Wednesday, September20, 2017 L-36.com


Marine Weather and Tides
SeaTac, 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 6:53AMSunset 7:10PM Wednesday September 20, 2017 12:38 AM PDT (07:38 UTC) Moonrise 6:16AMMoonset 6:46PM Illumination 0% Phase: New Moon; Moon at 29 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 Tue Sep 19 2017
Tonight..N wind to 10 kt except sw wind to 10 kt south of seattle. Wind waves 1 ft. Showers in the evening then a chance of showers after midnight.
Wed..Light wind becoming nw to 10 kt in the afternoon. Wind waves 1 ft or less. A chance of showers.
Wed night..S wind to 10 kt. Wind waves 1 ft or less. A slight chance of showers.
Thu..S wind to 10 kt. Wind waves 1 ft or less.
Thu night..N wind to 10 kt. Wind waves 1 ft or less.
Fri through Sun..Light wind.
PZZ100 900 Pm Pdt Tue Sep 19 2017
Synopsis for the northern and central washington coastal and inland waters..A trough over the inland waters this evening will move east of the area overnight. Another trough will move into oregon on Wednesday. High pressure will build Friday and Saturday.

7 Day Forecast for Marine Location Near SeaTac, WA
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location: 47.42, -122.28     debug


Area Discussion for - Seattle, WA
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Fxus66 ksew 200415
afdsew
area forecast discussion
national weather service seattle wa
915 pm pdt Tue sep 19 2017

Synopsis Low pressure aloft will remain over the region through
Wednesday for cool and unsettled conditions. High pressure aloft
will gradually move over the area from the west the latter part of
the week for a drying and warming trend. An upper ridge will remain
over the area into early next week.

Short term Showers and a few thunderstorms moved over the area
this afternoon and evening. Thunderstorms have ended and showers are
on the downswing. An upper trough will be over the area tonight,
keeping scattered showers in the forecast.

An upper short wave will move onshore late tonight and Wednesday
morning, brushing the southern part of the forecast area and
bringing another shot of organized showers to the south. The
mountains above 5000 feet will probably pick up more snow tonight
and Wednesday. Paradise will probably get the most with maybe 2-4
inches. Further north, showers will be more isolated later tonight
and Wednesday. Highs will be near 60.

Drier northerly flow aloft will develop Thursday and Friday as the
upper trough shifts inland. A few showers will linger, mostly over
the mountains, especially by Friday. Highs will rise a few degrees
each day but remain a little below normal. Schneider burke

Long term Previous discussion... An upper ridge will be just
offshore Saturday through Tuesday. The ridge is looking more dirty
compared to yesterday. The GFS is dry but the ECMWF brings some
precipitation over the top of the ridge and into western washington
at times. The forecast is dry for now but some pops may need to be
introduced if models continue to trend the direction of the ec.

Temperatures should warm back to near normal during this period.

Schneider

Aviation An upper level trough over western washington shifting
east late Wednesday. Light flow aloft becoming northerly
Wednesday afternoon. The air is moist and unstable with onshore
flow and scattered showers. The mountains will remain mostly
obscured. Puget sound convergence zone over northern snohomish
county moving into cascades overnight.

Ksea... Scattered to broken layer around 2500 feet with multiple
layers between 4000 and 7000 feet. Lower deck dissipating late
Wednesday morning. Scattered showers into Wednesday morning.

Convergence zone staying north of the terminal. Variable winds 5
knots or less. Felton

Marine Trough over inland waters will continue to shift east
tonight. Next trough will move inland over oregon on Wednesday.

High pressure will build into the area Friday and Saturday. Swell
over the coastal waters around 13 feet will subside to around 8
feet Wednesday. Felton

Sew watches warnings advisories
Wa... None.

Pz... Small craft advisory for hazardous seas until 2 am pdt Wednesday
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-west entrance u.S.

Waters strait of juan de fuca.

Small craft advisory for rough bar until 2 am pdt Wednesday for
grays harbor bar.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
TCMW1 - 9446482 - Tacoma Met, WA 12 mi50 min ESE 2.9 G 4.1
TCNW1 - 9446484 - Tacoma, WA 13 mi56 min 55°F1006.5 hPa
EBSW1 - 9447130 - Seattle, WA 13 mi50 min E 4.1 G 5.1 55°F1006.4 hPa
WPOW1 - West Point, WA 19 mi38 min E 6 G 8.9 52°F 1006.3 hPa (-1.6)49°F
46120 24 mi45 min SE 9.7 53°F 1005.6 hPa50°F
46121 26 mi41 min 1.9 54°F 1005.3 hPa47°F

Wind History for Tacoma MET, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Seattle, Seattle-Tacoma International Airport, WA2 mi45 minSE 310.00 miMostly Cloudy53°F46°F80%1006.7 hPa
Renton Municipal Airport, WA6 mi45 minN 010.00 miMostly Cloudy53°F52°F96%1006.6 hPa
Boeing Field - King County International Airport, WA8 mi45 minESE 410.00 miMostly Cloudy51°F51°F100%1006.1 hPa
Tacoma, Tacoma Narrows Airport, WA19 mi45 minSSE 410.00 miFair51°F48°F89%1005.8 hPa
Tacoma / McChord Air Force Base, WA21 mi1.7 hrsS 510.00 miMostly Cloudy50°F49°F99%1007.1 hPa
Pierce County-Thun Field, WA22 mi63 minN 010.00 miOvercast48°F48°F100%1006.4 hPa

Wind History from SEA (wind in knots)
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Last 24hrS8S9S8S8S7S7S12S7S7S12S10SW10SW10SW9SW10S9SW12SW15
G23
N7N3N3S4CalmSE3
1 day agoW3CalmNW3S7S9S8S7S8S9S9S9SW10SW15S13S12S8SE9SE8S10S10S8S11S12S10
2 days agoSE4S4SE4S5S8S5S7S9S9S10S8SW12SW12S12S5SE7SE5SE8S9S10S10S5SW6SW3

Tide / Current Tables for Des Moines, Washington
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Des Moines
Click for Map
Wed -- 05:32 AM PDT     10.85 feet High Tide
Wed -- 06:53 AM PDT     Sunrise
Wed -- 07:16 AM PDT     Moonrise
Wed -- 11:47 AM PDT     0.99 feet Low Tide
Wed -- 06:12 PM PDT     11.86 feet High Tide
Wed -- 07:10 PM PDT     Sunset
Wed -- 07:46 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.93.85.67.79.610.710.79.87.95.53.11.411.93.96.59.11111.811.510.17.95.43.3

Tide / Current Tables for Skagit Bay, 1 mile N of Rocky Point, Washington Current
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Skagit Bay
Click for Map
Wed -- 12:37 AM PDT     0.00 knots Slack
Wed -- 04:06 AM PDT     0.75 knots Max Flood
Wed -- 05:43 AM PDT     -0.01 knots Slack
Wed -- 06:54 AM PDT     Sunrise
Wed -- 07:16 AM PDT     Moonrise
Wed -- 11:01 AM PDT     -1.27 knots Max Ebb
Wed -- 12:40 PM PDT     0.00 knots Slack
Wed -- 04:25 PM PDT     0.94 knots Max Flood
Wed -- 06:18 PM PDT     -0.00 knots Slack
Wed -- 07:11 PM PDT     Sunset
Wed -- 07:47 PM PDT     Moonset
Wed -- 11:32 PM PDT     -1.28 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.60.10.50.70.80.5-0.1-0.4-0.8-1-1.2-1.3-0.70.10.50.80.90.80.3-0.3-0.6-0.9-1.1-1.3

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.