Thursday, September21, 2017 L-36.com


Marine Weather and Tides
Mercer Island, WA

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
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 6:54AMSunset 7:08PM Thursday September 21, 2017 1:39 AM PDT (08:39 UTC) Moonrise 7:24AMMoonset 7:13PM Illumination 0% Phase: New Moon; Moon at 1 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- 900 Pm Pdt Wed Sep 20 2017
Tonight..S wind 5 to 15 kt. Wind waves 2 ft or less. Chance of showers.
Thu..SW wind to 10 kt becoming N in the afternoon. Wind waves 1 ft or less. A slight chance of showers.
Thu night..N wind to 10 kt in the evening becoming light. Wind waves 1 ft or less. A slight chance of showers in the evening.
Fri..Light wind becoming N to 10 kt in the afternoon. Wind waves 1 ft or less.
Fri night..N wind to 10 kt in the evening becoming light. Wind waves 1 ft or less.
Sat..Light wind. Wind waves less than 1 ft.
Sat night..NW wind to 10 kt in the evening becoming light. Wind waves 1 ft or less.
Sun..Light wind. Wind waves less than 1 ft.
Mon..N wind to 10 kt. Wind waves 1 ft or less.
PZZ100 900 Pm Pdt Wed Sep 20 2017
Synopsis for the northern and central washington coastal and inland waters..Weak low pressure will remain over the area through Thursday. High pressure will build over the area Friday and Saturday.

7 Day Forecast for Marine Location Near Mercer Island, WA
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location: 47.54, -122.26     debug


Area Discussion for - Seattle, WA
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Fxus66 ksew 210411
afdsew
area forecast discussion
national weather service seattle wa
900 pm pdt Wed sep 20 2017

Synopsis An upper level low will maintain a chance of showers and
cooler temperatures over western washington Thursday. Drier north
flow aloft from an offshore upper level ridge will bring sunshine
and a little warming Friday and Saturday. The weakening ridge will
move over the area Sunday and Monday but could allow transient weak
weather systems to bring some spotty light rain.

Short term An upper level low oriented northeast to southwest
over the pacific northwest will slowly move southeast tonight and
Thursday. Flow aloft will become northeast Thursday and more
northerly Friday. The air mass will remain weakly unstable, giving
mostly cloudy skies and a chance of showers into Thursday evening.

The flow aloft will still be drier than the air mass the past couple
of days so there will probably be some breaks in the clouds at
times on Thursday.

The northerly flow will dry on Friday with areas of morning clouds
giving way to a mostly sunny afternoon. The clearing will also allow
radiational cooling Friday night so that patchy fog will be around
Saturday morning. The upper level ridge will move inland Saturday.

There will be quite a bit of flow through the ridge, perhaps enough
that mid and high level moisture from a weak warm front moving
inland over british columbia could brush the area with some clouds
in the afternoon. The air mass will still be a little cooler than
normal. Kam burke

Long term Previous discussion... The upper level ridge will remain
over the area with a positive tilt Sunday and Monday night. This has
the ridge axis extending NE from the wa offshore waters across
central b.C. There will still be quite a bit of flow through the
ridge with mainly mid and high level clouds crossing W wa. Both the
gfs and ECMWF have one or two systems embedded in the flow aloft
brushing mainly the N part of W wa with some light rain.

Unfortunately, the models don't really agree on which systems could
bring the area some light rain, so the Sunday-Monday night forecast
is more of a broad brush with slight chance pops.

Both models briefly build the ridge around mid-week with 500 mb
heights rising to around 5820 meters. This should allow temperatures
to warm back to near normal. Unfortunately, once again the models
don't quite agree on whether this will be Tuesday or Wednesday, so
confidence is not very high. Kam

Aviation Thu upper level trough over the pacific
northwest will dig southward into northern california overnight.

Light northerly flow aloft will become northeasterly as the trough
shifts southward. Weak low level onshore flow tonight with some
partial clearing this evening. Clouds will fill back in with MVFR
ceilings by around 10-12z over most of the interior and coast and
linger into the afternoon before lifting and scattering out toVFR
levels.

