Friday, February28, 2020
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Marine Weather and Tides
Bryn Mawr-Skyway, 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 6:49AMSunset 5:53PM Friday February 28, 2020 12:28 PM PST (20:28 UTC) Moonrise 9:15AMMoonset 11:08PM Illumination 27% Phase: Waxing Crescent; Moon at 5 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- 202 Am Pst Fri Feb 28 2020
.small craft advisory in effect from 10 am pst this morning through late tonight...
Today..S wind to 10 kt rising to 15 to 25 kt in the afternoon. Wind waves 1 ft or less building to 2 to 4 ft in the afternoon. Patchy fog in the morning. A chance of rain in the afternoon.
Tonight..SW wind 15 to 25 kt. Wind waves 2 to 4 ft. Rain.
Sat..SW wind 5 to 15 kt. Wind waves 2 ft or less. Rain likely.
Sat night..Variable wind 5 to 15 kt easing to 10 kt after midnight. Wind waves 2 ft or less.
Sun..Variable wind to 10 kt in the morning becoming light. Wind waves 1 ft or less in the morning becoming less than 1 ft.
Sun night..Variable wind 5 to 15 kt becoming S after midnight. Wind waves 2 ft or less.
Mon..S wind to 10 kt becoming sw 5 to 15 kt. Wind waves 2 ft or less.
Tue..SW wind 5 to 15 kt. Wind waves 2 ft or less.
PZZ100 202 Am Pst Fri Feb 28 2020
Synopsis for the northern and central washington coastal and inland waters..A cold front will move through the area this afternoon and evening. Strong onshore flow tonight will ease Saturday. Additional fronts will arrive Monday and Tuesday.


7 Day Forecast for Marine Location Near Bryn Mawr-Skyway, WA
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location: 47.52, -122.26     debug


Area Discussion for - Seattle, WA
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FXUS66 KSEW 281705 AFDSEW

Area Forecast Discussion National Weather Service Seattle WA 905 AM PST Fri Feb 28 2020

UPDATE. Only notable change to the forecast this morning was to issue a Dense Fog Advisory for the SW Interior and across southern portions of Puget Sound. Recent observations indicate visibility of 1/4 to 1/8 miles across these areas. Visibility is expected to gradually improve over the next few hours. Continue to use caution while traveling this morning.

Aside from dense lowland fog around the Sound, higher level cloud cover will continue to increase throughout the day. Water vapor loop currently depicts the next shortwave trough near 130W. Associated organized frontal boundary located in its vicinity in the lower levels. Showers exist along and ahead of the frontal boundary and are enroute to the region (currently depicted offshore per MRMS imagery). Showers will begin to push onshore this afternoon and gradually make it towards Puget Sound by late afternoon/early evening hours, and finally to the mountains later in the evening. Current forecast shows this well along with associated impacts of breezy winds and higher terrain snowfall.

Previous discussion can be referenced below along with an updated marine and aviation section.

Kovacik

PREV DISCUSSION. /issued 217 AM PST Fri Feb 28 2020/

SYNOPSIS. Active weather takes hold later today into next week with a series of systems that will move across the area. Lowland rain, mountain snow, and breezy winds will accompany each system.

SHORT TERM /TODAY THROUGH SUNDAY/. Tranquil morning with patchy fog developing around the Sound. Dry weather through the morning hours before frontal system approaches the coast this afternoon. Rain will move onshore later this afternoon and evening and march east across the area along with a cold front that moves through Saturday morning. Showers will likely persist through the day Saturday behind the cold front as upper level trough remains overhead. Modest instability will be present across the coastal waters and along the coast so have included a slight chance of thunder. Breezy southerly winds will accompany the system with gusts on the order of 15-30 mph, strongest near the coast and northern inland waters.

Main impact from this system is expected to be mountain snow. Snow levels will lower down to 1200-2000 feet behind the cold front with decent accumulations. Still looking like 6 to 12 inches at pass levels through Saturday afternoon. Have issued a winter weather advisory to cover likely impacts to weekend travelers. Those with travel plans should monitor the forecast and check WSDOT road conditions before departing. Behind the front, westerly push down the Strait may also lead to the development of a convergence zone across Snohomish/King counties. This could locally enhance snowfall rates and amounts in affected areas.

Upper level trough departs on Sunday with a brief period of ridging across Western Washington. Outside of a few lingering showers across the Cascades in the morning, most of the area should see dry weather with the potential for a sunbreak or two.

CEO

LONG TERM /MONDAY THROUGH THURSDAY/. Unsettled weather looks to continue for the majority of next week as a series of systems moves across the area. Next one arrives sometime Monday into Tuesday with lowland rain and another round of mountain snow impacting travel. Snow levels look slightly higher which may limit impacts slightly at Snoqualmie Pass. Models and ensemble guidance have also backed off slightly on gradients with this system so doesn't look quite as windy as previously indicated. Still plenty of time for things to change so confidence low in details at this point. Wet weather will continue past Tuesday Winter isn't giving up just yet.

CEO

AVIATION. A broad upper ridge over the Pacific Northwest will shift inland today with a short wave upper trough and an associated cold front crossing Western Washington this evening. The flow aloft will be west to southwest today and tonight. At the surface, southerly flow will increase ahead of the front today and then become southwest to west behind the front tonight. Stable air today will become unstable near the coast tonight.

