Wednesday, August12, 2020
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Marine Weather and Tides
Vashon, 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 6:01AMSunset 8:27PM Wednesday August 12, 2020 4:26 PM PDT (23:26 UTC) Moonrise 11:39PMMoonset 2:21PM Illumination 34% Phase: Waning Crescent; Moon at 24 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- 237 Pm Pdt Wed Aug 12 2020
Tonight..N wind 5 to 15 kt. Wind waves 2 ft or less.
Thu..SW wind to 10 kt becoming ne in the afternoon. Wind waves 1 ft or less.
Thu night..NE wind 5 to 15 kt. Wind waves 2 ft or less.
Fri..N wind to 10 kt. Wind waves 1 ft or less.
Fri night..NE wind to 10 kt. Wind waves 1 ft or less.
Sat..N wind to 10 kt. Wind waves 1 ft or less.
Sat night..N wind to 10 kt in the evening becoming light. Wind waves 1 ft or less.
Sun..Light wind becoming variable to 10 kt. Wind waves less than 1 ft becoming 1 ft or less.
Mon..Light wind becoming variable to 10 kt. Wind waves less than 1 ft becoming 1 ft or less.
PZZ100 237 Pm Pdt Wed Aug 12 2020
Synopsis for the northern and central washington coastal and inland waters..Onshore flow will persist through Friday. Low level flow turning offshore later Saturday then turning back onshore late Sunday. Strong afternoon and evening pushes are likely through the strait of juan de fuca through Friday.


7 Day Forecast for Marine Location Near Vashon, WA
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location: 47.4, -122.46     debug


Area Discussion for - Seattle, WA
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FXUS66 KSEW 122131 AFDSEW

Area Forecast Discussion National Weather Service Seattle WA 231 PM PDT Wed Aug 12 2020

SYNOPSIS. High pressure will build into the area for the end of the week into the weekend with much warmer temperatures and dry weather.

SHORT TERM /TONIGHT THROUGH SATURDAY/. Upper level trough is departing off to the east this afternoon, leaving scattered clouds and cooler temperatures than yesterday at this time. Cool down will be short-lived as high pressure begins to build over the area on Thursday and amplifies over the Desert Southwest into the weekend. This will yield mostly clear skies by Friday and a rapid warm-up in temperatures for the weekend. Highs on Thursday will be in the 70s but the lowlands will be back into the 80s by Saturday. A few spots south of Olympia may reach the 90 degree mark. Heat risk will reach moderate levels for those areas on Saturday so those who are sensitive to heat should begin to plan ahead for a warm weekend.

CEO

LONG TERM /SUNDAY THROUGH WEDNESDAY/. Next week is characterized by a large amount of uncertainty regarding the ridge and its subsequent break-down. Regardless, Sunday should be the peak of the heat with temperatures well into the 80s to low 90s across the lowlands. Areas south of Olympia and in the Cascade valleys may see the mid to upper 90s. This will yield a moderate to high heat risk. Overnight lows in the upper 50s to low 60s should provide a bit of relief though.

Past Sunday, uncertainty grows as deterministic models and their respective ensemble solutions are struggling with small-scale features. This is largely in part to how they handle the remnants of now Tropical Storm Elida as it rides north from it's current location west of the Baja Peninsula. Latest GFS runs surge some monsoonal moisture north along the western periphery of the ridge late Sunday into Tuesday for isolated showers (and maybe even a thunderstorm or two along the Cascades) with cooler temperatures. These solutions also swing an upper level trough through western WA by Wednesday with a few showers and further cooling. ECMWF and its ensembles are more bullish - holding onto the ridge for much of next week with mostly dry weather and slightly warmer temperatures than GFS/GEFS. For now, have stuck with a blended approach which leads to cooler temperatures than the weekend and periodic chances for showers, especially across the Cascades, into mid-week.

CEO

AVIATION. Clouds are continuing to clear out throughout the area. Some high level cirrus near KBLI and between KPAE and KOLM are prolonging the dissipation. The nightly marine push of moist air is expected to begin around 0800 UTC and with that clouds will be moving into the area for the night and into tomorrow morning. However, a ridge of high pressure is moving into the area so ceilings are expected to be higher then the past few nights have brought. VFR and MVFR conditions are expected at all airports tonight and into Thursday morning. The lowest overcast ceilings are should be around 1500 ft and only at airports near the coast. Airports inland should experience higher ceilings of 5000 ft and above. Thursday mornings clear out is expected to start around 1800UTC for areas inland and closer to 2000 UTC near the coast. Winds are to be less than 10 knots for all terminals in the area.

KSEA . Conditions will continue to improve during the rest of this afternoon and evening. Stratus will begin to move in around 0800 UTC tonight. At their lowest ceilings are should be around 5000 ft and occur around 1200 UTC. That being said, sky conditions are expected to remain in VFR.

Butwin

MARINE. The daily push down the Strait is expected to begin around 0000 UTC and will be at its peak in the East Entrance Zone around 0600 UTC. Wind speeds will be range from 15 to 20 knots with gusts close to 30 knots. As a result a small craft advisory has been issued for this time period. Winds will decrease come 1200 UTC and remain down until 0000 UTC Friday. Following that winds will begin to increase with the next push down the Strait. Because of the high pressure system also moving in wind speeds are expected to be closer to 30 knots. Wind gusts are likely to be at Gale force. Northerly to northwesterly flow will persist across the offshore waters through Saturday before flow becomes offshore briefly on Sunday. Onshore flow will resume late Sunday into Monday. Wind speeds will be less than 15 knots in these offshore waters during this entire period.

