Wednesday, June20, 2018 L-36.com


Marine Weather and Tides
Snoqualmie, WA

Version 3.4
What's New / NOTES
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 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.

Sunrise 5:08AMSunset 9:11PM Wednesday June 20, 2018 5:51 PM PDT (00:51 UTC) Moonrise 12:25PMMoonset 12:31AM Illumination 51% Phase: First Quarter Moon; Moon at 8 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- 300 Pm Pdt Wed Jun 20 2018
Tonight..N wind 5 to 15 kt becoming S 10 to 20 kt after midnight. Wind waves 1 to 3 ft. A slight chance of tstms in the evening.
Thu..SW wind 5 to 15 kt. Wind waves 2 ft or less.
Thu night..Variable wind 5 to 15 kt becoming se after midnight. Wind waves 2 ft or less.
Fri..Variable wind to 10 kt. Wind waves 1 ft or less.
Fri night..N wind to 10 kt becoming variable after midnight. Wind waves 1 ft or less.
Sat..Light wind becoming N to 10 kt in the afternoon. Wind waves 1 ft or less.
Sat night..N wind to 10 kt becoming ne after midnight. Wind waves 1 ft or less.
Sun..N wind 5 to 15 kt. Wind waves 2 ft or less.
Mon..NE wind to 10 kt becoming n. Wind waves 1 ft or less.
PZZ100 300 Pm Pdt Wed Jun 20 2018
Synopsis for the northern and central washington coastal and inland waters..Strong onshore flow will develop this afternoon through tonight. Gale force westerlies are likely in the strait. Onshore flow will remain through the weekend and gales in the strait are possible each afternoon and evening.

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 202228
afdsew
area forecast discussion
national weather service seattle wa
330 pm pdt Wed jun 20 2018

Synopsis An upper ridge east of the cascades will bring another
day of near record high temperatures to western washington today,
with partly to mostly sunny skies and a chance of thunderstorms
late in the day. Onshore flow will bring cooler marine air inland
Thursday and Friday. High pressure aloft will cross the region
this weekend, followed by an upper trough early next week.

Short term Showers and thunderstorms are starting to pop up on
the radar... Mostly over the cascades but there is an isolated cell
out on the olympic peninsula. Will include this area under the
thunderstorm threat for the evening hours with the upcoming forecast
package. Aside from that... Not seeing much movement off the
mountains... But still plenty of time for that to occur... Given that
model progs not really expecting much of a lowland thunderstorm
threat until after 00z late this afternoon. Looking over
temperatures... Most locations running warmer than this time
yesterday which was expected. The exception to this being
hoquiam... Where clouds have remained in place over the area keeping
temps suppressed. Looking over the actual temperatures at the time
of this writing it appears olympia has already tied its record for
the day of 89... Tacoma is reporting 90 and sea-tac is just shy of
its record at 85.

Aside from including the olympics under the thunder threat for this
evening... Not much in the way of changes to the forecast as model
solutions remain consistent for the near term. Showers and
thunderstorms will diminish tonight and an upper level trough will
start to move inland. Strong onshore flow is expected to accompany
this trough triggering a good marine push... Resulting in plenty of
low clouds overnight and into the morning Thursday with perhaps even
some drizzle along the coast. Most importantly... This will lower
temperatures considerably with highs across the interior lowlands in
the upper 60s and 70s.

Another upper trough will move into western washington Thursday
night and Friday. This feature will be better defined, but will
only bring a chance of light showers to the area -- mainly the
coast, mountains, and eventually in the puget sound convergence
zone Friday evening. Friday will be a bit cooler yet, with highs
mainly in the mid 60s to lower 70s.

An upper level ridge will follow... Starting to impact the area
during the overnight hours Friday night and dry conditions and
warmer temperatures expected for Saturday. Temperatures will
increase only a few degrees with mid to upper 60s expected along the
coast and low to mid 70s in the interior lowlands. Smr

Long term The aforementioned ridge does not last very long over
the area as the ridge axis exiting Saturday night and the feature
itself east of the area by late Sunday morning... Setting up the next
main weather factor over the area... An upper level trough with its
associated low situated well north of the canadian border. Models
still not really syncing up with this feature when it comes to the
details... And precip signatures with both GFS and ECMWF are pretty
weak... So while pops are present in the extended... They are confined
to the northern third of the CWA and only get as high as low-end
chance wording... While partly to mostly sunny skies are expected for
the remainder of the area. This feature will keep temps over W wa
right near seasonal normals... With lowland temps hovering right
around 70 degrees. Smr

Aviation Light southwest flow aloft tonight will become more
westerly Thursday. The air mass is moist and unstable in mid and
upper levels with thunderstorms over the cascades and olympics and
adjacent lowlands. Most convection should die out by sunset at 04z.

