Sunrise 6:11 AM   Sunset 8:04 PM Moonrise 1:48 PM   Moonset 3:39 AM

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PZZ135 Puget Sound And Hood Canal- 205 Pm Pdt Thu Apr 18 2024
Tonight - N wind 10 to 20 kt becoming 5 to 15 kt after midnight. Wind waves 1 to 3 ft. Fri - NE wind 5 to 15 kt. Wind waves 2 ft or less. Fri night - NE wind 10 to 20 kt becoming 5 to 15 kt after midnight. Wind waves 1 to 3 ft. Sat - NE wind to 10 kt becoming se 10 to 20 kt in the afternoon. Wind waves 1 ft or less building to 1 to 3 ft in the afternoon. Sat night - SW wind 20 to 30 kt. Wind waves 3 to 5 ft. Sun - SW wind 15 to 25 kt. Wind waves 2 to 4 ft. Sun night - W wind 5 to 15 kt becoming sw to 10 kt after midnight. Wind waves 2 ft or less. Mon - Light wind becoming N to 10 kt. Wind waves less than 1 ft becoming 1 ft or less. Tue - N wind to 10 kt. Wind waves 1 ft or less.

PZZ100 205 Pm Pdt Thu Apr 18 2024
Synopsis for the northern and central washington coastal and inland waters - High pressure will continue to develop and move towards the coast today, which will interact with low pressure over land. High pressure will to dominate through the end of the week, with the next frontal system not expected until Saturday.

FXUS66 KSEW 182102 AFDSEW

Area Forecast Discussion National Weather Service Seattle WA 202 PM PDT Thu Apr 18 2024

SYNOPSIS
Pleasant conditions tonight and Friday as an upper level ridge offshore moves across the area Friday. Slow moving frontal system brings the next chance for showers Saturday night into Sunday. Weak upper level ridge over Western Washington Monday into Tuesday replaced by a weak upper level trough Tuesday night and Wednesday.

SHORT TERM /TONIGHT THROUGH SUNDAY/
A very pleasant day across western Washington today with temps in the upper 50s to low 60s and clear skies. Dewpoints are a bit higher and with a little bit more wind overnight expected across the area, currently not expecting widespread frost, with low temperatures a touch warmer, in the upper 30s to low 40s, except in the low to mid 30s through the Southwest Interior.

Clear skies expected again tomorrow as a weak upper-level ridge moves into the region. With a thermal surface trough, winds will be primarily easterly, and may be a bit breezy through the gaps in the terrain. These conditions set up for a warmer day on Friday, with highs reaching into the upper 60s to lower 70s, especially through the Southwest interior up into the Cascade foothills south and west of Seattle (50-70% probabilities). Low temperatures will also be warmer, into the low to mid 40s.

An upper level trough will swing into the area Saturday into Sunday, bringing with it a surface low pressure system. With trough strongly negatively tilted, rain will work its way slowly from southwest to northeast. Rain will begin on the southwest coast Saturday morning with areas Seattle and north staying mostly dry until Saturday evening. Temperatures still above average, in the mid 60s, with offshore flow becoming southerly and breezy ahead of the front Saturday night into Sunday. Lows in the low to mid 40s.

Scattered showers continue across the region into Sunday. A few lightning strikes are possible late Saturday night into Sunday behind the frontal passage, but instability should be fairly limited and restricted to the Pacific coast. Sunday will be much closer to normal with high temperatures in the mid to low 50s.

With snow levels ranging from 5000 ft on Saturday down to around 3500 ft on Saturday, not expecting significant accumulations on the passes, with an inch or two possible on Stevens Pass and along the soon- to-be-open Route 20. Three- quarters to an inch of rain is possible along southwest facing portions of the Olympics and the North Cascades, with a tenth of an inch possible in the lowlands and up to a quarter of an inch along the coast.

LONG TERM /MONDAY THROUGH THURSDAY/
Deterministic and ensemble guidance both indicate an upper level ridge developing over the area on Monday for another warmer and drier period with highs back in the 60s. Tuesday should also be on the warm side mostly dry across the area. There is also good consensus on an upper level trough developing and moving into the area Tuesday night into Wednesday. Moisture looks to be be very limited, with only a handful of ensemble members showing the potential for rain making it into the interior Wednesday and beyond. Temperatures accordingly cool back closer to normal.

LH

AVIATION
Flow aloft will remain out of the northwest through the TAF forecast as an upper level ridge continues to build offshore. A thermal trough also remains positioned off the coast. Weather remains dry as well with VFR conditions/clear skies expected. A couple pockets of frost are possible overnight (although overnight temperatures are slightly warmer than the previous night) - but no fog is expected for Friday morning with dry grounds/upper level ridging. Gusty north winds up to 20 kt remain possible through Thursday afternoon - which will decrease to under 5 kt and become northeasterly for Friday - picking up again in the afternoon to 20 kt.

KSEA...VFR/clear skies through the TAF period. Gusty winds out of the north Thursday afternoon at 20 kt will diminish overnight to around 5 to 8 kt northeasterlies, and pick up out of the north again Friday.

HPR

MARINE
An upper level ridge will begin to move inland tonight/Friday. A thermal trough remains positioned off the coast of Washington. Northerly winds (with easterlies in the Strait of Juan de Fuca) will continue through Friday. Gusty winds to 20 kt have been observed in Puget Sound and central Strait of Juan de Fuca waters this afternoon, but are expected to remain largely under criteria needed for a small craft advisory. However, the next approaching system for this weekend will increase gradients in the central Strait of Juan de Fuca Friday (with stronger easterly winds to 25 kt). A small craft advisory was issued Friday morning through the evening. Additional gusty winds are possible Saturday and Sunday with the next system.

Seas remain around 3 to 6 ft through Saturday, before rising to 8 to 10 feet Sunday.

HPR

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

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

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Des Moines
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Thu -- 03:08 AM PDT     11.29 feet High Tide
Thu -- 04:39 AM PDT     Moonset
Thu -- 06:14 AM PDT     Sunrise
Thu -- 09:28 AM PDT     5.37 feet Low Tide
Thu -- 02:14 PM PDT     8.07 feet High Tide
Thu -- 02:47 PM PDT     Moonrise
Thu -- 08:03 PM PDT     Sunset
Thu -- 08:36 PM PDT     2.19 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION

Des Moines, Washington, Tide feet

Discovery Island
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Thu -- 12:43 AM PDT     1.33 knots Max Flood
Thu -- 03:44 AM PDT     -0.00 knots Slack
Thu -- 04:40 AM PDT     Moonset
Thu -- 06:15 AM PDT     Sunrise
Thu -- 07:21 AM PDT     -1.25 knots Max Ebb
Thu -- 11:51 AM PDT     0.00 knots Slack
Thu -- 01:16 PM PDT     0.36 knots Max Flood
Thu -- 02:48 PM PDT     Moonrise
Thu -- 02:51 PM PDT     -0.00 knots Slack
Thu -- 06:58 PM PDT     -1.20 knots Max Ebb
Thu -- 08:04 PM PDT     Sunset
Thu -- 10:45 PM PDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION

Discovery Island, 3.3 miles NE of, Washington Current, knots

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