Monday, January22, 2018

Marine Weather and Tides
Troy, MT

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 7:22AMSunset 4:35PM Monday January 22, 2018 6:10 PM PST (02:10 UTC) Moonrise 11:12AMMoonset 11:32PM Illumination 38% Phase: Waxing Crescent; Moon at 6 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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7 Day Forecast for Marine Location Near Troy, MT
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location: 48.36, -116     debug

Area Discussion for - Spokane, WA
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Fxus66 kotx 230012
area forecast discussion
national weather service spokane wa
412 pm pst Mon jan 22 2018

An active weather pattern is expected through the week. A wet and
mild weather system will bring significant precipitation Tuesday
into Wednesday and again next weekend with a mix of rain and snow
across the lower elevations and snow in the mountains. Travel
impacts are expected at times, especially over the mountain

Tonight through Thursday: a warm moist pacific system will move
into the region starting Tuesday morning. Snow levels will rise
during the day and overnight hours. Our forecasted low
temperatures Tue night Wed morning will be near what our high on
Tuesday was. Models have slowed down the timing a bit of the onset
of the precipitation Tuesday morning. Snow will spread across the
cascades by mid morning and into central wa by late morning. Snow
levels through the aftn will be about 1500-2000 ft for central wa
with snow expected in the okanogan valley. The precip will spread
east through the aftn into eastern wa and north id. Snow levels
will be a bit higher with only rain expected for the columbia
basin, palouse, spokane coeur d'alene, lc valley. Precip will
start off as snow in the northern wa and id valleys and then
transition to rain or a rain snow mix in the aftn and evening.

Wednesday snow levels will continue to rise with all valleys
seeing rain, except for the methow valley in the cascades which
will see continued snow. The trough will start to move inland wed
night with a cold front passing west to east through the overnight
hours. Thursday showers will continue across most of the region
under the unstable southwest flow.

*highlights: have decided to issue warnings across the mountains
of northern wa and the id panhandle. Will issue an advisory for
the okanogan valley as well. These will start Tuesday mid
morning-early aftn and will end Wed or Thursday depending on the
timing of the warmer air.

*impacts: heavy snow is expected across the mountains. Moderate
to heavy amounts are expected in the valleys. Generally along and
north of highway 20 will see heavier amounts of snow in the
valleys than areas to the south. Locations that see just rain
could see around a half an inch to around an inch with this
system. Rises on areas streams, creeks and rivers is expected,
especially across the palouse. Nisbet
Thursday night through Monday: a post frontal cold and conditionally
unstable airmass resides over eastern washington and northern idaho
Thursday night and Friday allowing for moderate pops for snow
showers (with a rain snow shower mix possible during the afternoon
and early evening hours) over the more orographically favored
mountains of north idaho, northeast washington, and within the close
proximity of the lee of the cascade crest. Over the weekend and into
the early portion of the next workweek there is potential for two
winter weather systems to move through the forecast area allowing
for higher rain snow amounts in comparison to that expected on
Thursday Friday. These passing weather systems will have well
maintained moisture taps feeding into them as well as warm
trajectories of approach along the west edge of a ridge of high
pressure with axis placement to the east and a large area of low
pressure well off the coast. This warm trajectory of approach
supports a generally warming trend with rises in snow levels
allowing for intervals of rain as high as 4000-5000 feet msl.


00z tafs: late this afternoon, our air mass has become well mixed
for late january with temp dewpoint spreads over 10 degrees across
much of central and eastern washington. Clouds almost have a
spring-like convective look to them. Low stratus will probably be
slow to develop tonight with only the favored upslope tafs of
kgeg, ksff, and kcoe having low clouds included overnight. Rain
and snow is expected to develop along the cascades in the morning
and spread across eastern wa through the day. Gkoch

Preliminary point temps pops
Spokane 29 36 35 39 29 35 0 80 100 90 80 20
coeur d'alene 29 36 35 38 29 35 10 70 100 90 80 30
pullman 31 37 36 44 31 37 10 70 100 90 70 20
lewiston 34 42 41 49 34 41 10 40 70 80 60 20
colville 27 34 33 37 28 35 0 100 90 80 90 30
sandpoint 28 35 34 36 28 34 40 90 100 90 80 50
kellogg 28 36 35 37 28 34 60 50 100 90 80 50
moses lake 30 37 36 46 29 40 0 100 90 50 40 10
wenatchee 29 34 33 38 26 35 0 100 90 50 40 20
omak 27 34 33 36 26 33 10 100 90 90 80 30

Otx watches warnings advisories
Id... Winter storm warning from 1 pm Tuesday to 4 am pst Thursday for
northern panhandle.

Winter storm warning from 4 pm Tuesday to 4 pm pst Wednesday
above 3500 feet for central panhandle mountains.

Wa... Winter storm warning from 1 pm Tuesday to 4 am pst Thursday for
northeast mountains-okanogan highlands.

Winter storm warning from 10 am Tuesday to 4 am pst Thursday for
east slopes northern cascades.

Winter weather advisory from 10 am Tuesday to 4 am pst Wednesday
for okanogan valley.

Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boundary County Airport, ID30 mi40 minSSW 410.00 miOvercast37°F28°F70%1021.3 hPa

Wind History from 65S (wind in knots)
Last 24hrSW4CalmS5S4CalmSW3S5S3SE3S4CalmCalmCalmCalmSW4CalmCalmCalmS4S7S6SW5S5S3
1 day agoSW6S5CalmCalmCalmCalmCalmCalmCalmCalmCalmS4CalmE3E4CalmCalmCalmCalmCalmCalmCalmCalmCalm
2 days agoSW4SW5SW7SW5SW3S4CalmSW3CalmCalmCalmCalmCalmCalmCalmCalmSW5SW6S6SW6SW8SW6SW4S4

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map and Satellite Images
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Weather Map
IR Satellite Image from GEOS

GOES Local Image of PacificNorthwest    EDIT

Wind Forecast for Spokane, WA (21,6,7,8)
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Ground Weather Radar Station Spokane, WA
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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 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 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.