Tuesday, April24, 2018 L-36.com


Marine Weather and Tides
Mercer Island, WA

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
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.

Sunrise 5:59AMSunset 8:13PM Tuesday April 24, 2018 5:24 AM PDT (12:24 UTC) Moonrise 1:12PMMoonset 2:52AM Illumination 67% Phase: Waxing Gibbous; Moon at 9 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- 144 Am Pdt Tue Apr 24 2018
Today..N wind 5 to 15 kt. Wind waves 2 ft or less.
Tonight..N wind 5 to 15 kt becoming to 10 kt after midnight. Wind waves 2 ft or less.
Wed..N wind 5 to 15 kt becoming 10 to 20 kt in the afternoon. Wind waves 1 to 3 ft.
Wed night..N wind 5 to 15 kt. Wind waves 2 ft or less.
Thu..Light wind. Wind waves less than 1 ft.
Thu night..NW wind to 10 kt in the evening becoming light. Wind waves 1 ft or less.
Fri..SW wind 5 to 15 kt. Wind waves 2 ft or less.
Sat..S wind to 10 kt. Wind waves 1 ft or less.
PZZ100 144 Am Pdt Tue Apr 24 2018
Synopsis for the northern and central washington coastal and inland waters..High pressure inland with thermally induced low pressure along the oregon and washington coasts will persist until about Thursday morning. The thermal low pressure will move inland on Thursday with onshore flow developing Thursday night and Friday.

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 241001
afdsew
area forecast discussion
national weather service seattle wa
300 am pdt Tue apr 24 2018

Synopsis Upper level ridging over washington will keep conditions
dry through Thursday. Warm temperatures are also expected with many
locations seeing afternoon highs in the 70s. An upper level low will
approach from the southwest late in the week bringing a return to
seasonably cool temperatures and a chance of showers Friday and
into next weekend.

Short term A bit of a spread in temperatures this early morning
across W wa... With the southern half of the CWA seeing temps in the
50s while the northern half is stuck in the 40s... All under some
scattered high clouds.

The upper level ridge responsible for this stretch of dry conditions
looks to remain in place today before gradually moving southeastward
Wednesday. Not much of a change in the weather though... As an upper
low plunging into western montana will actually put W wa under the
influence of a secondary ridge... Allowing dry and warm conditions to
persist into at least Thursday afternoon. Looking at surface
features... A surface high over the area will allow for offshore
flow... Helping to push temps up a degree or two each day. Warmest
day of the week looks to be Thursday... With the potential for some
locations to crack 80 degrees.

Locally breezy to windy conditions still a possibility over the
cascade foothills this morning. Pressure gradients continue to
gradually relax... But the prospect for wind gusts up to 30 to 40 mph
will still be in play through the morning hours. Otherwise... No
other significant wind issues expected for the area.

All in all... About as quiet a short term forecast as one could hope
for. Smr

Long term A change over to onshore flow starting as early as
Thursday evening will start to signal a change in the pattern. An
upper level low over the pacific making its way toward southern
or northern ca will push up showers from the southwest up into W wa
late Friday morning early Friday afternoon. While models do not
particularly agree on the details of this low... Its movement track
or the presence of any secondary systems that may either follow it
(ecmwf) or fold into it (gfs)... The broad strokes end up lining up
with showery weather expected for much of the upcoming weekend and
temperatures cooling to more seasonal values with afternoon highs in
lowland locations during this time frame only reaching the mid 50s.

Smr

Aviation An upper ridge axis is centered along the cascades this
morning with light southerly flow aloft over western washington. The
air mass is dry and stable with little more than some thin high
level moisture crossing the region. At the surface, low level
offshore flow will continue today as a ridge remains anchored east
of the cascades with thermally-induced low pressure along the coast.

Ksea...VFR through the day and tonight with just some high clouds at
times. Low level offshore flow continues today. The cross-cascade
gradient should peak 12z-15z. East-northeast wind 6 to 10 knots
through early this morning becoming northerly 7 to 12 knots from mid
morning through the evening. 27

Marine High pressure inland and thermally induced low pressure
along the oregon and washington coast will persist until about
Thursday morning. This pattern leads to northerly offshore flow.

