Monday, May29, 2017 L-36.com


Marine Weather and Tides
Burien, WA

Version 3.4
What's New / NOTES
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 5:15AMSunset 8:58PM Monday May 29, 2017 12:50 AM PDT (07:50 UTC) Moonrise 8:38AMMoonset 11:44PM Illumination 15% Phase: Waxing Crescent; Moon at 4 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- 904 Pm Pdt Sun May 28 2017
Tonight..N wind 5 to 15 kt becoming s. Wind waves 2 ft or less.
Mon..Variable wind 10 kt or less. Wind waves 1 ft or less. Patchy fog in the morning.
Mon night..Variable wind 5 to 15 kt. Wind waves 2 ft or less. A slight chance of showers.
Tue..Light wind...becoming sw 10 to 20 kt. Wind waves 3 ft or less.
Tue night..SW wind 10 to 20 kt easing late. Wind waves 3 ft or less.
Wed..S wind 10 kt or less. Wind waves 1 ft or less.
Wed night..Variable wind 10 kt or less. Wind waves 1 ft or less.
Thu..S wind 5 to 15 kt. Wind waves 2 ft or less.
Fri..Variable wind 10 kt or less. Wind waves 1 ft or less.
PZZ100 904 Pm Pdt Sun May 28 2017
Synopsis for the northern and central washington coastal and inland waters..High pres offshore along with lowering pres E of the cascades will result in strengthening onshore flow through Mon. This will result in gale force winds over parts of the strait of juan de fuca. The flow will weaken on Tue.

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 290433
afdsew
area forecast discussion
national weather service seattle wa
933 pm pdt Sun may 28 2017

Synopsis An upper ridge over eastern washington will continue
to shift slowly eastward through memorial day. Onshore flow will
increase tonight through Tuesday as the upper ridge shifts east.

Marine moisture, in the form of low clouds will push further
inland and persist longer each day. An upper trough and southerly
flow aloft will bring an increasing chance of showers and a few
thunderstorms, mainly Tuesday and Tuesday night. Weak weather
disturbances will keep clouds and a chance of showers in the
forecast through the end of next week.

Short term Onshore flow is increasing this evening. Pressure
gradients through the strait of juan de fuca are now up to 2.5 mb
and increasing, while the pressure gradient from hoquiam to
seattle is now 3.5 mb. The marine push appears to be on now with
stratus streaming inland through the chehalis gap and some fog
moving in through the strait of juan de fuca. With the southerly
flow aloft, expect the push to initially be shallow and clouds to
burn off in the interior by midday on memorial day. Still,
temperatures will be 7-9 degrees cooler in the interior on
memorial day than they were today. With southerly flow aloft and
warm air persisting in the cascades, expect a slight chance of
showers or thunderstorms during the late afternoon and evening
hours on Monday.

The strength of the onshore flow is expected to increase Monday
night, allowing marine air to penetrate all the way to the cascade
crest by early Tuesday. At the same time, expect mid and upper
level moisture to increase and southerly flow aloft to become
somewhat diffluent on Tuesday as an upper level trough moves
northeast through the coastal and offshore waters. This will
result in the formation of some showers and possible
thunderstorms, particularly Tuesday afternoon and evening. With
the deeper moisture in place and the shower activity, temperatures
on Tuesday will be quite a bit cooler, in the upper 50s to mid
60s.

An evening update was issued to blend the forecast of cloud cover,
pops, and precipitation amount with the model consensus. Albrecht

Long term From the previous long term discussion: the rest of
the week will probably see western wa in a regime of deep marine
layer clouds that break out in the afternoon and evening. There is
a chance or slight chance of showers each day but the forecast is
fairly meaningless and the differences in timing of weak
shortwaves makes it impossible to say which days have the best
chance of being decent and which will be gloomier. One way it
often turns out is with some areas of morning drizzle and then
late afternoon sunbreaks. The pscz area is obviously a likely
place to see drippy weather this time of year with weak shortwaves
and middling heights. In the gfs, upper level heights do recover
a bit around the end of the week, so perhaps Friday and Saturday
will be decent days before an upper trough moves into the
northeast pacific early the following week. And then there is the
ecmwf which is cool and showery as an upper low moves over the
area by next Saturday. A period of sunny weather with above normal
temps like we have seen this weekend is not at all likely for
some time based on the global models I see today.

Aviation Wrn wa will remain btwn an upper level trof offshore
and a ridge over the interior west for SW flow aloft. Expect the
surface onshore pres gradient to continue strengthening overnight,
leading to fairly wdsprd MVFR CIGS across the lower elevations
mon morning. There will also be areas of ifr CIGS vsbys over the
interior lowlands after 0900 utc.

Ksea... Expect MVFR CIGS to arrive between 2 am and 5 am, possibly
dipping into the ifr category for a couple of hours Monday
morning. Winds will back to sly 5-10 knots overnight.

