Monday, December16, 2019
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Marine Weather and Tides
Spokane Valley, WA

Version 3.4
NOTICE
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:29AMSunset 3:59PM Monday December 16, 2019 5:13 AM PST (13:13 UTC) Moonrise 10:05PMMoonset 12:14PM Illumination 77% Phase: Waning Gibbous; Moon at 19 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 161142 AFDOTX

Area Forecast Discussion National Weather Service Spokane WA 342 AM PST Mon Dec 16 2019

SYNOPSIS. Monday and Tuesday will be dry and cool with areas of fog. A return to unsettled weather looks likely by Wednesday night into Friday, which may cause significant impacts to travel, especially over the passes.


DISCUSSION.

Today and tomorrow: A majority of the snow will be out of the region this morning. However, it's looking like we may still have some scattered precipitation hanging around in the Idaho Panhandle, and possibly the Spokane/Coeur d'Alene corridor, until the afternoon. Very little, if any accumulations, are expected. The remainder of the first half of the week will remain dry and cool in the Inland Northwest. Temperature variance will be small and possibly less than forecasted due to cloud coverage and if we have any stratus clearing. Areas of patchy fog will be our main concern for much of the region, especially the Columbia Basin and valleys, bringing lower ceilings and possible freezing fog this morning. On Tuesday, boundary layer winds out of the southeast will bring drier air into the Palouse and Columbia Basin. Patchy fog will return overnight today into tomorrow morning. However, with this drier air, most of the patchy fog will be limited to the eastern Cascades and northern Washington valleys. With the low, below freezing overnight values, freezing fog may occur again tomorrow morning. JS

Wednesday through Sunday:

. Heavy mountain snow with significant travel impacts possible .

Pattern is still fairly consistent in advertising a splitting negatively tilted trof passage with a warm southwest trajectory of approach. Pops and QPF are relative minor initially with this first disturbance passage with the higher amounts over the more orographically favored areas going through Wednesday. Wednesday night and Thursday remain wetter/snowier parts of forecast as frontal boundaries tied into the subtropical moisture plume sagging into the region move through. The wintry mix of precipitation pushed thru the area will start out as snow with a transition in the valleys to rain coupled with potential for some freezing rain in the lowlands near the East Slopes of all the way east into portions of the Columbia Basin late Thursday into Thursday night. Snowfall rates above 3500 feet Thursday night have potential to be quite high and result in substantial mountain snow accumulation. Friday and Friday night the jet stream becomes more south to north oriented and pushes additional boundaries through as warm fronts allowing for snow levels to show considerable rise, to near 4000 feet MSL and in some cases near 5000 feet MSL allowing for precipitation type to change to mostly rainfall in lowlands and valleys and even at lodge and base level for many mountain locations. Additional splitting of the moisture stream running parallel to the south to north oriented jet is likely so pops show an ever so slight decrease for the remainder of the weekend but by no means would this portion of the forecast be considered dry at this point with perhaps the exception being some lowland locations between the lee of the Cascade Crest and North Idaho. Winds should be brisk/windy Friday due to mostly southerly component as warm frontal feature moves through allowing temperatures to peak Friday and Saturday. A slight cooling trend is suggested Sunday as the earlier mentioned splitting of the meridional flow could allow cooler conditionally unstable air to move in from the west/northwest. /Pelatti

AVIATION. 12Z TAFS: IFR and MVFR cigs are expected to continue at most TAF locations into the evening. PUW and LWS have the best chance of partially clearing today and back into VFR conditions by the afternoon. GEG-SFF-COE will see improving cigs in the afternoon but will remain cloudy. MWH and EAT will likely remain under IFR cigs. JS


PRELIMINARY POINT TEMPS/POPS. Spokane 34 22 35 24 37 28 / 20 0 0 10 10 60 Coeur d'Alene 35 23 37 25 37 29 / 20 0 0 10 10 60 Pullman 34 23 36 26 37 29 / 10 0 0 0 0 40 Lewiston 38 25 38 28 39 31 / 0 0 0 0 0 30 Colville 32 20 35 22 36 26 / 10 0 10 10 20 60 Sandpoint 33 23 35 24 35 28 / 20 0 0 10 20 70 Kellogg 32 23 36 25 37 29 / 20 0 0 10 10 60 Moses Lake 31 22 33 23 34 25 / 10 0 0 10 10 40 Wenatchee 30 25 31 24 31 25 / 0 0 10 10 30 60 Omak 29 25 32 24 32 26 / 10 0 10 10 10 50

OTX WATCHES/WARNINGS/ADVISORIES. ID . Dense Fog Advisory until 5 AM PST early this morning for Idaho Palouse.

WA . Dense Fog Advisory until 5 AM PST early this morning for Washington Palouse.




Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Spokane, Felts Field, WA7 mi80 minN 010.00 miOvercast30°F24°F79%1029.7 hPa
Spokane, Spokane International Airport, WA18 mi80 minSSE 310.00 miOvercast26°F21°F84%1029.6 hPa
Coeur d'Alene Airport - Pappy Boyington Field, ID22 mi77 minN 010.00 miOvercast27°F24°F89%1031.8 hPa
Fairchild Air Force Base, WA24 mi75 minN 010.00 miOvercast25°F24°F100%1029.7 hPa

Link to 5 minute data for KSFF

Wind History from SFF (wind in knots)
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Last 24hrCalmW4W3W5W6W4W4W4SW6SW4W3SW6SW8SW9S7S7SW8SW5S4CalmSW3CalmCalmCalm
1 day agoW4W3CalmCalmCalmW4NW3W3W4W6CalmSW4CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalm
2 days agoSW4S4S4S4SW4SW3SW4W5S5CalmCalmN3CalmCalmCalmCalmCalmCalmCalmCalmCalmW3SW4W4

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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GEOS 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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Spokane, WA (8,2,3,4)
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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 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.