Ksea... South to southeasterly winds 4 to 6 kt with MVFR ceilings
developing around 10 to 11z.

Marine Light onshore flow with small craft northwesterlies over
the outer coastal waters this evening. Weak low pressure over the
area Thursday will be replaced with weak high pressure for the end
of the week as an upper ridge replaces the upper trough over the
region.

Sew watches warnings advisories
Wa... None.

Pz... Small craft advisory outer coastal waters this evening.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
EBSW1 - 9447130 - Seattle, WA 6 mi51 min SSE 4.1 G 6 53°F 55°F1010.9 hPa
WPOW1 - West Point, WA 13 mi39 min SSW 8 G 8 53°F 1010.9 hPa (+1.1)49°F
46120 17 mi47 min SW 5.8 54°F 1010 hPa49°F
TCMW1 - 9446482 - Tacoma Met, WA 20 mi51 min ESE 4.1 G 5.1
TCNW1 - 9446484 - Tacoma, WA 21 mi57 min 52°F 55°F1011.1 hPa
46121 31 mi45 min 3.9 52°F 1010.2 hPa49°F
PTWW1 - 9444900 - Port Townsend, WA 48 mi57 min SE 4.1 G 4.1 50°F 51°F1010.8 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, WA2 mi46 minSSE 410.00 miFair51°F48°F92%1010.9 hPa
Renton Municipal Airport, WA3 mi46 minSE 410.00 miFair51°F48°F92%1011.3 hPa
Seattle, Seattle-Tacoma International Airport, WA7 mi46 minSE 510.00 miMostly Cloudy51°F48°F89%1011.4 hPa

Wind History from BFI (wind in knots)
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Last 24hr3CalmCalmCalmCalmCalm3433NW3CalmCalmSE6W6SW3S4SW4S5E4SE4SE4SE5SE4
1 day agoSE9SE6SE7SE8S8S11S6S7S7SW106S8S8SW5W3Calm4NW4CalmE3SE6E3E4Calm
2 days agoW4SW43S4S4SE7S6S9S10
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Tide / Current Tables for Duwamish Waterway, Washington
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Duwamish Waterway
Click for Map
Thu -- 12:24 AM PDT     2.01 feet Low Tide
Thu -- 06:17 AM PDT     10.27 feet High Tide
Thu -- 06:55 AM PDT     Sunrise
Thu -- 08:23 AM PDT     Moonrise
Thu -- 12:31 PM PDT     1.64 feet Low Tide
Thu -- 06:37 PM PDT     10.93 feet High Tide
Thu -- 07:08 PM PDT     Sunset
Thu -- 08:13 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.12.23.55.57.69.410.21097.2531.81.8357.49.510.710.9108.46.13.8

Tide / Current Tables for Restoration Point, 0.6 miles ESE of, Washington Current
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Restoration Point
Click for Map
Thu -- 01:16 AM PDT     0.01 knots Slack
Thu -- 03:16 AM PDT     0.60 knots Max Flood
Thu -- 06:33 AM PDT     -0.00 knots Slack
Thu -- 06:55 AM PDT     Sunrise
Thu -- 08:24 AM PDT     Moonrise
Thu -- 09:53 AM PDT     -0.89 knots Max Ebb
Thu -- 01:23 PM PDT     0.00 knots Slack
Thu -- 03:29 PM PDT     0.63 knots Max Flood
Thu -- 06:49 PM PDT     -0.00 knots Slack
Thu -- 07:08 PM PDT     Sunset
Thu -- 08:13 PM PDT     Moonset
Thu -- 10:15 PM PDT     -0.96 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.5-0.10.30.60.60.40.2-0.2-0.5-0.8-0.9-0.8-0.5-0.10.30.60.60.50.2-0.1-0.5-0.8-1-0.9

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 (4,6,7,8)
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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.