snow on all the mountain passes the first part of next week.

SHORT TERM /TONIGHT THROUGH FRIDAY/
Forecast remains on track this evening as a mild evening continues for some of the interior.
Increasing high clouds already overhead with a transition to low- level onshore flow underway ahead of the next frontal system.
Previous discussion remains valid and follows.

Low level offshore flow will transition to onshore this evening with a weak surface ridge out ahead of the next frontal system.
Front moving slowly down from the northwest will still be offshore by 12z Wednesday. Rain out ahead of the front could reach the north coast early Wednesday morning. Increasing clouds overnight will keep low temperatures in the 40s.

Weakening front moving through Western Washington Wednesday. Front reaching the coast late morning moving through the interior in the afternoon before hanging up over the Cascades late in the afternoon. Not much in the way of rain with the front with most places getting less than a tenth of an inch. Main story for Wednesday will be the cooler high temperatures, 10 to 15 degrees cooler than Tuesday, in the mid to upper 50s.

Upper level trough over the area Wednesday night keeping a chance of showers in the forecast. Mostly cloudy skies and weak low level onshore flow will keep low temperatures in the mid to upper 40s.

Much more organized system moving into Western Washington Thursday with a half inch to an inch of rain along the coast with higher amounts over the Olympics and lesser amounts over the interior and the Cascades. Snow levels around 4500 feet so no snow in the lower passes. Highs Thursday remaining cool, in the mid 50s.

Front becoming a little negatively tilted with the associated surface low moving south along the coast. This will slow the eastward movement with frontal passage not until later Thursday night/early Friday morning. Another half to one inch of rain possible along the coast and in the Olympics with a quarter to a half inch elsewhere. Rainfall totals with this front will be about equal to the total rainfall so far for April in some places. Lows in the mid 40s.

Upper level trough moving over Western Washington behind the front Friday for more showers across the area. Not much in the way of cool air associated with the trough with snow levels remaining above 4000 feet. Highs Friday in the 50s.

LONG TERM /SATURDAY THROUGH TUESDAY/
Extended models in good agreement with a splitting front arriving over the weekend and another front on Monday. Very cool upper level trough settling into the area later Monday into Tuesday with 500 mb temperatures as low as -30C. Snow levels lowering to near 3000 feet Monday for the possibility of snow on all of the mountain passes Monday and Tuesday. Highs remaining below normal, in the 50s, with lows in the upper 30s to mid 40s. Felton

AVIATION
Winds aloft remain west-southwesterly into at least Wednesday morning as a broad upper-level trough approaches the area from the northwest. Surface winds generally west/northwesterly 5-10 kt at most terminals this evening before decreasing somewhat to 4-8 kts and shifting to the southwest tonight. Speeds expected to increase back to 5-10 kts Wednesday morning although direction will remain the same.

VFR conditions with mainly high clouds over W WA this evening, but will start to see cigs lower overnight as mid-level clouds start working into W WA ahead of the next system. Conditions will continue to erode as the system starts to enter the region by late Wednesday morning/early afternoon...however cigs are expected to remain largely within VFR criteria. The only exceptions to this may prove to be HQM and OLM. HQM being not only the westernmost terminal and thus first to be impacted but also being more prone to lower cigs may see MVFR to even possibly IFR conditions as early as the overnight hours and extending into the remainder of the TAF period.
Models remain in some disagreement with OLM, however latest trends also suggest MVFR conditions starting as early as overnight tonight or as late as late Wednesday morning. Will need take this recent trend into account for the 06Z TAF. Low model confidence in the prospect of precip Wednesday at current will prevent TAF mention at this time. Some sites contain VCSH to cover this and will leave that stand for the time being.

KSEA...VFR conditions expected through the TAF period. High clouds continue with increasing low-to-mid level cloud cover tonight. Winds WNW 5 to 10 kt this evening before a transition to light southerly tonight. Winds increase back to 5 to 10 kt but remain SW tomorrow. A few showers are possible but should be light and not impactful.

18/LH

MARINE
Weak thermal troughing continues to work onshore and dissipate as a weak front approaches the region from the northwest.
Winds in the Central Strait hitting SCA criteria while the East Entrance is seeing gusts that fall within criteria...but sustained have not quite ramped up just yet. Given the speeds being seen in the Central portion, fairly confident that these speeds will translate further eastward and as such, inherited Small Craft Advisory looks good and will remain unchanged. The aforementioned front will approach the area early tomorrow morning but will dissipate as it does so, leaving only scattered showers and minimal impacts. A more substantial system will move through the area waters on Thursday. At this time, winds look to remain under advisory thresholds. A weak surface ridge will momentarily ease wind speeds for Saturday before an active pattern re-emerges Sunday.

Seas look to remain 4 to 6 feet at about 10 seconds through the rest of the week and into Saturday.

LH/18



HYDROLOGY
No river flooding expected in the next 7 days.
Heavier rain over the south slopes of the Olympics Thursday and Thursday night could push the Skokomish River in Mason county close to action stage Friday. Felton

CLIMATE
With cool weather ahead for the end of the month the warmest day in April in Seattle will be 72 degrees on the 20th.
For only the 7th time in 80 years of records at Seattle Tacoma airport the warmest day in March, 74 degrees on the 16th, will be warmer than the warmest day in April. Other years this has occurred, 2019, 1995, 1994, 1969, 1964 and 1948. For those looking forward to warmer weather there has been at least one 80 degree plus day in Seattle in May in 11 out of the last 12 years.
Felton

SEW WATCHES/WARNINGS/ADVISORIES
WA...None.
PZ...Small Craft Advisory until 4 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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Peavine Pass
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Tue -- 04:45 AM PDT     7.48 feet High Tide
Tue -- 05:51 AM PDT     Moonset
Tue -- 06:04 AM PDT     Sunrise
Tue -- 11:00 AM PDT     0.00 feet Low Tide
Tue -- 04:51 PM PDT     Full Moon
Tue -- 06:43 PM PDT     7.08 feet High Tide
Tue -- 08:15 PM PDT     Sunset
Tue -- 08:26 PM PDT     Moonrise
Tue -- 11:06 PM PDT     4.38 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION

Peavine Pass, Washington, Tide feet

Peavine Pass
Click for MapFlood direction 55° true
Ebb direction 285° true

Tue -- 12:10 AM PDT     0.00 knots Slack
Tue -- 02:04 AM PDT     1.56 knots Max Flood
Tue -- 04:47 AM PDT     -0.00 knots Slack
Tue -- 05:51 AM PDT     Moonset
Tue -- 06:04 AM PDT     Sunrise
Tue -- 08:51 AM PDT     -3.14 knots Max Ebb
Tue -- 12:40 PM PDT     0.00 knots Slack
Tue -- 03:05 PM PDT     2.53 knots Max Flood
Tue -- 04:51 PM PDT     Full Moon
Tue -- 07:05 PM PDT     -0.00 knots Slack
Tue -- 08:15 PM PDT     Sunset
Tue -- 08:26 PM PDT     Moonrise
Tue -- 09:34 PM PDT     -1.65 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION

Peavine Pass, West Entrance of, Washington Current, knots

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