Fairly widespread low clouds and fog should lift and break up this morning and give way to some high clouds. Low and mid clouds will develop this afternoon and evening as the front moves through. Low clouds will linger behind the front tonight in onshore flow.

A Puget Sound Convergence Zone will likely form near the King/Snohomish county line tonight behind the front.

KSEA . Fog and low clouds should break up late this morning with high clouds for most of the afternoon. Ceilings will lower later this afternoon as a front nears. Low clouds are expected tonight with and behind the front. Light wind this morning will become southerly 5-10 knots this afternoon and then increase to 10-20 knots with higher gusts this evening. Schneider

MARINE. A cold front will move through the area this afternoon and evening. High end small craft advisory strength winds are expected all waters. Low end southerly gales are not out of the question right along the front for the Coastal Waters, entrances to the Strait, and Northern Inland Waters this afternoon and evening. There could also be gale force west winds down the Strait behind the front tonight. While possible, the gales looks marginal and the forecast for these areas is just under gale for now (20-30 knots).

Gradually easing onshore flow will prevail behind the front Saturday and Sunday. Additional fronts will move through the area Monday and Tuesday. Schneider

HYDROLOGY. Wet weather expected for later today into next week. At this time, each system looks fairly progressive so no river flooding is expected.

SEW WATCHES/WARNINGS/ADVISORIES. WA . Dense Fog Advisory until 11 AM PST this morning for Bremerton and Vicinity-Seattle and Vicinity-Southwest Interior-Tacoma Area.

Winter Weather Advisory from 7 PM this evening to 4 PM PST Saturday for Cascades of Pierce and Lewis Counties-Cascades of Snohomish and King Counties-Cascades of Whatcom and Skagit Counties.

PZ . Small Craft Advisory until 5 PM PST Saturday for Grays Harbor Bar.

Small Craft Advisory until 4 PM PST Saturday 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.

Small Craft Advisory from noon today to 10 AM PST Saturday for East Entrance U.S. Waters Strait Of Juan De Fuca-Northern Inland Waters Including The San Juan Islands.

Small Craft Advisory until 4 AM PST Saturday for Admiralty Inlet- Puget Sound and Hood Canal-West Entrance U.S. Waters Strait Of Juan De Fuca.

Small Craft Advisory from 6 PM this evening to 10 AM PST Saturday for Central 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 14 mi89 min S 18 G 19 42°F 1017 hPa (-2.6)42°F
46120 18 mi35 min S 5.8 45°F 1015.1 hPa41°F
TCMW1 - 9446482 - Tacoma Met, WA 19 mi59 min WSW 4.1 G 6
TCNW1 - 9446484 - Tacoma, WA 19 mi59 min 42°F 48°F1018.2 hPa
PTWW1 - 9444900 - Port Townsend, WA 49 mi59 min E 13 G 16 44°F 47°F1016 hPa

Wind History for Seattle, Puget Sound, WA, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure

Link to 5 minute data for KBFI

Wind History from BFI (wind in knots)
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Last 24hrSE6SE54SE63S7S6CalmSW4SW3CalmNW3NW43CalmNW3CalmCalmCalmCalmCalmSE8CalmCalm
1 day agoCalmCalmCalmCalmCalmSE535S5CalmS4SE33SE6E5SE3SE3S3SE4CalmE3E3SE5SE5
2 days ago------SE5CalmCalmCalmS3CalmSW43CalmSE3CalmCalmCalmCalmCalmCalmW4SE5S3SE4Calm

Tide / Current Tables for Duwamish Waterway, Washington
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Duwamish Waterway
Click for Map
Fri -- 01:33 AM PST     3.10 feet Low Tide
Fri -- 06:52 AM PST     Sunrise
Fri -- 07:39 AM PST     10.72 feet High Tide
Fri -- 09:14 AM PST     Moonrise
Fri -- 02:21 PM PST     2.53 feet Low Tide
Fri -- 05:52 PM PST     Sunset
Fri -- 08:21 PM PST     8.93 feet High Tide
Fri -- 11:08 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.23.23.24.25.87.79.410.510.7108.66.853.42.62.73.85.36.98.28.98.88.17

Tide / Current Tables for Restoration Point, 0.6 miles ESE of, Washington Current
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Restoration Point
Click for Map
Fri -- 02:24 AM PST     0.00 knots Slack
Fri -- 04:28 AM PST     0.44 knots Max Flood
Fri -- 06:52 AM PST     Sunrise
Fri -- 07:43 AM PST     -0.00 knots Slack
Fri -- 09:14 AM PST     Moonrise
Fri -- 11:23 AM PST     -0.77 knots Max Ebb
Fri -- 03:22 PM PST     0.00 knots Slack
Fri -- 05:09 PM PST     0.35 knots Max Flood
Fri -- 05:52 PM PST     Sunset
Fri -- 08:19 PM PST     -0.00 knots Slack
Fri -- 11:08 PM PST     Moonset
Fri -- 11:36 PM PST     -0.54 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.6-0.4-0.10.20.40.40.30.2-0.1-0.4-0.6-0.8-0.7-0.6-0.4-0.10.20.30.30.20.1-0.2-0.4-0.5

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 (15,3,4,5)
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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.