Tuesday, March31, 2020
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Marine Weather and Tides
Seattle, WA

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 6:46AMSunset 7:40PM Tuesday March 31, 2020 7:35 PM PDT (02:35 UTC) Moonrise 9:53AMMoonset 1:18AM Illumination 55% 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- 312 Pm Pdt Tue Mar 31 2020
Tonight..W wind 10 to 20 kt becoming S to 10 kt after midnight. Wind waves 1 to 3 ft subsiding to 1 ft or less after midnight. A chance of showers and a slight chance of tstms.
Wed..Variable wind to 10 kt becoming N 15 to 25 kt in the afternoon. Wind waves 1 ft or less building to 2 to 4 ft in the afternoon. A chance of rain.
Wed night..N wind 15 to 25 kt becoming nw to 10 kt after midnight. Wind waves 2 to 4 ft subsiding to 1 ft or less after midnight.
Thu..Light wind becoming sw to 10 kt in the afternoon. Wind waves 1 ft or less.
Thu night..Variable wind to 10 kt in the evening becoming light. Wind waves 1 ft or less.
Fri..S wind to 10 kt becoming sw in the afternoon. Wind waves 1 ft or less.
Fri night..NW wind to 10 kt in the evening becoming light. Wind waves 1 ft or less.
Sat..Light wind. Wind waves less than 1 ft.
Sun..Light wind. Wind waves less than 1 ft.
PZZ100 312 Pm Pdt Tue Mar 31 2020
Synopsis for the northern and central washington coastal and inland waters..Onshore flow will continue across the waters today as a weak low moves down the coast. Strong offshore flow will develop north of the low early Wednesday. After this, expect weak high pressure with light surface gradients until the next organized system approaches the waters around the weekend.


7 Day Forecast for Marine Location Near Seattle, WA
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location: 47.68, -122.41     debug


Area Discussion for - Seattle, WA
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FXUS66 KSEW 312128 AFDSEW

Area Forecast Discussion National Weather Service Seattle WA 228 PM PDT Tue Mar 31 2020

SYNOPSIS. Lowland rain showers and mountain snow showers will continue off and on for the next several days along with below normal temperatures.

SHORT TERM /TONIGHT THROUGH FRIDAY/. Scattered rain and mountain snow showers continue to push east across the region this afternoon. There remains a chance of isolated thunderstorms this afternoon and early evening, with instability peaking in the next couple of hours. The main threats with any convective cells will be small hail and lightning. In the mountains, brief heavy snow would be possible with any stronger cells.

The threat of storms will decrease overnight, except along the coast where instability will remain as an upper level low drifts south just offshore. Wrap around moisture may combine with outflow through the Fraser River Valley to bring enhanced upslope flow along the northern Olympic Peninsula Wednesday morning. The low will continue to push south through the day Wednesday, dragging its forcing along with it and allowing conditions to dry out from north to south through the day.

Thursday will remain cool and somewhat drier, though isolated showers cannot be ruled out. Another wave rotating through a high amplitude trough centered over the Rockies looks to side swipe the region Friday. There is still some uncertainty with how far west the impacts from this system will be experienced. The odds are higher for areas along and east of the Cascade crest.

LONG TERM /SATURDAY THROUGH TUESDAY/. Anomalous troughing continues through the long term period and may continue for the next couple of weeks. This would result in continued below normal temperatures and occasional periods of wet/showery weather. -Wolcott-

AVIATION. Mostly VFR to higher MVFR ceilings across Western Washington this afternoon. Plenty of breaks in the clouds but showers are still scattered around the region, with localized lower ceilings. Little change into the afternoon, though still cannot rule out a few isolated thunderstorm into the evening. Predominantly VFR conditions into the evening with localized or brief lower conditions in the heavier showers. Air mass stabilizes a bit this evening with predominantly MVFR conditions with local IFR possible. Winds generally southerly or southwesterly across the area, but expect a shift to northeasterly winds across the northern parts of the area late tonight, impacting KBLI and KCLM, and northerly winds developing through the Puget Sound terminals into Wednesday afternoon.

KSEA . Generally broken VFR ceilings this afternoon, though a short reduction to MVFR possible if any heavier showers make it into the terminal area. Otherwise, the air mass stabilizes a bit into this evening and expect a trend toward MVFR after 10z. Generally southerly winds continue this evening and much of overnight, but expect a switch to northerly winds at the terminal around 18z Wednesday. Cullen

MARINE. Onshore flow continues across the waters today with relatively light surface gradients. A small craft advisory will remain in place for the coastal waters, with seas holding around 10 ft through tonight, before easing closer to 7 to 8 feet Wednesday.

A surface low with move south through the coastal waters tonight. This will bring increasing winds on the NE side of the low across the northern inland waters and down the Strait of Juan de Fuca very early Wednesday to high-end small craft advisory level winds. Cannot rule out a localized gale force gusts, but don't expect widespread gales to develop. These northerly winds also look to eventually make it into Admiralty Inlet, Puget Sound, and the portions of the northern Coastal Waters a little bit later in the day on Wednesday. Winds may then remain elevated into Thursday across the interior waters before finally relaxing through the remainder of the week. Seas may steepen a bit in response to stronger northerly winds behind the low on Wednesday, but at this point are expected to remain below advisory thresholds. Thereafter, seas look to remain benign through the remainder of the week. Cullen

HYDROLOGY. An unsettled pattern will continue through the week ahead, but the progressive nature of the pattern and precipitation amounts are not expected to lead to flooding concerns.

