Sunday, February17, 2019 L-36.com


Marine Weather and Tides
Skykomish, WA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 7:01AMSunset 5:29PM Sunday February 17, 2019 6:06 PM PST (02:06 UTC) Moonrise 3:11PMMoonset 5:58AM Illumination 98% Phase: Waxing Gibbous; Moon at 13 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- 211 Pm Pst Sun Feb 17 2019
Tonight..N wind 10 to 20 kt becoming sw after midnight. Wind waves 1 to 3 ft.
Mon..S wind to 10 kt. Wind waves 1 ft or less.
Mon night..Variable wind to 10 kt becoming sw after midnight. Wind waves 1 ft or less.
Tue..SW wind 5 to 15 kt rising to 15 to 25 kt in the afternoon. Wind waves 2 ft or less building to 2 to 4 ft.
Tue night..SW wind 10 to 20 kt. Wind waves 1 to 3 ft.
Wed..NW wind 10 to 20 kt becoming N in the afternoon. Wind waves 1 to 3 ft.
Wed night..N wind 5 to 15 kt in the evening becoming light. Wind waves 2 ft or less.
Thu..Light wind becoming variable to 10 kt. Wind waves 1 ft or less.
Fri..S wind 10 to 20 kt becoming sw 15 to 25 kt. Wind waves 1 to 3 ft building to 2 to 4 ft.
PZZ100 211 Pm Pst Sun Feb 17 2019
Synopsis for the northern and central washington coastal and inland waters..A weak surface low along the oregon coast with high pressure over southern british columbia will result in northeasterly fraser outflow. Small craft advisory winds are now expected over the northern inland waters. A frontal system will reach the waters Tuesday resluting in increased winds and seas.


7 Day Forecast for Marine Location Near Skykomish, WA
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location: 47.78, -121.05     debug


Area Discussion for - Spokane, WA
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Fxus66 kotx 172347
afdotx
area forecast discussion
national weather service spokane wa
347 pm pst Sun feb 17 2019

Synopsis
Periods of light snow will decrease from the inland northwest
overnight. Gusty northerly winds blow will continue tonight with
localized blowing and drifting snow as cold temperatures and
bitter wind chills return. Expect cold and dry weather Monday,
then more snowy weather by Tuesday through Wednesday. Another
round is possible by the end of the week as cold temperatures
persist.

Discussion
Tonight... The main focus for tonight will be associated with
the incoming cold front and upper level shortwave disturbance
tracking through the washington palouse. These features will
continue to generate snow this evening as well as continuing to
generate cold winds coming down the okanogan valley and purcell
trench.

Snow: the latest radar imagery continues to show widespread light
snow stretching from davenport to deer park with a little bit
heavier snow over the palouse and southern spokane county. Most of
this precipitation will continue to drift south-southeast this
evening and overnight as the upper level shortwave tracks toward
the camas prairie. Over the past couple hours the expanse of the
snow shield has shrunk quite a bit as drier air spills in from the
north and northeast. Nonetheless we still could see snow amounts
nearing an inch over the southeast quarter of washington and into
nc idaho through the evening. Meanwhile heavier amounts will
likely occur over the camas prairie and blue mountains as the mid-
level flow turns nnw behind the passing cold front. This flow
regime coupled with a saturated and unstable dendritic layer will
spell the perfect ingredients for heavier snow activity. Looks
like the heavier activity will develop sometime after 7pm. Amounts
over the camas prairie could range from 2-4” but it would not
be surprising to see some totals near 6”. Slightly lighter
totals are expected over the blue mountains.

Winds and colder temps: as of 2 pm the colder air has pretty much
infiltrated most of the area with northerly winds now noted at
almost all sites save the extreme southern portions of the
columbia basin. The strongest winds remain over the usual
locations for arctic cold fronts, the okanogan valley waterville
plateau and the purcell trench. Both of these locations are seeing
wind gusts of 25-30 mph as of mid-afternoon, with lesser winds
being reported elsewhere. We suspect winds in those areas have
likely peaked but breezy conditions will remain a fixture at least
through the first half of the night with widespread 10-20 mph
winds across much of the columbia basin as well. Meanwhile
temperatures will plummet tonight, setting the stage for some
brisk wind chill values, mainly in the single digits. The good
news is by the time the coldest temperatures occur toward morning,
the winds should be significantly weaker. Blowing snow was
another concern we had, however we haven’t heard of significant
drifting (unlike the event last week) and with the wind and snow
threat likely waning this evening over the northern half of
washington and idaho we don’t expect it to be a big issue.

Monday... Finally we should see a quiet and snow free day as a
shortwave ridge builds in ahead of the next system. Despite the
drying, we are still looking at very chilly temperatures with
highs generally in the lower to middle 20s. These readings are
generally 15-20 degrees colder than what it should be for this
time of year. Fx

Light to moderate snow returns to southeast
washington and the southern half of the id panhandle late Tuesday
through Wednesday...

Monday night through Wednesday night: dry northerly flow Monday
night into Tuesday with a short break from the snow. As winds
decrease, very cold overnight temperatures are forecast by early
Tuesday morning with widespread single digits, even below zero
despite the presence of mid and high level clouds. The next weather
system drops down the b.C. Tuesday. Surface winds turn out of the
south with weak isentropic lift generating light snow across much
of eastern washington and north idaho. Precipitation chances
increase as a surface low over northwest washington tracks to
central oregon and will see winds turn out of the north. An upper
level trough elongates of the region as instability increases.

