Saturday, April29, 2017 L-36.com


Marine Weather and Tides
Snoqualmie, WA

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 5:50AMSunset 8:20PM Saturday April 29, 2017 4:31 AM PDT (11:31 UTC) Moonrise 7:44AMMoonset 11:16PM Illumination 12% Phase: Waxing Crescent; Moon at 3 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 Am Pdt Sat Apr 29 2017
Today..S wind 5 to 15 kt. Wind waves 2 ft or less. A slight chance of rain in the afternoon.
Tonight..S wind 10 to 20 kt...becoming sw during the evening. Wind waves 1 to 3 ft. Rain likely in the evening then a chance of showers after midnight.
Sun..SW wind 5 to 15 kt. Wind waves 2 ft or less. A chance of showers.
Sun night..NW wind 10 to 15 kt. Wind waves 1 to 2 ft.
Mon..S wind to 10 kt becoming variable in the afternoon. Wind waves 1 ft or less.
Mon night..N wind to 10 kt becoming ne after midnight. Wind waves 1 ft or less.
Tue..Light wind becoming sw to 10 kt. Wind waves 1 ft or less.
Wed..S wind to 10 kt becoming nw. Wind waves 1 ft or less.
PZZ100 300 Am Pdt Sat Apr 29 2017
Synopsis for the northern and central washington coastal and inland waters..A front will bring increasing southerly winds to the coastal waters today and to the inland waters this evening. Westerly onshore winds will develop behind the front tonight...strongest in the central and eastern strait. Onshore flow Sunday will become generally light Monday through Wednesday.

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 291018
afdsew
area forecast discussion
national weather service seattle wa
320 am pdt Sat apr 29 2017

Synopsis An exiting upper level ridge will keep this morning dry
but a weak front will spread inland starting late this morning to
bring light rain to the area once more. Showers will linger Sunday
and possibly into Monday. Upper level ridging returns late Monday
and stretches out into Thursday bringing drier conditions and warmer
temperatures.

Short term Current radar and satellite are pretty quiet this
early morning. While skies are not completely clear... They have
cleared enough to provide a cool start to this morning with many
locations reporting temps in the upper 30s to lower 40s... Although
portions of whatcom and skagit counties... Retaining a bit of cloud
cover... Are proving warmer with temps in the mid to upper 40s.

Upper level ridging will cross the state today as a frontal system
rides hot on its heels. Far northwestern portion of the CWA may
start to see precip just before noon today... But most locations
likely will not see precip until mid or late afternoon and
continuing into late tonight. The front looks to get hung up over
the cascades by Sunday morning... Deteriorating as time
progresses... But that looks to be enough to keep some precip in the
forecast for most of the day Sunday... Although pops will not be
terribly impressive... Mostly in the chance range. Models agree on
both an upper level ridge building in over the area Monday as well
as some form of showers being in place but with high pressure both
at the surface and at the upper levels... Well... Find it difficult to
see where such precip would come from. Still... Kept low end chance
pops in the forecast but if models remain consistent in these
features... Would not be afraid to bet on dry conditions.

Temperatures in the near term generally remaining steady although
sadly remaining below normal with interior locations generally
seeing afternoon highs in the mid to upper 50s while coastal
locations will remain in the lower to mid 50s. Smr

Long term It has been a rare thing this spring to be able to
chain together more than one dry day... But the ridge for late Monday
through early Thursday morning just might be a chance for doing so.

Before completely grasping onto that optimistic
solution... However... It must be pointed out that a system does pass
just to the north of the CWA in this time span on Wed morning. The
gfs has it just nicking the very northernmost portions of the cwa
while the ECMWF remains true to form and offers a wetter solution.

While it may end up being a gambler's fallacy... Currently siding
with GFS solution for no better argument than W wa's luck has to
change sometime. Plus... Cannot turn away from the prospect of
afternoon high temperatures getting close to 70 on wed. Late
Thursday morning shows an upper level ridge passing through b.C.