Northwesterly swell will continue to diminish tonight and into Thursday. Swells will be falling from 5 to 2 feet over the course of the next three days. Swells will increase again come Sunday with heights between 5 and 6 feet.

Butwin

FIRE WEATHER. Rapid-warm up expected this weekend with temperatures well into the 80s and 90s by Sunday. Dry and unstable conditions are expected to develop across the Cascades and lowland areas south of Olympia which could lead to critical fire weather conditions on Sunday. Minimum relative humidity values in those areas will drop into in the teens to 20s with mid-level Haines values of 6. Will continue to monitor for the possibility of any headlines needed over the next few days. There is some uncertainty regarding the weather pattern past Sunday but cooler conditions are likely for Monday and Tuesday.

CEO

HYDROLOGY. The daily hydrology discussion has ended until the start of the next rainy season; it will only be updated as needed until then.

SEW WATCHES/WARNINGS/ADVISORIES. WA . None. PZ . Small Craft Advisory from 6 PM this evening to 6 AM PDT Thursday for Central U.S. Waters Strait Of Juan De Fuca-East 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
TCMW1 - 9446482 - Tacoma Met, WA 9 mi56 min NW 7 G 8
TCNW1 - 9446484 - Tacoma, WA 10 mi56 min 68°F 56°F1019 hPa
46121 17 mi43 min 1.9 65°F 1018.4 hPa51°F
WPOW1 - West Point, WA 18 mi86 min SSW 6 G 7 61°F 1018.9 hPa (+0.0)53°F
46120 25 mi37 min Calm 62°F 1017.7 hPa52°F
46125 36 mi43 min 61°F 1017.9 hPa50°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 mi33 minWSW 710.00 miMostly Cloudy69°F44°F41%1019.2 hPa
Tacoma, Tacoma Narrows Airport, WA11 mi33 minVar 410.00 miMostly Cloudy67°F42°F41%1018.4 hPa
Boeing Field - King County International Airport, WA12 mi33 minVar 310.00 miOvercast69°F44°F41%1018.3 hPa
Renton Municipal Airport, WA14 mi33 minN 66.00 miFair70°F46°F44%1018.7 hPa
Tacoma / McChord Air Force Base, WA17 mi28 minNW 710.00 miPartly Cloudy69°F38°F33%1018.6 hPa
Bremerton, Bremerton National Airport, WA17 mi30 minNE 510.00 miMostly Cloudy67°F46°F49%1019 hPa
Fort Lewis / Gray U. S. Army Airfield, WA22 mi28 minESE 310.00 miMostly Cloudy71°F48°F45%1018.2 hPa
Pierce County-Thun Field, WA22 mi31 minW 410.00 miOvercast68°F41°F38%1018.6 hPa

Link to 5 minute data for KSEA

Wind History from SEA (wind in knots)
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Last 24hrW9SW7W10S8SW9SW8W5SW4SW5S5S6SE7SE8S7SE7S3SW4SW5S33S9Calm5W7
1 day ago6NW9N8N8NW6N5N6N6W3W5W6W5W6S6SW5S6SW7S9SW8SW106SW9W9SW8
2 days agoNW9N9N8N6N4W5NW3N5N4NW3CalmN3N4SE3W4NW3CalmNW55N8N11N10N11
G15
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Tide / Current Tables for Burton, Quartermaster Harbor (inside), Washington
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Burton
Click for Map
Wed -- 12:08 AM PDT     Moonrise
Wed -- 06:03 AM PDT     Sunrise
Wed -- 06:22 AM PDT     1.91 feet Low Tide
Wed -- 01:37 PM PDT     8.86 feet High Tide
Wed -- 03:21 PM PDT     Moonset
Wed -- 06:09 PM PDT     6.75 feet Low Tide
Wed -- 08:25 PM PDT     Sunset
Wed -- 11:42 PM PDT     10.28 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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10.29.27.75.94.12.722.12.94.25.77.28.28.88.88.57.87.16.86.97.68.59.410.1

Tide / Current Tables for Skagit Bay, 1 mile S of Goat Island, Washington Current
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Skagit Bay
Click for Map
Wed -- 12:07 AM PDT     -1.25 knots Max Ebb
Wed -- 12:09 AM PDT     Moonrise
Wed -- 03:14 AM PDT     0.03 knots Slack
Wed -- 06:03 AM PDT     Sunrise
Wed -- 06:08 AM PDT     1.41 knots Max Flood
Wed -- 10:11 AM PDT     -0.03 knots Slack
Wed -- 12:44 PM PDT     -1.02 knots Max Ebb
Wed -- 03:21 PM PDT     Moonset
Wed -- 03:32 PM PDT     0.02 knots Slack
Wed -- 06:19 PM PDT     1.12 knots Max Flood
Wed -- 08:25 PM PDT     Sunset
Wed -- 09:22 PM PDT     -0.03 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-1.3-1.2-0.9-0.40.71.21.41.31.10.80.2-0.7-1-1-0.8-0.50.40.81.11.10.80.3-0.6-0.9

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 (19,4,5,8)
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Ground Weather Radar Station Seattle/Tacoma, WA
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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.