Tuesday, October17, 2017 L-36.com


Marine Weather and Tides
Snoqualmie, 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 7:30AMSunset 6:16PM Tuesday October 17, 2017 5:15 PM PDT (00:15 UTC) Moonrise 4:00AMMoonset 4:46PM Illumination 6% Phase: Waning Crescent; Moon at 27 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- 248 Pm Pdt Tue Oct 17 2017
.small craft advisory in effect until 5 pm pdt this afternoon...
.gale warning in effect from Wednesday morning through Wednesday evening...
Tonight..S wind 15 to 25 kt early easing to 5 to 15 kt. Except nw wind 5 to 15 kt north part becoming S after midnight. Wind waves 2 to 4 ft subsiding to 2 ft or less.
Wed..S wind 10 to 20 kt rising to 25 to 35 kt. Wind waves 1 to 3 ft building to 4 to 6 ft. Rain.
Wed night..S wind 25 to 35 kt easing to 15 to 25 kt after midnight. Wind waves 4 to 6 ft subsiding to 2 to 4 ft after midnight. Rain.
Thu..S wind 5 to 15 kt. Wind waves 2 ft or less.
Thu night..S wind 10 to 20 kt. Wind waves 1 to 3 ft.
Fri..SW wind 5 to 15 kt becoming 10 to 20 kt in the afternoon. Wind waves 1 to 3 ft.
Fri night..SW wind 5 to 15 kt becoming se after midnight. Wind waves 2 ft or less.
Sat..S wind 5 to 15 kt. Wind waves 2 ft or less.
Sun..SW wind 5 to 15 kt. Wind waves 2 ft or less.
PZZ100 248 Pm Pdt Tue Oct 17 2017
Synopsis for the northern and central washington coastal and inland waters..Onshore flow will ease across the region tonight. Another strong frontal system will affect the area on Wednesday with gales expected over most waters. Onshore flow will prevail Thursday and Friday with swells reaching 20 feet. A second strong frontal system will reach the area Saturday.

7 Day Forecast for Marine Location Near Snoqualmie, WA
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location: 47.53, -121.84     debug


Area Discussion for - Seattle, WA
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Fxus66 ksew 172255
afdsew
area forecast discussion
national weather service seattle wa
355 pm pdt Tue oct 17 2017

Synopsis Mainly dry conditions are expected across the area
tonight. A strong warm front on Wednesday will bring heavy rain
and locally strong winds to the area. A cold front on Thursday
will push the heavy rain out of the area, but it will be followed
by numerous showers later Thursday into Friday night. Another
strong front will pass across the pacific northwest on Saturday
and Saturday night. Drier weather may develop early next week as a
ridge of high pressure strengthens to our south.

Short term With exception to the west slopes of the cascades
and around the puget sound convergence zone over king and
snohomish counties, skies have cleared somewhat behind this
morning's front. Isolated showers and a clap or two of thunder can
be expected until about 6 pm in the convergence zone. Dry, cool
and tranquil conditions will continue through tonight.

Latest models continue to show rainfall rapidly spreading east
across the area by about 8 am Wednesday as a warm front moves
through the area. The warm front will stall across northern
portions of the area Wednesday afternoon then pivot and push
slowly southeast across the area later Wednesday night. Winds
at 5000 ft aloft in the warm air mass are forecast to be wsw 50-65
kt Wednesday and Wednesday night. These strong winds aloft
interacting with the terrain, combined with a somewhat unstable
air mass and moisture originating from the tropical western
pacific, will produce impressive rainfall rates Wednesday
afternoon and evening. The interaction of the flow aloft with the
terrain will also form a low level coastal jet and a mesolow in
the lee of the olympics. The end result will be windy conditions
across the area from about olympia and westport northward and a
period of heavy rainfall. We now have high wind warnings in effect
for the washington coastal zones and for the interior from
everett northward from 11 am til 11 pm pdt Wednesday. Wind
advisories have been issued for the same time frame from south of
everett to southern pierce and kitsap counties. The expected wind
speeds are about 10-15 mph higher than what we experienced with
this morning's weaker front. We would not typically issue wind
warnings and advisories for the expected level of wind, but trees
have been stressed from the dry summer and there are many dead
branches that need nature's pruning. The falling of larger
branches may result in some power outages and local damage as they
hit wires, and outages will likely be quite a bit more extensive
than this morning.