Which may allow for precip for the northern half of the CWA into
Thursday evening before ridging over the pacific allows for
conditions over W wa to dry once more for Friday. The
ecmwf... However... Shows a fairly deep trough over the western us at
this time... So... As has been the case for at least the past couple
of weeks... Long term models remain generally uncertain and as such
lowering any degree of confidence in the extended forecast. Smr

Aviation High pressure will shift east this morning, then trough
approaching the region this afternoon will move through the area
this evening. Light to moderate southwesterly flow aloft becoming
westerly this evening behind the surface front. The air mass is
mostly dry and stable today. LowerVFR stratus and light rain will
at the coast this afternoon... Spreading inland by late afternoon or
early evening. A transition to showers should occur by midnight,
then decrease overnight.

Ksea... Southerly wind 4 to 6 kt rising to 10 to 12 knots after
18z... Then breezy southwest winds 13-16 kt w/ gusts to 25 knots
along and behind the front this evening. The front is expected to
pass the terminal around 06z this evening.

Marine Generally light flow this morning ahead of an approaching
front. Small craft winds will develop over the coastal waters later
this morning and strengthen up to 30 kt this afternoon. A switch to
westerly is expected by late afternoon, gradually easing through
midnight. A westerly push of small craft winds are likely to develop
behind the front in the central/eastern strait later this evening
through early Sunday morning. Winds over waters adjacent to the
eastern strait could reach near-small craft strength during this
period.

Onshore flow will weaken Sunday into early next week with a lull in
wind across the area through at least Tuesday and possibly
Wednesday. The next front may reach the waters by Thursday but
timing is highly uncertain. Dtm

Sew watches/warnings/advisories
Wa... None.

Pz... Small craft advisory coastal waters from 8 am pdt through 11 pm
this evening.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
EBSW1 - 9447130 - Seattle, WA 27 mi43 min ESE 4.1 G 6 49°F 48°F1026.4 hPa
WPOW1 - West Point, WA 33 mi31 min ESE 1.9 G 2.9 47°F 1026.3 hPa (-0.3)42°F
TCMW1 - 9446482 - Tacoma Met, WA 35 mi43 min E 1.9 G 2.9
TCNW1 - 9446484 - Tacoma, WA 35 mi49 min 46°F 49°F1026.7 hPa

Wind History for Seattle, Puget Sound, WA, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Renton, Renton Municipal Airport, WA20 mi38 minN 010.00 miOvercast45°F39°F83%1026.8 hPa
Seattle, Seattle Boeing Field, WA24 mi38 minESE 510.00 miMostly Cloudy47°F42°F83%1026.3 hPa

Wind History from RNT (wind in knots)
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Last 24hrS3CalmSE4SE4SE4S3S4NW5N5CalmN4NW4NW4N4CalmNW4CalmCalmCalmCalmCalmCalmS3Calm
1 day agoSE6S8S6S7SE9SE7S7S663W3NW73N3N5CalmNW84CalmCalmCalmS4S4S4
2 days agoS6S7S10S8
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Tide / Current Tables for Duwamish Waterway, Washington
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Duwamish Waterway
Click for Map
Sat -- 01:45 AM PDT     4.95 feet Low Tide
Sat -- 05:55 AM PDT     Sunrise
Sat -- 06:54 AM PDT     10.93 feet High Tide
Sat -- 08:46 AM PDT     Moonrise
Sat -- 02:03 PM PDT     -2.13 feet Low Tide
Sat -- 08:18 PM PDT     Sunset
Sat -- 09:03 PM PDT     11.61 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
6.55.355.87.49.110.510.910.38.66.23.40.7-1.3-2.1-1.40.63.56.59.21111.611.210

Tide / Current Tables for Seattle, Washington
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Seattle
Click for Map
Sat -- 01:34 AM PDT     5.21 feet Low Tide
Sat -- 05:54 AM PDT     Sunrise
Sat -- 06:53 AM PDT     11.26 feet High Tide
Sat -- 08:46 AM PDT     Moonrise
Sat -- 01:52 PM PDT     -2.25 feet Low Tide
Sat -- 08:19 PM PDT     Sunset
Sat -- 09:02 PM PDT     11.97 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
6.65.45.36.37.89.510.811.310.58.76.13.20.4-1.6-2.2-1.30.93.979.611.41211.510.3

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 (7,2,3,4)
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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.