SEW WATCHES/WARNINGS/ADVISORIES. WA . Winter Weather Advisory until 5 AM PDT Wednesday for Cascades of Pierce and Lewis Counties-Cascades of Snohomish and King Counties-Olympics.

PZ . Small Craft Advisory until 5 AM PDT Wednesday for Coastal Waters From Cape Flattery To James Island 10 To 60 Nm-Coastal Waters From Cape Flattery To James Island Out 10 Nm-Coastal Waters From James Island To Point Grenville 10 To 60 Nm- Coastal Waters From James Island To Point Grenville Out 10 Nm-Coastal Waters From Point Grenville To Cape Shoalwater 10 To 60 Nm-Coastal Waters From Point Grenville To Cape Shoalwater Out 10 Nm-Grays Harbor Bar.

Small Craft Advisory from 5 AM to 3 PM PDT Wednesday for Northern Inland Waters Including The San Juan Islands.

Small Craft Advisory until 2 PM PDT this afternoon for West Entrance U.S. Waters Strait Of Juan De Fuca.

Small Craft Advisory from 2 AM to 2 PM PDT Wednesday for Central U.S. Waters Strait Of Juan De Fuca-West Entrance U.S. Waters Strait Of Juan De Fuca.



www.weather.gov/seattle


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WPOW1 - West Point, WA 2 mi36 min NNE 16 G 19 41°F 1017.3 hPa (+1.0)39°F
46120 6 mi28 min 40°F 1016.4 hPa36°F
46125 19 mi28 min 42°F 1016.5 hPa36°F
TCMW1 - 9446482 - Tacoma Met, WA 28 mi48 min S 6 G 8.9
TCNW1 - 9446484 - Tacoma, WA 29 mi48 min 46°F 48°F1017.9 hPa
46121 32 mi35 min 5.8 46°F 1017.6 hPa35°F
PTWW1 - 9444900 - Port Townsend, WA 35 mi48 min SE 7 G 8 44°F 47°F1017.4 hPa

Wind History for Seattle, Puget Sound, WA, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boeing Field - King County International Airport, WA12 mi43 minN 010.00 miMostly Cloudy44°F37°F76%1017.1 hPa
Renton Municipal Airport, WA16 mi43 minNW 89.00 miOvercast44°F35°F71%1017.6 hPa
Everett Snohomish County, WA17 mi43 minS 410.00 miLight Rain41°F36°F82%1017 hPa
Seattle, Seattle-Tacoma International Airport, WA17 mi43 minNW 610.00 miMostly Cloudy44°F37°F76%1017.7 hPa
Bremerton, Bremerton National Airport, WA24 mi40 minNE 510.00 miFair42°F37°F82%1017.5 hPa

Link to 5 minute data for KBFI

Wind History from BFI (wind in knots)
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2 days agoS8S10CalmS7S10S6S6S7S8S8S8S8S10S12
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Tide / Current Tables for Meadow Point, Shilshole Bay, Washington
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Meadow Point
Click for Map
Tue -- 02:18 AM PDT     Moonset
Tue -- 04:28 AM PDT     7.09 feet Low Tide
Tue -- 06:48 AM PDT     Sunrise
Tue -- 09:16 AM PDT     9.22 feet High Tide
Tue -- 10:52 AM PDT     Moonrise
Tue -- 04:48 PM PDT     0.56 feet Low Tide
Tue -- 07:39 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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9.69.18.47.67.27.27.68.38.99.29.18.36.95.33.51.90.90.61.22.64.36.27.99.2

Tide / Current Tables for Alki Point, 0.3 miles W of, Washington Current
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Alki Point
Click for Map
Tue -- 01:41 AM PDT     -0.27 knots Max Ebb
Tue -- 02:18 AM PDT     Moonset
Tue -- 05:46 AM PDT     0.00 knots Slack
Tue -- 06:44 AM PDT     0.05 knots Max Flood
Tue -- 06:49 AM PDT     Sunrise
Tue -- 08:18 AM PDT     -0.00 knots Slack
Tue -- 10:52 AM PDT     Moonrise
Tue -- 01:06 PM PDT     -0.50 knots Max Ebb
Tue -- 05:13 PM PDT     0.00 knots Slack
Tue -- 07:39 PM PDT     Sunset
Tue -- 08:13 PM PDT     0.49 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.2-0.2-0.3-0.2-0.1-0.1000-0.1-0.2-0.3-0.5-0.5-0.5-0.4-0.2-00.20.40.50.50.40.2

Weather Map
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wmap_P
GEOS Local Image of PacificNorthwest    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Seattle, WA (22,6,7,8)
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Ground Weather Radar Station Seattle/Tacoma, WA
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Disclaimer:
The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerous of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.