Heavy rainfall will primarily fall in an 18 hour period Wednesday
afternoon through Wednesday night, while snow levels will rise to
well over 7000 feet. This will result in river rises and the
threat for street and small stream flooding during the evening
commute on Wednesday. See the hydrology section below for more
information.

Precipitation will taper to numerous showers later Thursday
through Friday night and snow levels will fall back down to 3500
to 4000 feet. Albrecht

Long term A strong warm front will move into the area on
Saturday and may result in another period of heavy rainfall and
strong winds. The GFS takes the brunt of the energy with this next
system into northern oregon, while the ECMWF is a bit farther
north and gives more a prolonged period of heavy rain. This
system will need to be monitored closely for the threat of
flooding.

Later Sunday or Monday flat ridging aloft will build to the south
of the area taking systems more into western portions of british
columbia. The forecast will call for drying and high temperatures
warming to near 60 by next Tuesday. Albrecht

Aviation Onshore flow and surface winds will ease this evening
across western washington. Skies have cleared behind a cold front
except for a band over snohomish and king counties where there's
a convergence zone. Otherwise, there will be a lull in the weather
tonight. Wednesday will be wet and windy again as another strong
pacific system impacts the region. The coast and north interior
will see gusty S winds to 35-45 kt. Rain will be moderate to heavy
at times along the coast and mountains. Rain will increase in
coverage Wednesday evening as a frontal band shifts SE through the
area. Expect MVFR to ifr conditions through much of the day. 33
ksea... Showers from a convergence zone remaining north of the
terminal tonight. S SW wind easing. Increasing clouds and S winds
on Wednesday as the next system arrives. Gusty S winds to 30kt by
21z.

Marine Onshore flow will ease tonight with winds turning S se
after midnight. Expect another round of gales on Wednesday as a
second strong pacific system impacts the region. Strong onshore
flow will continue through Thursday and Friday with seas building
to 20-24 feet. A third vigorous storm system will reach the area
on Saturday. 33

Hydrology Heavy rainfall is expected Wednesday through
Wednesday night. The main focus of the precipitation will be on
southwest facing slopes of the olympics and north cascades.

Precipitation amounts of 5 to 8 inches can be expected in the
olympics, while the north cascades see 4 to 6 inches and the
lowlands see up to 3 inches. The heavy rainfall rates are
accompanied by high snow levels well over 7000 feet. Models do not
show flooding on area rivers, but bring the river stages close
enough (within a foot) on the skokomish, nooksack, stillaguamish,
and skagit that flood watches have been issued for Wednesday
afternoon through midday Thursday for snohomish, skagit, whatcom
and mason counties in case rainfall is any heavier than currently
forecast. Lowland locations may see urban and small stream
flooding due to the combination of high rain rates and drainage
issues due to leaves clogging drains.

Rivers will recede later Thursday through Friday night as snow
levels drop to around 3500 feet and precipitation becomes more
showery.

Rivers could quickly rise later Saturday into Sunday with the
weekend system. The ECMWF is warmer and heavier with precipitation
amounts and shows a more classic atmospheric river pattern for
about 24 hours. With rivers starting from a higher point, minor
flooding is possible on some rivers across the area.

Conditions will dry out starting later Sunday or Monday of next
week allowing all rivers to recede. Albrecht.

Sew watches warnings advisories
Wa... Wind advisory from 11 am to 11 pm pdt Wednesday for bellevue and
vicinity-bremerton and vicinity-hood canal area-seattle and
vicinity-tacoma area.

Flood watch from Wednesday afternoon through Thursday morning
for whatcom, skagit, snohomish, and mason counties.

