Friday, December15, 2017

Marine Weather and Tides
Spokane Valley, WA

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 7:29AMSunset 3:59PM Friday December 15, 2017 6:00 AM PST (14:00 UTC) Moonrise 5:46AMMoonset 3:51PM Illumination 8% 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 Spokane Valley, WA
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location: 47.64, -117.19     debug

Area Discussion for - Spokane, WA
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Fxus66 kotx 151055
area forecast discussion
national weather service spokane wa
255 am pst Fri dec 15 2017

Snow will spread over much of the inland northwest today. The
heaviest accumulations will be over southeast washington and the
southern idaho panhandle. It will be drier for Saturday before
another weak weather system brings light snow on Sunday. A
stronger and wetter system arrives next Tuesday into Wednesday.

Today through Saturday night: localized light snow falling from
the low clouds this morning, most notably over the west plains of
spokane. Pavement was already cold so this dusting of snow
shouldn't impact roads much. The main frontal band of snow is
currently over NW washington at 2:30am. It will move into the
cascades by sunrise. At 10am, the band should extend from
sandpoint to ellensburg. This should mean a start time in the
spokane metro area just before noon. By this time, road pavement
temperatures will probably around 35f, so initially the snow will
melt on the roads. But if it snows hard enough, there will be
road accumulations. North of highway 2 it should be cold enough
for the roads to accumulate snow.

A mixed bag of precipitation types (snow, sleet, freezing rain) is
possible from wenatchee to moses lake and southward, mainly this
morning and early afternoon. This could lead to slick roads and
side walks but won't be enough ice to cause tree or power line

The front will slowly exit over southeast wa and the southern
panhandle tonight. This is the favored area for snow accumulations
with this flow pattern. As such, winter weather advisories have
been issued for the palouse, central panhandle, l-c valley, and
the camas prairie. Saturday should be dry but cold and cloudy. Rj
Sunday through Thursday: active weather pattern continues. The ridge
is rather flattened and easily over-topped by disturbances
running over it and pushing moisture through it Sunday through
Tuesday morning. With this in mind pops will still paint a good
possibility of valley rain and mountain snow with a rain shadow
expanding in the lee of the cascades into the columbia basin and
points further east at times Sunday through Tuesday morning.

Models depict a shortwave digging on the back of a baroclinic band
with moderate amounts of precipitable water running through it
Tuesday and pass the resulting low pressure system aid its
associated frontal features through eastern washington and
northern idaho in the Tuesday Wednesday time interval. This is
followed up with ridge axis positioning well off the coast
allowing for a cold northerly flow Thursday which appears void of
significant shortwaves in the latest models. As far as how this
plays out with temperatures it should allow for a warming trend
maxing out on Tuesday as the low pressure system works through
followed by a cooling trend brought about by the northerly flow
that follows after. Winds could be breezy Tuesday due to the low
pressure systems surface low positioning in southern british
columbia bringing about a tight south to north pressure gradient
followed by a shift to breezy southwest winds Wednesday when the
back edge of the same low pressure system passes through. Pelatti

12z tafs: stratus and fog in the lower elevations will be overrun
by a frontal system today. The front will be aligned from
sandpoint to ellensburg by 18z, and exiting the southern panhandle
overnight. Keat and kmwh could see a mixed-bag of precipitation
types. For the remainder of the tafs it should be just snow with
ifr conditions this afternoon and evening. Rj

Preliminary point temps pops
Spokane 32 25 30 25 34 31 100 10 0 20 40 40
coeur d'alene 33 27 30 23 34 31 100 20 30 20 60 70
pullman 32 27 30 23 34 32 100 60 40 10 30 70
lewiston 35 30 36 25 38 35 80 80 20 10 20 50
colville 33 23 33 26 32 29 40 10 0 30 40 30
sandpoint 32 27 32 24 33 30 80 40 20 20 60 80
kellogg 31 25 28 21 31 29 100 80 50 10 50 90
moses lake 31 27 35 27 36 30 40 0 0 10 20 10
wenatchee 35 30 37 28 35 30 20 0 0 20 30 20
omak 33 26 34 27 32 28 10 0 0 30 30 20

Otx watches warnings advisories
Id... Air stagnation advisory until 10 am pst this morning for central
panhandle mountains-coeur d'alene area-idaho palouse-lewis
and southern nez perce counties-lewiston area-northern

Winter weather advisory from 1 pm this afternoon to 4 am pst
Saturday for central panhandle mountains-idaho palouse-
lewiston area.

Winter weather advisory from 1 pm this afternoon to 7 am pst
Saturday for lewis and southern nez perce counties.

Wa... Air stagnation advisory until 10 am pst this morning for east
slopes northern cascades-lower garfield and asotin counties-
moses lake area-northeast blue mountains-northeast
mountains-okanogan highlands-okanogan valley-spokane area-
upper columbia basin-washington palouse-waterville plateau-
wenatchee area.

Winter weather advisory from 1 pm this afternoon to 4 am pst
Saturday for lower garfield and asotin counties-washington

Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Spokane, Felts Field, WA7 mi67 minN 04.00 miFog/Mist31°F28°F92%1024.8 hPa
Spokane, Spokane International Airport, WA18 mi67 minS 77.00 miLight Snow29°F28°F96%1024.1 hPa
Coeur d'Alene Airport - Pappy Boyington Field, ID22 mi64 minS 810.00 miOvercast30°F27°F88%1026.4 hPa
Fairchild Air Force Base, WA24 mi61 minSSW 51.50 miLight Snow Fog/Mist28°F27°F100%1024.6 hPa

Wind History from SFF (wind in knots)
Last 24hrCalmCalmNW5CalmCalmCalmCalmNW3N3E3W3CalmCalmCalmCalmS4W3SW4CalmS4CalmCalmCalmSW3
1 day ago3CalmCalmCalmW3CalmCalmCalmCalmCalmCalmN4CalmCalmCalmN3CalmCalmCalmCalmCalmCalmCalmCalm
2 days agoW3W4W4W4NW3W433W3CalmNE3N3N5N4N4N4N3NW4N3NW4CalmN4SE4Calm

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 (9,2,3,4)
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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.