Monday, April19, 2021
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Marine Weather and Tides
SeaTac, 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 6:10AMSunset 8:06PM Monday April 19, 2021 8:32 PM PDT (03:32 UTC) Moonrise 10:02AMMoonset 1:47AM Illumination 57% Phase: First Quarter Moon; Moon at 8 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- 226 Pm Pdt Mon Apr 19 2021
Tonight..NE wind to 10 kt. Wind waves 1 ft or less.
Tue..N wind to 10 kt. Wind waves 1 ft or less.
Tue night..N wind to 10 kt. Wind waves 1 ft or less.
Wed..N wind to 10 kt. Wind waves 1 ft or less.
Wed night..N wind to 10 kt in the evening becoming light. Wind waves 1 ft or less.
Thu..Light wind becoming S to 10 kt in the afternoon. Wind waves 1 ft or less.
Thu night..SW wind to 10 kt in the evening becoming light. Wind waves 1 ft or less.
Fri..SW wind to 10 kt. Wind waves 1 ft or less.
Sat..Light wind becoming S to 10 kt. Wind waves less than 1 ft becoming 1 ft or less.
PZZ100 226 Pm Pdt Mon Apr 19 2021
Synopsis for the northern and central washington coastal and inland waters..Onshore flow will develop and tonight and persist through the week due to high pressure over the ne pacific. Highest wind and waves will be found over the outer coastal waters and the strait of juan de fuca.


7 Day Forecast for Marine Location Near SeaTac, WA
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location: 47.42, -122.28     debug


Area Discussion for - Seattle, WA
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FXUS66 KSEW 200326 AFDSEW

Area Forecast Discussion National Weather Service Seattle WA 826 PM PDT Mon Apr 19 2021

UPDATE. The current forecast remains on track and changes are not scheduled for this evening.

PREV DISCUSSION. /issued 245 PM PDT Mon Apr 19 2021/

SYNOPSIS . Dry and relatively warm conditions will continue most of this week as upper level high pressure remains in place. Onshore flow will slowly strengthen throughout the week, with increasing cloud cover and cooler temperatures likely the latter half of the week. A pattern change is expected this weekend with an organized frontal system bringing rain back to the area.

SHORT TERM /TONIGHT THROUGH THURSDAY/ . Still some lingering clouds over the coast and perhaps a little further east as per current satellite. Temperatures remain on average 3 to 5 degrees cooler than yesterday, although some locations, such as Port Angeles and Shelton, are running 7 to 9 degrees cooler than 24 hours ago.

Zooming out to the big picture, upper level ridging remains in place over W WA for much of the short term. A weak shortwave disturbance off the coast will plunge southeastward late this afternoon and evening but will prove to be too far south to have any influence. As such, little in the way in changes to sky cover expected in the short term . clear skies expected to persist for much of the area while coastal locations will likely start off each day with some morning stratus before breaking up by afternoon. Otherwise, the ridge will gradually lessen in intensity Tuesday and Wednesday. This, combined with continued weak onshore flow will keep daytime highs steady with lower to mid 60s along the coast, lower 70s inland.

Thursday sees an upper level trough sagging down from British Columbia, but it looks to be more of an issue for E WA . however, enough moisture associated with this front might nick the far northeastern corner of the CWA, bringing some PoPs back to the area, albeit slight chance. This feature will allow for a drop in temperatures though, as afternoon highs in the lowlands will fall to the mid 60s. Temps along the coast will not see much of a change though, remaining in the mid to upper 50s.

LONG TERM /FRIDAY THROUGH MONDAY/ . Models continue to agree that the upper level ridge looks to be on its last legs by the time Friday rolls around, sandwiched in between the aforementioned trough and another frontal system just off the coast. This system will push onto the coast and into W WA late Friday/early Saturday. Rain will remain in the forecast into Sunday as the parent upper low slowly moves eastward. Both deterministic models and ensembles have a difficult time agreeing on the track of this low and how much precip can be expected for the start of next week, but given the spread of ensemble members, would be more inclined to lean more toward wetter and more active solutions and thus keeping PoPs in the forecast.

Temps during this time frame return to closer to seasonal normals with lowland afternoon highs in the lower 60s for Friday, mid 50s for Saturday and a slight recovery to the upper 50s to around 60 for both Sunday and Monday.

