Wednesday, September26, 2018 L-36.com


Marine Weather and Tides
Snoqualmie, WA

Version 3.4
What's New / NOTES
9/17/2018 XTide broke when 1and1 "upgraded" my server. It has been esculated. I am sorry for the problem.

Sunrise 7:00AMSunset 6:57PM Wednesday September 26, 2018 4:36 AM PDT (11:36 UTC) Moonrise 7:09PMMoonset 7:28AM Illumination 97% Phase: Waning Gibbous; Moon at 16 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- 244 Am Pdt Wed Sep 26 2018
Today..N wind to 10 kt. Wind waves 1 ft or less. Patchy fog in the morning.
Tonight..N wind to 10 kt. Wind waves 1 ft or less.
Thu..N wind to 10 kt rising to 5 to 15 kt in the afternoon. Wind waves 2 ft or less.
Thu night..N wind to 10 kt becoming ne 5 to 15 kt after midnight. Wind waves 2 ft or less.
Fri..N wind 5 to 15 kt easing to 10 kt in the afternoon. Wind waves 2 ft or less.
Fri night..N wind to 10 kt in the evening becoming light. Wind waves 1 ft or less.
Sat..S wind 5 to 15 kt. Wind waves 2 ft or less.
Sun..S wind to 10 kt. Wind waves 1 ft or less.
PZZ100 244 Am Pdt Wed Sep 26 2018
Synopsis for the northern and central washington coastal and inland waters..Northerly flow will continue this week with high pressure offshore and thermal low pressure near the oregon coast. Onshore flow and weather systems may return later this weekend.


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 261048
afdsew
area forecast discussion
national weather service seattle wa
300 am pdt Wed sep 26 2018

Synopsis An upper level ridge over the northeast pacific and
offshore flow over western washington will provide mostly clear
skies with relatively warm days and cool, clear nights this week.

Light northerly flow will turn more easterly Friday making that day
the warmest day of the week. The ridge weakens allowing a system to
drop south over the western washington this weekend with a threat of
showers Saturday into early next week.

Short term A strong 5950m upper ridge is centered near 135w
and 45n over the NE pacific. The ridge will continue to amplify
through Thursday, then begin to weaken Friday. Models agree on dry
low level northerly flow the next couple days which will provide
sunny days and near average temperatures. Some thin high clouds
brushing the area will have little almost no impact on our weather,
except possibly a slight reduction in radiative cooling effects that
could hold up low temperatures in cold pockets by a couple degrees.

Patchy fog will likely form in prone valleys this morning and
perhaps Thursday morning, but the dry north flow at the surface
should keep coverage limited to mainly prone sheltered areas. Any
fog should dissipate by mid morning with highs reaching the upper
60s to low 70s, warmest over south and east interior lowlands.

The ridge shifts even further northward into the gulf of alaska
Friday and weakens through Friday night as systems begin to undercut
the upper high. Warmest high temperatures over western washington
will likely occur Friday as the thermally induced trough shifts off
the coast giving a period of offshore easterly flow. The air mass
east of the crest will be cool, but downslope warming on the west
side should give a few degrees boost to high temperatures which may
reach the mid to upper 70s around parts of puget sound. A few spots
could reach near 80 near the foothills east lowlands and southwest
interior. Sunshine will prevail with dry easterly flow not allowing
much if any fog to develop.

Long term Both the GFS and ecwmf indicate a shift in the pattern
this weekend but differ on timing and details. A system will drive
southward on Saturday as the ridge dissipates off the b.C. Coast.

Models also show another separate weak cut off low that may eject
northeast into oregon Saturday night or Sunday. The degree to which
these two systems interact will determine how much moisture arrives
off the pacific and the strength of the front which would provide
lift. The GFS is indicating the weak cut off low feature is the only
player this weekend and indicates a northern stream front not
arriving early next week as a second closed low moves into the
region. This solution would not produce much precipitation over the
weekend but would begin a cooling trend with wet weather Monday
through mid week. The ECMWF drives a front south much quicker,
reaching western washington late Saturday into Sunday just as
moisture from a weak system offshore moves in. Either solution is
plausible with the canadian model not a bad model of choice given
the differences in timing strength between the GFS ecmwf. Kept pops
mostly in the chance category this weekend into early next week with
little trend in models that would narrow down the most likely period
of showers. Mercer

Aviation High pressure remains centered offshore with northwest
flow aloft over the region. Low level flow is northerly. The air
mass is dry and stable with the exception of some patchy morning fog
in the river valleys that is expected to burn off quickly.

Ksea... Clear skies. North winds generally 5 to 10 knots. 27

Marine High pressure offshore and thermal low pressure to the
south will continue through the end of the week, giving northerly
flow. Onshore flow should return over the weekend as a weather
system approaches the area.

Sew watches warnings advisories
Wa... None.

Pz... None.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
EBSW1 - 9447130 - Seattle, WA 27 mi37 min Calm G 1.9 56°F 56°F1023.9 hPa (+0.0)
WPOW1 - West Point, WA 33 mi37 min N 8 G 8.9 55°F 1024.1 hPa (+0.0)52°F
TCMW1 - 9446482 - Tacoma Met, WA 35 mi37 min ESE 1.9 G 2.9
TCNW1 - 9446484 - Tacoma, WA 35 mi37 min 51°F 56°F1024.2 hPa (+0.0)

Wind History for Seattle, Puget Sound, WA, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Renton Municipal Airport, WA20 mi44 minN 010.00 miFair51°F46°F86%1024.3 hPa
Boeing Field - King County International Airport, WA24 mi44 minN 010.00 miFair53°F48°F83%1023.8 hPa

Wind History from RNT (wind in knots)
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Last 24hrCalmS3CalmCalmCalmNW8N5N7NW7NW9NW12NW11NW9NW10NW11NW8NW7NW7NW8N5NW6NW6CalmCalm
1 day agoCalmCalmCalmE3CalmNW3NW5NW6NW8NW9NW11NW12NW12NW10NW10NW11N5CalmNW4N5CalmCalmCalmS3
2 days agoSE4E3SE3SE3SE5S6SE3S5Calm--S7CalmN44CalmNW3CalmSE3CalmCalmSE34SE3SE3

Tide / Current Tables for Duwamish Waterway, Washington
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Tide / Current data from XTide NOT FOR NAVIGATION
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Tide / Current Tables for Seattle, Washington
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Tide / Current data from XTide NOT FOR NAVIGATION
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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 (7,2,3,4)
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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.