Marine High pressure offshore coupled with lowering pressure
east of the cascades will result in strengthening onshore flow
through Monday. The flow will weaken Tue as the offshore high
shifts east, eventually moving onto the wa coast Tue evening. A
1014 mb high on the wa coast with lower pressure east of the
cascades will result in light onshore flow on Wednesday.

Sew watches warnings advisories
Wa... None.

Pz... Gale warning in effect until 6 am pdt Monday for the central
and eastern strait of juan de fuca.

Small craft advisory in effect until 6 am pdt Monday for the
admiralty inlet, northern inland waters, and west entrance
to the strait of juan de fuca.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
EBSW1 - 9447130 - Seattle, WA 9 mi50 min WNW 7 G 7 56°F 51°F1016.9 hPa (+0.9)
WPOW1 - West Point, WA 13 mi50 min NE 5.1 G 6 56°F 1016.9 hPa (+0.8)51°F
TCMW1 - 9446482 - Tacoma Met, WA 14 mi50 min W 5.1 G 6
TCNW1 - 9446484 - Tacoma, WA 15 mi50 min 59°F 49°F1018 hPa (+1.9)
46120 19 mi38 min NNW 5.8 54°F 1016.3 hPa51°F
46121 22 mi1419 min 5.8 54°F 1017.3 hPa50°F
PTWW1 - 9444900 - Port Townsend, WA 48 mi50 min SSW 5.1 G 7 53°F 51°F1017.8 hPa (+0.4)

Wind History for Seattle, Puget Sound, WA, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Seattle, Seattle Boeing Field, WA6 mi57 minVar 310.00 miFair63°F52°F68%1016.7 hPa
Seattle, Seattle-Tacoma International Airport, WA6 mi57 minW 710.00 miFair61°F48°F63%1017.8 hPa
Renton, Renton Municipal Airport, WA10 mi57 minN 010.00 miFair65°F51°F61%1017.1 hPa
Tacoma, Tacoma Narrows Airport, WA17 mi57 minWSW 510.00 miFair54°F51°F90%1017.9 hPa
Bremerton, Bremerton National Airport, WA20 mi54 minSSW 510.00 miFair52°F50°F93%1019 hPa
Tacoma / McChord Air Force Base, WA23 mi52 minW 410.00 miFair56°F53°F93%1018.2 hPa

Wind History from BFI (wind in knots)
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Last 24hrCalmCalmCalmN3CalmCalmCalmCalmNW3544NW5NW7NW8NW8NW10NW55NW6NW8NW4N33
1 day agoCalmCalmCalmCalmCalmCalmCalmCalmCalmNW4N5NW655NW7NW75NW7NW6NW6NW4NW4CalmCalm
2 days agoCalmCalmCalmCalmCalmCalmCalmCalmCalm34NW7NW7NW7NW7665NW6NW5NW4W3N3Calm

Tide / Current Tables for Point Vashon, Vashon Island, Puget Sound, Washington
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Point Vashon
Click for Map
Mon -- 02:34 AM PDT     6.25 feet Low Tide
Mon -- 05:18 AM PDT     Sunrise
Mon -- 07:29 AM PDT     10.53 feet High Tide
Mon -- 09:38 AM PDT     Moonrise
Mon -- 02:22 PM PDT     -2.52 feet Low Tide
Mon -- 08:56 PM PDT     Sunset
Mon -- 09:48 PM PDT     12.52 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
9.17.46.46.37.18.39.610.410.49.37.34.51.6-1-2.4-2.2-0.42.35.58.510.912.212.511.9

Tide / Current Tables for Skagit Bay, 1 mile N of Rocky Point, Washington Current
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Skagit Bay
Click for Map
Mon -- 02:00 AM PDT     -1.02 knots Max Ebb
Mon -- 03:50 AM PDT     0.00 knots Slack
Mon -- 05:18 AM PDT     Sunrise
Mon -- 06:36 AM PDT     0.34 knots Max Flood
Mon -- 07:27 AM PDT     -0.00 knots Slack
Mon -- 09:38 AM PDT     Moonrise
Mon -- 01:29 PM PDT     -1.45 knots Max Ebb
Mon -- 03:19 PM PDT     0.01 knots Slack
Mon -- 07:31 PM PDT     1.26 knots Max Flood
Mon -- 08:57 PM PDT     Sunset
Mon -- 10:02 PM PDT     -0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.8-1-1-0.600.20.30.3-0.2-0.5-0.8-1.1-1.3-1.4-1.3-0.40.30.81.11.21.20.70-0.3

Weather Map and Satellite Images
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Weather Map
wmap_P
IR Satellite Image from GEOS
west_satellite

GOES Local Image of PacificNorthwest    EDIT
Geos

Wind Forecast for Seattle, WA (3,6,7,8)
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Ground Weather Radar Station Seattle/Tacoma, WA
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weather_mapweather_map weather_map

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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 numerious 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.