Small craft advisory strength easterlies are forecast this morning
and again on Wednesday morning in the vicinity of CAPE flattery.

The thermally induced low pressure will move inland on Thursday
with onshore flow developing Thursday night and Friday. Westerly
flow through the strait should peak on Friday night. Haner

Sew watches warnings advisories
Wa... None.

Pz... Small craft advisory until 1 pm pdt this afternoon for coastal
waters from CAPE flattery to james island out 10 nm-west
entrance u.S. Waters strait of juan de fuca.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
EBSW1 - 9447130 - Seattle, WA 6 mi54 min S 1.9 G 2.9 52°F 48°F1023.4 hPa
WPOW1 - West Point, WA 13 mi84 min NNE 11 G 12 50°F 1023.5 hPa (-0.9)45°F
46120 17 mi57 min 7.8 49°F 44°F
TCMW1 - 9446482 - Tacoma Met, WA 20 mi54 min SSE 4.1 G 4.1
TCNW1 - 9446484 - Tacoma, WA 21 mi54 min 47°F 49°F1022.8 hPa
46121 31 mi63 min 50°F 1022.7 hPa40°F
PTWW1 - 9444900 - Port Townsend, WA 48 mi54 min SSE 2.9 G 4.1 46°F 49°F1024.5 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 mi31 minN 010.00 miFair48°F37°F68%1023 hPa
Renton Municipal Airport, WA3 mi31 minNNW 510.00 miFair50°F41°F71%1023.2 hPa
Seattle, Seattle-Tacoma International Airport, WA7 mi31 minN 1110.00 miFair52°F35°F53%1023.2 hPa

Wind History from BFI (wind in knots)
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Last 24hrCalm3CalmNE365NW7NW10NW10
G18
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NW6NW6NE5CalmNW4CalmCalmCalmCalm4N3Calm
1 day agoCalmCalm354E8NW65NW9
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NW93NW5N3NW4NW4CalmCalmCalmCalmCalmCalmN3
2 days agoS12
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S93S7SW5SW11N3NE5SE4E54NE4CalmNE3334NE3CalmCalmCalm

Tide / Current Tables for Duwamish Waterway, Washington
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Duwamish Waterway
Click for Map
Tue -- 01:36 AM PDT     11.14 feet High Tide
Tue -- 03:52 AM PDT     Moonset
Tue -- 06:03 AM PDT     Sunrise
Tue -- 07:54 AM PDT     5.23 feet Low Tide
Tue -- 12:35 PM PDT     8.22 feet High Tide
Tue -- 02:12 PM PDT     Moonrise
Tue -- 07:25 PM PDT     0.87 feet Low Tide
Tue -- 08:11 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
101111.110.49.27.76.35.55.25.66.47.48.18.27.66.553.31.8112.13.96.2

Tide / Current Tables for Restoration Point, 0.6 miles ESE of, Washington Current
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Restoration Point
Click for Map
Tue -- 01:33 AM PDT     -0.00 knots Slack
Tue -- 03:52 AM PDT     Moonset
Tue -- 04:54 AM PDT     -0.69 knots Max Ebb
Tue -- 06:04 AM PDT     Sunrise
Tue -- 09:02 AM PDT     0.00 knots Slack
Tue -- 10:11 AM PDT     0.19 knots Max Flood
Tue -- 12:36 PM PDT     -0.00 knots Slack
Tue -- 02:13 PM PDT     Moonrise
Tue -- 04:38 PM PDT     -0.75 knots Max Ebb
Tue -- 08:12 PM PDT     Sunset
Tue -- 08:15 PM PDT     0.00 knots Slack
Tue -- 10:44 PM PDT     0.65 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.40.1-0.1-0.4-0.6-0.7-0.6-0.4-0.2-00.20.20.1-0.1-0.3-0.6-0.7-0.7-0.6-0.4-0.10.30.60.6

Weather Map and Satellite Images
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wmap_P
GOES 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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Seattle, WA (8,2,3,4)
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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 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.