Friday, August14, 2020
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Marine Weather and Tides
Burien, 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 6:03AMSunset 8:24PM Friday August 14, 2020 9:28 AM PDT (16:28 UTC) Moonrise 12:14AMMoonset 4:29PM Illumination 18% Phase: Waning Crescent; Moon at 25 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- 857 Am Pdt Fri Aug 14 2020
Today..NE wind to 10 kt becoming N in the afternoon. Wind waves 2 ft or less.
Tonight..N wind 5 to 15 kt becoming ne after midnight. Wind waves 2 ft or less.
Sat..N wind 5 to 15 kt. Wind waves 2 ft or less.
Sat night..N wind 5 to 15 kt easing to 10 kt after midnight. Wind waves 2 ft or less.
Sun..Light wind becoming S to 10 kt in the afternoon. Wind waves 1 ft or less.
Sun night..SW wind 5 to 15 kt becoming S 10 to 20 kt after midnight. Wind waves 1 to 3 ft.
Mon..Light wind becoming nw to 10 kt. Wind waves 1 ft or less.
Tue..Light wind becoming variable to 10 kt. Wind waves 1 ft or less.
PZZ100 857 Am Pdt Fri Aug 14 2020
Synopsis for the northern and central washington coastal and inland waters..High pressure over the northeastern pacific and lower pressure inland will maintain onshore flow through the strait of juan de fuca and northerly winds over the coastal waters today. Thermal low pressure builds up oregon coast tonight, before expanding over western washington Saturday for brief offshore flow. Expect a southerly wind reversal over the coastal waters late Sunday.


7 Day Forecast for Marine Location Near Burien, WA
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location: 47.48, -122.4     debug


Area Discussion for - Seattle, WA
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FXUS66 KSEW 141228 CCA AFDSEW

Area Forecast Discussion . CORRECTED National Weather Service Seattle WA 528 AM PDT Fri Aug 14 2020

SYNOPSIS. A warm upper ridge will nose into the area with much warmer weather on tap for the weekend. Temperatures will peak across the inland portion of Western Washington Sunday before easing Monday and Tuesday as the ridge weakens.

SHORT TERM /TODAY THROUGH SUNDAY/. Onshore flow continues across western WA today with another mild/seasonable weather day on tap. There's little to no cloud cover so expect a sunny day. Temperatures will be close to average.

High pressure and offshore flow will bring rising temperatures this weekend. Saturday will see temperatures rising into the 80s with low 90s possible (mainly Olympia-Tacoma on south). N/NW flow will keep temps along the beaches in the 60s but you'll see 80s a few miles inland. Temperatures will peak on Sunday with widespread 90s expected across the region. May even see triple digits in the Cascade valleys. There's potential for moderate to high heat risk and therefore an Excessive Heat Watch is in effect. 33

LONG TERM /MONDAY THROUGH THURSDAY/. High pressure will shift east and inland on Monday and Tuesday for a little relief from the heat. The coast especially will feel the relief as onshore flow and marine clouds keeps temps in the 60s. The interior will still see relatively warm conditions highs in the 80s. However, the heat risk will be lower overall.

A stronger marine push Tuesday night and Wednesday will bring cooler marine air inland for a return toward normal. A weak passing trough may along bring a few showers to the area. Similar conditions are expected for Thursday. 33

FIRE WEATHER. A Fire Weather Watch is in effect for the Cascades and Black Hills/Southwest Interior lowlands Saturday morning through Sunday evening.

Hot, dry and unstable conditions are forecast this weekend with temperatures reaching the 90s (near 100 in the Cascade valleys) and min humidities in the teens to 20s. Mid-level Haines will also reach a 6 or high potential for large fire growth. 33

AVIATION. Light northwest flow aloft and a generally dry and stable air mass will maintain VFR conditions continue this morning under clear skies. One exception will be offshore and along the immediate coastline, where some shallow marine stratus will return. This could perhaps push as far as the coastal terminals by daybreak. Onshore winds through the Strait and coast, with northerly winds through the Puget Sound terminals today, with speeds increasing to around 10 kt during the late afternoon.

