Monday, December9, 2019
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Marine Weather and Tides
Polson, MT

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 8:13AMSunset 4:45PM Monday December 9, 2019 5:00 PM MST (00:00 UTC) Moonrise 3:36PMMoonset 5:14AM Illumination 96% Phase: Waxing Gibbous; Moon at 13 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 Polson, MT
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location: 47.7, -114.16     debug


Area Discussion for - Missoula, MT
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FXUS65 KMSO 092121 AFDMSO

Area Forecast Discussion National Weather Service Missoula MT 221 PM MST Mon Dec 9 2019

DISCUSSION. Northwesterly flow will persist over the Northern Rockies through tonight into Tuesday. A subtle feature is currently making its way through the region which could allow for the development of light snow showers over the higher terrain, especially around Glacier National Park.

A more substantial disturbance will trek across the Northern Rockies Tuesday night into Wednesday morning. This feature will bring some snow accumulations to the the region, especially to areas along the Montana/Idaho border. Lookout and Lolo passes have the potential to receive up to an inch or two of snow by late Wednesday morning.

A plume of atmospheric moisture will bring heavy snowfall across the higher terrain Thursday through Friday morning. Snow will begin early Thursday morning and peak in intensity during the afternoon and evening. A foot or more of snowfall is possible at Lookout and Lolo Passes by Friday morning. A wintry mix of precipitation is likely Thursday morning across valley locations. Areas along Highway 200 from Thompson Falls to Heron and U.S. Highway 2 from Kalispell to Troy will likely start out as snow early Thursday morning before transitioning to a mix of rain and freezing rain as warmer air slowly works into the area Thursday afternoon. Before precipitation switches over to rain, several inches of snow could fall across this area. A wintry mix of precipitation is also possible across the Flathead, Mission, Seeley-Swan, Missoula, and Bitterroot valleys early Thursday morning before temperatures warm above freezing. Lesser precipitation amounts are expected across these areas before precipitation changes over to rain as snow levels climb to 4,000 feet Thursday afternoon.

Another weather disturbance embedded within moist northwesterly flow will bring the possibility of snow across the entire area Friday afternoon into Saturday. A broad area of low pressure will track across eastern Washington into western Montana. A band of snowfall will develop on the north and west side of the low. Valley snowfall accumulations remain highly uncertain due their on dependency on exact track of the low; however, modest confidence exists for another period of heavy mountain snowfall across the Clearwater and Bitterroot mountains, with impacts to Lookout, Lolo, and Lost Trail Passes.

A drying trend is expected Sunday into Monday. Isolated snow showers will continue across the mountains as northwesterly flow continues.

AVIATION. Mid level stratus deck will continue to hover over western Montana through tonight into Tuesday with KGPI and KMSO being covered the majority of the time. This stratus could extend over KBTM or KSMN. A subtle upper level feature is moving over the Northern Rockies this afternoon and evening. This feature has the potential of causing very light snow in the higher terrain, especially around Glacier Park. At this time, snow showers are not anticipated to impact any of the terminals.

MSO WATCHES/WARNINGS/ADVISORIES. MT . None. ID . None.


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kalispell, Glacier Park International Airport, MT42 mi65 minN 010.00 miOvercast32°F26°F79%1024.4 hPa

Link to 5 minute data for KGPI

Wind History from GPI (wind in knots)
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Last 24hrN7N7N3N3CalmCalmCalmCalm--N3CalmCalmCalmCalmCalmCalmCalmCalmCalmNW3CalmCalmCalmCalm
1 day agoSW6CalmSW3W3SW4SW3CalmS6SW6S4SW4CalmW3SW4N3CalmN4NE15
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2 days agoW4CalmCalmCalmSW3CalmCalmW4CalmCalmCalmN3W3CalmCalmCalmCalmE3W3SW5SW4W3CalmW4

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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wmap_P
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 Missoula, MT (19,4,5,8)
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Ground Weather Radar Station Missoula, MT
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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.