Friday, December15, 2017 L-36.com


Marine Weather and Tides
Sandpoint, ID

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 7:27AMSunset 3:57PM Friday December 15, 2017 7:17 PM PST (03:17 UTC) Moonrise 5:45AMMoonset 3:47PM Illumination 5% Phase: Waning Crescent; Moon at 27 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 Sandpoint, ID
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location: 48.28, -116.54     debug


Area Discussion for - Spokane, WA
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Fxus66 kotx 160026
afdotx
area forecast discussion
national weather service spokane wa
426 pm pst Fri dec 15 2017

Synopsis
Snow will be focused over southeast washington and into the
southern and central idaho panhandle this evening and then
transition over to showers overnight. It will be drier for
Saturday before another weak weather system brings light snow on
Sunday. A windier and wetter system arrives next Tuesday into
Wednesday bringing the potential for heavy mountain snows and mix
of rain and snow in the lower elevations.

Discussion Updated...

radar is back filling back in toward the spokane
area. Large scale lift will still be generated as the upper level
trough swings through behind the mid level frontal passage. The
snow growth zone also will remain saturated into the early evening
hours. So, it does not appear as though we will see the snow
ending in the spokane area for at least another few hours. I have
extended the winter weather advisory for the spokane area and
coeur d'alene area through 8 pm. Expect the evening commute to be
impacted with snow accumulation on roadways. Drier air aloft will
move in late this evening with snow being focused over the
southeast portion of the region. Temperatures will cool down into
the mid to upper 20s overnight. Refreezing of moisture on the
roads will be possible with icy spots possible late tonight into
Saturday morning, especially on untreated roadways. Svh

Aviation
00z tafs: a front is making it's way through the southeast portion
of the forecast area late this afternoon. Light to moderate snow
will continue across the southeast zones through 08-09z affecting
kpuw klws with conditions mainly ifr lifr, behind the snow
southwest-west winds will keep the low stratus and fog in place
with little improvement until Saturday afternoon. Further north
radar returns are filling around kgeg-ksff-kcoe were kept in these
tafs through 04z. There may be a short break in the ifr lifr
cigs vsby after the snow ceases but southwest surface winds will
drop conditions back down through Saturday. Further to the west
the current ifr conditions at kmwh will deteriorate through the
evening with little if any improvement expected until Saturday
afternoon. Keat will likely remain MVFRVFR through the night.

Tobin

Prev discussion issued 233 pm pst Fri dec 15 2017
tonight: a mid level frontal band is pushing across the region
with the front located from southwest or to the northern id
panhandle at 2 pm. Frontal dynamics and moisture content was a bit
stronger than what we were expecting with snow accumulations
coming in a bit higher from around deer park to spokane and coeur
d'alene. We have been getting reports of total accumulations of
between 3 to 4 inches over these areas. The heavier snow will now
shift into the palouse, l-c valley and the southern to central id
panhandle. Expect similar snowfall totals from the late afternoon
into the evening for these areas. The l-c valley is expected to
have smaller snow ratios with temperatures starting out slightly
warmer and are expected to be closer to 2 inches with this event.

The frontal band will move southeast of the region this evening.

However, we will continue to get some large scale lift with the
upper level trough swinging through. Northwest flow will also
result in favorable upslope flow into the southern to central id
panhandle. So the winter weather advisories across the southeast
portion of the area remain on track and no changes will be made.

We will cancel the advisories for the moses lake area and upper
columbia basin with the precip now moving out of these areas. Snow
is expected to hang around the spokane area to the coeur d'alene
area for another hour or two. We will let those highlights run
their course and anticipate being able to take them down at 4 pm.

Svh
Saturday through Monday: snow showers over the blue mountains,
camas prairie, and central panhandle mountain Saturday morning
will given to region-wide drying. Areas of fog will remain an
issue to travel across the columbia basin, otherwise Saturday is
shaping up to be a benign weather day. A warm front will spread
light snow into the cascades Saturday evening which will continue
to expand east into the remainder of ERN wa and N id overnight
into Sunday. 1-3 inches of snow will be possible across NE wa and
n id while less than an inch is expected for the columbia basin
the with and around an inch or less for the columbia basin.

