Thursday, September21, 2017 L-36.com


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 6:32AMSunset 6:46PM Thursday September 21, 2017 12:34 PM PDT (19:34 UTC) Moonrise 7:57AMMoonset 7:47PM Illumination 1% Phase: Waxing Crescent; Moon at 1 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 211733
afdotx
area forecast discussion
national weather service spokane wa
1033 am pdt Thu sep 21 2017

Synopsis
A band of light showers will move from the northern mountains
into basin this morning, and then weaken to hit and miss showers
by afternoon with cool temperatures. Drier and warmer weather
starts Friday and persists into the weekend and possibly early
next week.

Discussion
Just made a few updates to the coverage of precipitation moving
through the spkane coeur d'alene area this morning and the mention
of fog in the columbia basin. More intense mountains showers early
this morning brought snow to below 5k ft, including sherman pass.

Today through Friday: the stubborn upper level trough continues to
influence the weather over the inland nw. Currently the main low
center is over the canadian prairies with it's trough axis
stretching back across WRN mt, SE wa into central oregon. Radar's
picking up on a few upslope showers over the central panhandle
under the light westerly flow, while the satellite fog product
shows a moist boundary layer and a low cloud deck from extreme
eastern wa into the idaho panhandle. Patchy fog with reduced
visibilities will be possible in sheltered spots in this areas.

Meanwhile an increasing northeast flow aloft is ushering moisture
and warming aloft. A weak disturbance on the leading edge of this
moisture band is responsible for light showers drifting from srn
bc across the okanogan valley into the northeast wa mountains.

These showers will gradually increase and press southward this
morning, spreading from the mountains toward i-90 before weakening
and becoming more convective as low level instability increases.

The instability doesn't look strong enough to support lightning
this afternoon, although isolated intense showers are still
possible along with snow down to near 5k ft. Winds will pick up
out of the north through the day with locally gusty winds
funneling down the okanogan valley for the afternoon and evening.

Scattered showers are expected to dissipate this evening, while
the mid level moisture remains with the northern flow aloft. The
upper trough pinches off into a closed low over or overnight and
slowly lifts across SRN id into SW mt. As it does moisture aloft
will thin over the region. Surface pressure gradients tighten
across the id mt border and north to northeast winds increase late
tonight into Friday morning with local gusts. This should help
keep the boundary drier late tonight, although sheltered valleys
across the central panhandle may be subject to a lingering cloud
deck. Temperatures will cool into the 30s overnight and some
patchy frost is possible in cold spots. Anticipate a drier dry for
Friday with a few mountain showers near the cascade crest and the
central panhandle mountains, while temperatures slowly begin their
slow warm up. Rfox.

Friday night through Thursday... No major changes to the extended
forecast. The upper level low will slowly move east of the area
Friday night and Saturday. Meanwhile a flat ridge of high pressure
will nose into the region. This pattern will set up a mainly dry
northerly flow over the inland northwest. A few showers will be
possible in the up-sloping flow along the idaho montana border
through Saturday afternoon, otherwise the forecast will remain
dry. Due to blocking across the eastern third of the country the
ridge axis will not move into central washington until Tuesday
night or Wednesday. Model guidance indicates that a couple of weak
short wave disturbances will try to sneak over the ridge and
provide the forcing necessary for isolated showers over the higher
terrain. This will also be a period with the temperatures slowly
warming as the ridge axis slides east of the cascades. It still
looks like temperatures in the 60s on Saturday will warm 2-3 each
day with high temperatures finally making it back to the lower to
mid 70s by Wednesday and Thursday, which is right at seasonal
highs for this time of the year. Tobin

Aviation
18z tafs: a band of moderate rain showers moistening the boundary
layer this morning around kgeg ksff kcoe with MVFR and localized
ifr conditions. With this band of showers decreasing combined with
daytime heating should see CIGS gradually rise into the afternoon.

May see some additional showers pop up this afternoon as instability
increases... But most of these will be over the mountains. These
showers will dissipate after sunset withVFR conditions favored for
all TAF sites tonight and Friday morning. Jw

Preliminary point temps pops
Spokane 53 39 60 41 62 42 30 10 0 10 10 10
coeur d'alene 52 36 59 37 62 38 30 10 0 10 10 10
pullman 55 34 59 39 60 39 10 10 10 10 10 10
lewiston 60 41 65 43 67 44 10 10 10 10 10 10
colville 57 38 65 38 67 38 20 10 10 10 10 10
sandpoint 51 34 59 34 60 35 30 20 10 10 10 10
kellogg 49 32 54 33 57 35 40 30 10 10 10 10
moses lake 62 41 69 41 70 43 10 10 0 10 0 10
wenatchee 61 45 68 46 70 48 10 10 0 10 0 10
omak 61 44 68 41 71 42 10 10 10 10 0 10

Otx watches warnings advisories
Id... None.

Wa... None.



Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boundary County Airport, ID30 mi60 minN 010.00 miOvercast45°F42°F93%1011.8 hPa

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Last 24hrS8SW7S7SW6S5SW9SW6S6S6SW6SW7SW3S3CalmCalmCalmCalmCalmCalmS3CalmCalmCalmCalm
1 day agoE6S3CalmS6SW6SW6S5S6S6CalmS3S3SE3CalmCalmCalmE3E4CalmS3CalmCalmSE4S7
2 days agoS7
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N9E3CalmCalmCalmNE3SE3CalmSE4SE4S4S4S4CalmSE3SE3E3Calm

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
wmap_P
IR Satellite Image from GEOS
west_satellite

GOES Local Image of PacificNorthwest    EDIT
Geos

Wind Forecast for Spokane, WA (15,3,4,5)
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Ground Weather Radar Station Spokane, 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.