KSEA . VFR conditions continue through the period. Northerly surface winds today to around 10 kt, easing after 05z tonight. Cullen

MARINE. Winds have eased below advisory thresholds this morning in the Strait of Juan de Fuca, so that Small Craft Advisory has been cancelled. Thermal low pressure will continue to strengthen to our south up the Oregon coast today, strengthening the surface pressure gradient over the southern coastal waters zones. The strongest winds are expected south of Point Grenville and within 10- 20 nm from shore. As a result, the advisory was not extended into the outer coastal zones, but brief or localized advisory strength winds cannot be entirely ruled out in these areas during the late afternoon/evening. Breezy northerly continue over the waters Saturday and offshore flow through the Strait of Juan de Fuca with building short-period seas resulting in choppy conditions. A southerly wind reversal will develop over the coastal waters Sunday with a return to onshore flow early next week. Cullen

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 . Excessive Heat Watch from Sunday morning through Sunday evening for Bellevue and Vicinity-Bremerton and Vicinity-Cascades of Pierce and Lewis Counties-Cascades of Snohomish and King Counties-Cascades of Whatcom and Skagit Counties-East Puget Sound Lowlands-Everett and Vicinity-Hood Canal Area-Lower Chehalis Valley Area-Seattle and Vicinity-Southwest Interior-Tacoma Area.

Fire Weather Watch from Saturday morning through Sunday evening for Black Hills and Southwest Interior Lowlands-West Slopes of the Central Cascades Generally above 1500 Feet-West Slopes of the North Cascades Generally above 1500 Feet.

PZ . Small Craft Advisory from 1 PM this afternoon to 11 PM PDT this evening for Coastal Waters From James Island To Point Grenville Out 10 Nm-Coastal Waters From Point Grenville To Cape Shoalwater Out 10 Nm.



www.weather.gov/seattle


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WPOW1 - West Point, WA 13 mi89 min N 2.9 G 2.9 56°F 1023.8 hPa (+0.7)51°F
46120 19 mi37 min Calm 58°F 1022.9 hPa51°F
46121 22 mi35 min 1.9 59°F 1023.9 hPa51°F
46125 32 mi35 min 57°F 1023.2 hPa52°F

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, WA6 mi36 minVar 410.00 miFair64°F48°F56%1023.5 hPa
Seattle, Seattle-Tacoma International Airport, WA6 mi36 minNE 810.00 miFair64°F48°F56%1024 hPa
Renton Municipal Airport, WA10 mi36 minN 05.00 miFair63°F50°F63%1023.9 hPa
Tacoma, Tacoma Narrows Airport, WA17 mi36 minVar 310.00 miFair58°F48°F70%1023.8 hPa
Bremerton, Bremerton National Airport, WA20 mi33 minENE 410.00 miFair61°F48°F65%1024.1 hPa
Tacoma / McChord Air Force Base, WA23 mi31 minN 310.00 miFair60°F48°F64%1024 hPa

Link to 5 minute data for KSEA

Wind History from SEA (wind in knots)
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Last 24hr5CalmW4W6W7NW6W5W9NW7W6W5N6N8N12NE10N8N7NE11NE7N6E4NE7NE4NE8
1 day agoSW5S33S9Calm5W7W7NW53NW3N5NE6CalmCalmN6NE9E5E6E6E4SE7S6S5
2 days agoS9SW8SW106SW9W9SW8W9SW7W10S8SW9SW8W5SW4SW5S5S6SE7SE8S7SE7S3SW4

Tide / Current Tables for Port Vashon, Washington
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Port Vashon
Click for Map
Fri -- 12:28 AM PDT     9.73 feet High Tide
Fri -- 01:13 AM PDT     Moonrise
Fri -- 06:05 AM PDT     Sunrise
Fri -- 08:09 AM PDT     0.47 feet Low Tide
Fri -- 04:04 PM PDT     9.98 feet High Tide
Fri -- 05:30 PM PDT     Moonset
Fri -- 08:22 PM PDT     Sunset
Fri -- 08:42 PM PDT     7.60 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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9.79.697.86.24.32.51.10.50.81.93.55.57.48.89.7109.79.18.37.77.688.6

Tide / Current Tables for Skagit Bay, 1 mile N of Rocky Point, Washington Current
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Skagit Bay
Click for Map
Fri -- 01:13 AM PDT     Moonrise
Fri -- 06:05 AM PDT     Sunrise
Fri -- 06:51 AM PDT     -1.08 knots Max Ebb
Fri -- 09:10 AM PDT     0.00 knots Slack
Fri -- 01:11 PM PDT     0.68 knots Max Flood
Fri -- 03:40 PM PDT     -0.00 knots Slack
Fri -- 05:30 PM PDT     Moonset
Fri -- 08:22 PM PDT     Sunset
Fri -- 08:24 PM PDT     -0.50 knots Max Ebb
Fri -- 10:20 PM PDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0-0.2-0.4-0.6-0.8-0.9-1-1.1-0.8-0.10.20.50.60.70.60.3-0.1-0.2-0.4-0.4-0.5-0.4-0.10

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 (12,3,4,5)
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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.