Heavier amounts will fall along the cascade crest and lookout pass
impacting travel across the passes. Warmer air does accompany the
Sunday warm front bringing the possibility for a brief mix or
switch to rain near the end of the precipitation for locations
south of i-90. A weak cold front will press through by Monday
morning swinging midlevel winds to the west northwest. This will
help shut off precipitation in the lee of the cascades and western
basin but continue for orographically favored areas such as the
cascade crest and idaho panhandle, at times expanding into the
eastern third of wa.

Monday night through Wednesday: a shortwave dropping out of the
gulf of ak will swing into the region. The wave will interact
with a baroclinic region leading to deep cyclogenesis off the
coast with an increasing confidence for the cyclone to remain
strong on its track inland. Preliminary model data indicates
somewhere in the range of 999-1006mb. The track of the low remains
near the wa bc border Monday night into Tuesday before sagging to
the southeast Tuesday night into Wednesday. The track has not
wavered much but trends were a slight shift southward.

Nonetheless, the current track suggest most lowlands south of hwy
20 will have a potential for rain until Tuesday night when the low
reaches N idaho and colder air wraps into the system. Current
guidance also suggest moderate to heavy mountain snow
accumulations across the north (north of i-90) through Tuesday
evening accompanied by wide range in lowland accumulation,
depending highly on when the switch back to snow occurs.

Wednesday night through Friday: high pressure amplifies off the
coast leaving the inland NW under a dry and colder northerly flow
regime. This is well agreed upon through the weekend then we begin
to see some model differences in regards to if the ridge builds
inland or remains off the coast. It looks like a dry weather
pattern with increased odds for near to below normal temperatures.

Smaller, compact systems digging down the eastern flank of the
ridge will keep a chance for snow showers at times along the id mt
border. Sb

Preliminary point temps pops
Spokane 25 30 24 33 31 37 100 0 10 50 40 20
coeur d'alene 26 30 24 34 31 38 100 30 20 60 70 40
pullman 26 30 24 34 33 39 100 40 10 40 60 30
lewiston 30 36 26 37 35 44 90 20 0 30 50 40
colville 26 33 26 31 28 36 30 0 20 50 30 20
sandpoint 26 32 24 32 30 37 80 20 20 70 70 40
kellogg 25 28 20 31 29 35 100 50 10 50 80 60
moses lake 26 35 27 35 29 39 40 0 10 20 20 10
wenatchee 29 37 28 32 30 38 20 0 20 30 30 20
omak 25 34 27 32 28 35 10 0 20 40 30 30

Otx watches warnings advisories
Id... Winter weather advisory until 4 am pst Saturday for central
panhandle mountains-idaho palouse-lewiston area.

Winter weather advisory until 7 am pst Saturday for lewis and
southern nez perce counties.

Winter weather advisory until 8 pm pst this evening for coeur
d'alene area.

Wa... Winter weather advisory until 4 am pst Saturday for lower
garfield and asotin counties-washington palouse.

Winter weather advisory until 8 pm pst this evening for spokane
area.



Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Sandpoint, Sandpoint Airport, ID2 mi42 minSW 410.00 miOvercast30°F26°F86%1018.6 hPa

Wind History from SZT (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmCalmSW3W5SW4SW5SW6SW7CalmS4SW4SW7S7S7SW7S3SW7S6Calm
1 day agoCalmCalmCalmCalmCalmNE4N6NE5N8N7NE7NE6NE7NE7NE7NE8NE6NE4CalmN5N3CalmNE4NE3
2 days agoCalmCalmCalmCalmCalmCalmCalmW3CalmCalmCalmCalmCalmCalmCalmE3CalmS4CalmCalmCalmNE3CalmCalm

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
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IR Satellite Image from GEOS
west_satellite

GOES Local Image of PacificNorthwest    EDIT
Geos

Wind Forecast for Spokane, WA (22,6,7,8)
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Ground Weather Radar Station Spokane, 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.