Thunderstorms may impact the terminals around puget sound before
then and they are carried in several tafs.

Low level onshore flow will become strong this evening and will
bring a marine layer inland across much of the interior of western
washington for ifr or low MVFR ceilings Thursday morning.

Ksea... Discussion above applies. TAF has a tempo group for thunder
23z-03z. Ceilings will beVFR until after 11z when marine stratus
will bring MVFR ceilings. Northwest wind 4-8 kt this afternoon
becoming southerly 5-10 kt overnight. Chb

Marine Strong onshore flow will develop late this afternoon and
tonight. A gale warning is in effect for the strait, with small
craft advisories for adjacent waters.

Moderate to strong onshore pressure gradients will continue each day
through the weekend. Winds of at least small craft advisory strength
are likely each day in the strait, with gale force winds possible
each day. For now have kept winds 20-30 kt each afternoon and
evening. Chb

Sew watches warnings advisories
Wa... None.

Pz... Gale warning until 5 am pdt Thursday for central u.S. Waters
strait of juan de fuca-east entrance u.S. Waters strait of
juan de fuca.

Small craft advisory until 3 am pdt Thursday for admiralty inlet-
northern inland waters including the san juan islands-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 27 mi51 min NNW 5.1 G 8 81°F 53°F1012.2 hPa (-1.5)
WPOW1 - West Point, WA 33 mi51 min NE 9.9 G 12 69°F 1012.6 hPa (-1.0)54°F
46120 34 mi48 min ESE 7.8 67°F 1012 hPa57°F
TCNW1 - 9446484 - Tacoma, WA 35 mi51 min 73°F 53°F1012.2 hPa (-1.2)
TCMW1 - 9446482 - Tacoma Met, WA 35 mi51 min W 8 G 8.9
46125 49 mi43 min 9.7 57°F 1012.3 hPa53°F

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 mi58 minNNW 610.00 miFair84°F57°F41%1012.2 hPa
Boeing Field - King County International Airport, WA24 mi58 minNW 610.00 miMostly Cloudy82°F53°F37%1011.9 hPa

Wind History from RNT (wind in knots)
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Last 24hrN4NW4N4CalmNW6CalmNW3CalmCalmCalmCalmCalmCalmN4N3N3N3N4N8NW8NW6NW5NW5N6
1 day agoSW4S5S8S5S7S6S6S6S8S5S6S4SE3SW4S3S44N5NW4NW4S74S4Calm
2 days agoNW10NW6NW6CalmNW3S4SE4CalmSE3S3SE3SE5SE3SE3SE3SE35SE54NW5N5NW4SW6Calm

Tide / Current Tables for Duwamish Waterway, Washington
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Duwamish Waterway
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Wed -- 01:32 AM PDT     Moonset
Wed -- 03:52 AM PDT     First Quarter
Wed -- 05:11 AM PDT     Sunrise
Wed -- 06:05 AM PDT     3.85 feet Low Tide
Wed -- 11:09 AM PDT     7.64 feet High Tide
Wed -- 01:27 PM PDT     Moonrise
Wed -- 05:18 PM PDT     1.82 feet Low Tide
Wed -- 09:10 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
11.910.99.37.35.54.33.94.156.27.27.67.46.65.43.92.61.92.13.257.29.411

Tide / Current Tables for Seattle, Washington
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Seattle
Click for Map
Wed -- 01:33 AM PDT     Moonset
Wed -- 03:52 AM PDT     First Quarter
Wed -- 05:11 AM PDT     Sunrise
Wed -- 05:54 AM PDT     4.06 feet Low Tide
Wed -- 11:08 AM PDT     7.88 feet High Tide
Wed -- 01:27 PM PDT     Moonrise
Wed -- 05:07 PM PDT     1.92 feet Low Tide
Wed -- 09:10 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
12.211.29.57.45.54.44.14.55.46.57.47.97.66.85.43.82.51.92.33.65.57.79.911.4

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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Wind Forecast for Seattle, WA (20,4,5,8)
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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.