Sunday, April18, 2021
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Marine Weather and Tides
Federal Way, WA

Version 3.4
NOTICE
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:12AMSunset 8:04PM Sunday April 18, 2021 2:06 PM PDT (21:06 UTC) Moonrise 9:06AMMoonset 12:56AM Illumination 44% Phase: First Quarter Moon; Moon at 7 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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PZZ135 Puget Sound And Hood Canal- 905 Am Pdt Sun Apr 18 2021
Today..Light wind becoming N to 10 kt in the afternoon. Wind waves 1 ft or less.
Tonight..NW wind 5 to 15 kt. Wind waves 2 ft or less.
Mon..NE wind 5 to 15 kt becoming N in the afternoon. Wind waves 2 ft or less.
Mon night..N wind to 10 kt becoming ne after midnight. Wind waves 1 ft or less.
Tue..N wind to 10 kt becoming 5 to 15 kt in the afternoon. Wind waves 2 ft or less.
Tue night..N wind to 10 kt becoming nw after midnight. Wind waves 1 ft or less.
Wed..Light wind becoming variable to 10 kt. Wind waves less than 1 ft becoming 1 ft or less.
Thu..Light wind becoming sw to 10 kt. Wind waves less than 1 ft becoming 1 ft or less.
PZZ100 905 Am Pdt Sun Apr 18 2021
Synopsis for the northern and central washington coastal and inland waters..Surface high pressure over the area this weekend with light offshore flow. Onshore flow is expected to develop late Monday and persist into mid week.


7 Day Forecast for Marine Location Near Federal Way, WA
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location: 47.33, -122.34     debug


Area Discussion for - Seattle, WA
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FXUS66 KSEW 181553 AFDSEW

Area Forecast Discussion National Weather Service Seattle WA 852 AM PDT Sun Apr 18 2021

SYNOPSIS. A transition to onshore flow today will cool off the coast but not make much headway into the interior. This gradual cooling will become more widespread Monday. As an upper level ridge remains in place, dry conditions will persist although systems passing near the area will allow for an increase in clouds over the first half of the week. A pattern change is still expected for the end of the week with a return to cooler and wetter conditions.

SHORT TERM /TODAY THROUGH TUESDAY/. Generally clear skies in place again over W WA this mid-morning although lingering high clouds may be present from early this morning in some spots. Temps, on average, about where they were 24 hours ago although some locations are a degree or two cooler than yesterday, others a degree or two warmer. On the cooler side of that are the coastal locations and they should maintain or increase that gap as the day progresses as surface flow is expected to transition to onshore today. Current obs show this has not occurred yet though, with calm conditions at UIL and a weak easterly wind at HQM.

Upper level ridging remains the main headline for the short term period, keeping dry conditions in place. The aforementioned transition to onshore flow at the surface will be responsible for a gradual cooling trend starting today but becoming more widespread Monday as temps for the first work day of the week fall to around 60 along the coast and into the upper 60s to around 70 for the interior lowlands.

A shortwave trough evolves into a small closed low Monday night into Tuesday but is not expected to make much of an impact to W WA given both its sharp SE trajectory taking it south of the area as well as the fact there is very little moisture associated with it. The largest expected impact will be an increase in cloud cover over the western half of the CWA into Tuesday morning. Upper level ridging rebuilds over the nearshore coastal waters, clearing these clouds out Tuesday afternoon although the gradual cooling will remain in place as temps will be be a degree or two cooler than Monday.

Inherited forecast handles the discussed items pretty well, thus no need for a morning update. 18

LONG TERM /WEDNESDAY THROUGH SATURDAY/. From Previous Discussion . The synoptic pattern at the beginning of the long term period will feature a ridge of high pressure just offshore the West Coast, with slight influence extending into the Pacific Northwest. Onshore flow will continue in the low levels as high pressure continues over the Pacific. Wednesday will be dry and mostly sunny despite some marine stratus over portions of the interior and Coast in the morning. High will be around 70 in the interior and around 60/upper 50s near the Coast. Synoptically, a noticeable deepening of a longwave trough will take place over the Northern Canada on Wednesday, which will then help push a shortwave through the area on Thursday. This shortwave will push the upper level ridge westward and may even bring a few showers to the northern counties during the day. Can expect much more cloud cover on Thursday as the marine stratus should also be able to push into most lowland locations by daybreak.

Troughing looks to become better established over the Western US as this shortwave continues southward into Friday. There is some discrepancy noted in the ensemble guidance in regards to more trough vs ridge influence over the Pacific Northwest on Friday. The WPC cluster analysis mean would argue more in favor of a trough, with better ridging located just offshore. If this trend continues, we could be looking at the return of rain to the forecast at the end of the week. Have introduced slightly higher rain chances into the forecast for Friday. A more complete breakdown of the upper level ridge appears increasingly likely into the weekend, with the return of the all-too-familiar Pacific trough. A wet weekend currently appears in store.