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AVIATION . High pressure will lead to dry and stable weather across western WA. The low level flow will turn more NW/W and onshore tonight with stratus clouds pushing inland once again (mainly into the lower Chehalis gap). Elsewhere, expect VFR conditions tonight and Tuesday with mainly mid and high level clouds.

KSEA . VFR through the period with light and variable wind 5 kt or less tonight. Northwesterly winds will resume after daybreak with speeds between 4-7 kts.

33/Pullin

MARINE . Onshore flow will develop tonight and persist through the week due to high pressure over the NE Pacific. Highest wind and waves will be found over the outer Coastal Waters and the Strait of Juan de Fuca.

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FIRE WEATHER . Fire weather concerns will remain elevated through mid week as high pressure influence continues over the area. This will keep temps above seasonal normals each afternoon under mostly clear skies as dry conditions persist. Finer fuels (10hr and 100hr fuels) expected to remain in the 5-15% range, which will yield quick fire starts if ignited. Strengthening onshore flow by Thursday, accompanied with increased cloud cover and cooler temperatures will begin to alleviate fire concerns, with a pattern change expected by the weekend that will bring widespread rain to the area.

Kovacik/18

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

www.weather.gov/seattle


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
TCMW1 - 9446482 - Tacoma Met, WA 12 mi44 min W 2.9 G 4.1
TCNW1 - 9446484 - Tacoma, WA 13 mi50 min 65°F 49°F1021.1 hPa
WPOW1 - West Point, WA 19 mi32 min N 8.9 G 8.9 58°F 1021.2 hPa (-0.6)49°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, WA2 mi39 minW 310.00 miMostly Cloudy66°F39°F37%1021.4 hPa
Renton Municipal Airport, WA6 mi39 minN 410.00 miA Few Clouds66°F41°F40%1020.8 hPa
Boeing Field - King County International Airport, WA8 mi39 minNNW 410.00 miPartly Cloudy66°F38°F36%1020.4 hPa
Tacoma, Tacoma Narrows Airport, WA19 mi39 minN 010.00 miMostly Cloudy65°F36°F34%1020.6 hPa
Tacoma / McChord Air Force Base, WA21 mi34 minWNW 310.00 miPartly Cloudy68°F34°F29%1021 hPa
Pierce County-Thun Field, WA22 mi37 minN 010.00 miMostly Cloudy63°F37°F39%1021 hPa

Link to 5 minute data for KSEA

Wind History from SEA (wind in knots)
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Last 24hrSW8S7S6S4CalmSW3S4S3CalmSE5S5S5S4W4CalmW7W6W5Calm4W6W4W5W3
1 day agoN5N4N5E5S3S3SE5SE4SE5SE3S4S4CalmCalmW53W4SW5W5W3CalmSW9W11W9
2 days agoN10N11NE12CalmCalmNE5E5N4NE4N4CalmCalmW3Calm3W5W5W4W7NW7N4N3N5NW6

Tide / Current Tables for Des Moines, Washington
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Des Moines
Click for Map
Mon -- 12:01 AM PDT     10.77 feet High Tide
Mon -- 02:46 AM PDT     Moonset
Mon -- 05:29 AM PDT     7.63 feet Low Tide
Mon -- 06:12 AM PDT     Sunrise
Mon -- 09:17 AM PDT     8.72 feet High Tide
Mon -- 11:02 AM PDT     Moonrise
Mon -- 05:05 PM PDT     0.67 feet Low Tide
Mon -- 08:05 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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10.810.59.998.17.77.788.48.78.686.95.53.92.41.20.712.2467.99.6

Tide / Current Tables for Restoration Point, 0.6 miles ESE of, Washington Current
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Restoration Point
Click for Map
Mon -- 02:48 AM PDT     Moonset
Mon -- 02:53 AM PDT     -0.40 knots Max Ebb
Mon -- 06:12 AM PDT     Sunrise
Mon -- 07:53 AM PDT     -0.06 knots Min Ebb
Mon -- 11:01 AM PDT     Moonrise
Mon -- 01:48 PM PDT     -0.67 knots Max Ebb
Mon -- 05:56 PM PDT     0.00 knots Slack
Mon -- 08:05 PM PDT     Sunset
Mon -- 08:35 PM PDT     0.50 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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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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