High wind warning from 11 am to 11 pm pdt Wednesday for
admiralty inlet area-central coast-everett and vicinity-
north coast-san juan county-western skagit county-western
whatcom county.

Pz... Small craft advisory for rough bar until 11 pm pdt this evening
for grays harbor bar.

Small craft advisory until 4 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.

Gale warning from 4 am to 9 pm 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.

Small craft advisory until 11 pm pdt this evening for east
entrance u.S. Waters strait of juan de fuca-northern inland
waters including the san juan islands.

Gale warning from 4 am to 6 pm pdt Wednesday for admiralty inlet-
east entrance u.S. Waters strait of juan de fuca-northern
inland waters including the san juan islands.

Small craft advisory until 11 pm pdt Wednesday for west entrance
u.S. Waters strait of juan de fuca.

Small craft advisory until 5 pm pdt Wednesday for central u.S.

Waters strait of juan de fuca.

Small craft advisory until 5 pm pdt this afternoon for admiralty
inlet-puget sound and hood canal.

Gale warning from 11 am to 9 pm pdt Wednesday for puget sound
and hood canal.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
EBSW1 - 9447130 - Seattle, WA 27 mi46 min NE 5.1 G 9.9 57°F 54°F1020.2 hPa
WPOW1 - West Point, WA 33 mi76 min ENE 11 G 14 56°F 1020.3 hPa (+2.6)47°F
46120 34 mi45 min ENE 9.7 54°F 1019.6 hPa47°F
TCMW1 - 9446482 - Tacoma Met, WA 35 mi46 min SW 9.9 G 18
TCNW1 - 9446484 - Tacoma, WA 35 mi46 min 60°F 55°F1020.5 hPa

Wind History for Seattle, Puget Sound, WA, WA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Renton Municipal Airport, WA20 mi23 minS 610.00 miPartly Cloudy60°F42°F52%1020.3 hPa
Boeing Field - King County International Airport, WA24 mi23 minSE 710.00 miPartly Cloudy59°F42°F54%1019.9 hPa

Wind History from RNT (wind in knots)
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Last 24hrSE8S7S8SE7SE5SE4E4SE3SE5SE6SE6SE5SE6SE6SE11
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1 day agoW3NW5NW4CalmCalmCalmCalmCalmCalmSE4CalmSE4SE4SE4SE4SE3S5SE8SE10SE8S8S10
G17
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2 days agoCalmCalmCalmCalmCalmCalmCalmS3CalmCalmCalmCalmCalmSE3CalmCalmCalmN4NW54NW6NW5NW5NW4

Tide / Current Tables for Duwamish Waterway, Washington
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Duwamish Waterway
Click for Map
Tue -- 03:54 AM PDT     9.44 feet High Tide
Tue -- 05:01 AM PDT     Moonrise
Tue -- 07:31 AM PDT     Sunrise
Tue -- 10:02 AM PDT     1.99 feet Low Tide
Tue -- 04:20 PM PDT     11.23 feet High Tide
Tue -- 05:48 PM PDT     Moonset
Tue -- 06:16 PM PDT     Sunset
Tue -- 10:49 PM PDT     1.88 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.46.27.99.19.497.75.942.522.546.28.510.311.2119.985.73.62.21.9

Tide / Current Tables for Seattle, Washington
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Seattle
Click for Map
Tue -- 03:53 AM PDT     9.74 feet High Tide
Tue -- 05:01 AM PDT     Moonrise
Tue -- 07:31 AM PDT     Sunrise
Tue -- 09:51 AM PDT     2.09 feet Low Tide
Tue -- 04:19 PM PDT     11.57 feet High Tide
Tue -- 05:48 PM PDT     Moonset
Tue -- 06:16 PM PDT     Sunset
Tue -- 10:38 PM PDT     1.98 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.86.68.39.49.79.27.85.93.92.52.12.84.46.78.910.711.511.310.18.15.63.52.22.1

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 (20,4,5,8)
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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.