Kovacik

AVIATION. Upper ridge will weaken over the region today with increasing northwest flow aloft as an upper level disturbance passes to the east of the area later today and tonight. Low level offshore flow will continue. The air mass will be stable and dry. The air mass will become slightly unstable this afternoon over the north Cascades with some mid and high level moisture as the upper short wave clips the area. Stratus will push north along or just off the coast during the day today. 27

KSEA . Clear skies. Surface winds light and variable becoming northwesterly 7 knots or less this afternoon. Winds will remain out of the north or northeast through the overnight hours before becoming southeasterly between 12 and 15Z Monday morning.

Pullin

MARINE. Offshore flow today for the interior but a weak flow reversal will occur along the coast. Weak offshore flow will continue on Monday then onshore flow will gradually increase through the middle of next week. 27

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

SEW WATCHES/WARNINGS/ADVISORIES. WA . None. PZ . Small Craft Advisory from 11 PM this evening to 11 AM PDT Monday for Coastal Waters From Cape Flattery To James Island Out 10 Nm-West Entrance U.S. Waters Strait Of Juan De Fuca.

Small Craft Advisory from 8 PM this evening to 11 AM PDT Monday for Northern Inland Waters Including The San Juan Islands.



www.weather.gov/seattle


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
TCMW1 - 9446482 - Tacoma Met, WA 6 mi49 min NW 1.9 G 4.1
TCNW1 - 9446484 - Tacoma, WA 6 mi55 min 66°F 48°F1021.4 hPa
WPOW1 - West Point, WA 23 mi67 min WSW 1 G 1.9 61°F 1021.2 hPa (-0.8)47°F

Wind History for Tacoma MET, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Seattle, Seattle-Tacoma International Airport, WA8 mi74 minWSW 410.00 miA Few Clouds72°F41°F33%1021.6 hPa
Renton Municipal Airport, WA13 mi74 minN 410.00 miFair72°F43°F35%1021 hPa
Tacoma, Tacoma Narrows Airport, WA13 mi74 minSW 410.00 miFair69°F42°F38%1020.9 hPa
Boeing Field - King County International Airport, WA14 mi74 minN 010.00 miFair71°F40°F32%1020.7 hPa
Tacoma / McChord Air Force Base, WA14 mi69 minW 510.00 miFair74°F36°F25%1021.3 hPa
Pierce County-Thun Field, WA16 mi72 minWSW 610.00 miFair75°F36°F24%1021.3 hPa
Fort Lewis / Gray U. S. Army Airfield, WA21 mi69 minW 410.00 miFair76°F33°F21%1021 hPa

Link to 5 minute data for KSEA

Wind History from SEA (wind in knots)
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Last 24hrW4W7NW7N4N3N5NW6N5N4N5E5S3S3SE5SE4SE5SE3S4S4CalmCalmW53W4
1 day agoN8NW7N11N10N14N12N10N10N11NE12CalmCalmNE5E5N4NE4N4CalmCalmW3Calm3W5W5
2 days agoN10NW10N14N15N15N11N8NE12NE13NE5N5E3SE4CalmCalmSE3--CalmNE4N4N5N7N9N9

Tide / Current Tables for Des Moines, Washington
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Des Moines
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Sun -- 01:56 AM PDT     Moonset
Sun -- 04:14 AM PDT     7.39 feet Low Tide
Sun -- 06:14 AM PDT     Sunrise
Sun -- 08:30 AM PDT     9.21 feet High Tide
Sun -- 10:04 AM PDT     Moonrise
Sun -- 04:09 PM PDT     0.36 feet Low Tide
Sun -- 08:03 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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10.49.78.77.87.47.68.18.79.19.18.67.45.842.310.40.723.85.87.89.510.5

Tide / Current Tables for Skagit Bay, 1 mile S of Goat Island, Washington Current
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Skagit Bay
Click for Map
Sun -- 01:16 AM PDT     0.02 knots Slack
Sun -- 01:57 AM PDT     Moonset
Sun -- 03:47 AM PDT     0.91 knots Max Flood
Sun -- 06:14 AM PDT     -0.01 knots Slack
Sun -- 06:15 AM PDT     Sunrise
Sun -- 10:06 AM PDT     Moonrise
Sun -- 10:10 AM PDT     -1.15 knots Max Ebb
Sun -- 12:36 PM PDT     0.04 knots Slack
Sun -- 04:21 PM PDT     1.51 knots Max Flood
Sun -- 08:04 PM PDT     Sunset
Sun -- 08:26 PM PDT     -0.00 knots Slack
Sun -- 11:19 PM PDT     -1.04 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.8-0.40.50.80.90.80.3-0.7-0.9-1.1-1.1-1.1-0.70.61.11.31.51.51.30.90.4-0.6-0.9-1

Weather Map
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GEOS Local Image of PacificNorthwest    EDIT
NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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