The models show the best QPF amounts spanning across southeast
washington into the southern half of the panhandle with the
potential of light to moderate snowfall with enhanced orographic
lift. Temperatures warm slightly Wednesday with a rain snow mix
possible in the lc valley, although snow would be experienced
elsewhere. Gusty winds develop in the okanogan valley and purcel
trench with speeds of 20 to 25 mph Wednesday afternoon and early
evening. Snow chances gradually decrease Wednesday afternoon and
evening as drier air moves in from the north. Rfox.

Another round of snow late Friday into the weekend...

Thursday through Sunday: Thursday into Thursday night looks to be
another dry and cold period with high pressure over the inland
northwest and light northerly winds. The next round of winter
weather arrives Friday as warm front spans across the northern
counties at least by Friday afternoon and evening with light snow.

Snow chances increase Friday night into Saturday as a surface low
tracks across southern b.C. And a cold front sweeps through the
region. With more of a westerly mid level flow, models suggest a
rain shadow spanning from the lee side valleys into the columbia
basin with the best QPF across the eastern third of washington
into north idaho. Again snow levels look to rise in the lc valley
with a rain snow mix, meanwhile the remaining areas should see
more snow. Confidence on the timing of this system is remains low
with the operational GFS being the faster of the models and the
ecmwf being a little sluggish. Nonetheless, it looks to be a
prolonged period of unsettled weather conditions through the
weekend. Rfox

Aviation
00z tafs: a shortwave trough will continue to sag south across
the region tonight, providing areas of MVFR ifr CIGS and some snow
showers before drier air comes in. Snow shower chances will linger
early this evening around geg sff coe and around puw lws through
much of the night. Smaller chances will be found around eat mwh.

As the drier air invades overnight into Monday and the
precipitation threat wanes, the clouds are expected to erode,
leading to improving condition. Winds will decline through the
evening too. Cote'

Preliminary point temps pops
Spokane 6 21 5 22 16 27 0 0 0 60 60 30
coeur d'alene 7 22 6 23 18 29 0 0 0 60 70 30
pullman 11 22 6 24 22 28 50 0 0 60 90 60
lewiston 19 27 12 30 27 35 70 0 0 20 80 60
colville 7 26 7 27 12 34 0 0 0 40 40 10
sandpoint 12 23 11 23 19 29 0 0 0 50 70 30
kellogg 7 22 7 24 18 30 30 0 0 40 80 70
moses lake 14 26 10 25 16 29 0 0 0 30 40 40
wenatchee 18 26 13 26 17 28 10 0 0 30 30 40
omak 14 26 11 23 17 29 10 0 0 40 40 20

Otx watches warnings advisories
Id... Winter weather advisory until 4 am pst Monday for lewis and
southern nez perce counties.

Wa... None.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WPOW1 - West Point, WA 74 mi67 min N 5.1 G 6 43°F 1024.1 hPa (+1.0)32°F
TCMW1 - 9446482 - Tacoma Met, WA 80 mi37 min W 5.1 G 7

Wind History for Seattle, Puget Sound, WA, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Stampede Pass, WA37 mi2.2 hrsVar 50.50 miFreezing Fog27°F23°F85%1020.5 hPa

Wind History from SMP (wind in knots)
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Last 24hr336654443W4SW434SW4344556W6555
1 day agoCalmCalmCalmCalmCalmCalmNE3333CalmCalmCalmCalmCalmCalmCalmCalmCalm4Calm443
2 days ago4544E44E35444E3CalmCalmCalmE4CalmE3CalmCalm5--CalmCalm

Tide / Current Tables for Marysville, Quilceda Creek, Washington
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Marysville
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Sun -- 04:09 AM PST     11.22 feet High Tide
Sun -- 06:02 AM PST     Moonset
Sun -- 07:11 AM PST     Sunrise
Sun -- 09:39 AM PST     6.50 feet Low Tide
Sun -- 02:06 PM PST     10.36 feet High Tide
Sun -- 03:15 PM PST     Moonrise
Sun -- 05:34 PM PST     Sunset
Sun -- 09:45 PM PST     -1.73 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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46.89.110.611.21110.18.77.56.76.67.38.59.710.4108.97.14.82.30.1-1.4-1.7-0.6

Tide / Current Tables for Everett, Washington
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Everett
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Sun -- 04:00 AM PST     11.57 feet High Tide
Sun -- 06:02 AM PST     Moonset
Sun -- 07:11 AM PST     Sunrise
Sun -- 09:09 AM PST     7.23 feet Low Tide
Sun -- 01:57 PM PST     10.69 feet High Tide
Sun -- 03:15 PM PST     Moonrise
Sun -- 05:34 PM PST     Sunset
Sun -- 09:15 PM PST     -1.92 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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57.79.811.111.611.210.28.97.77.27.58.39.410.310.710.28.76.641.3-0.8-1.9-1.50.1

Weather Map and Satellite Images
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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 Spokane, WA (21,6,7,8)
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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.