Friday, April3, 2020
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Marine Weather and Tides
Polson, MT

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
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.

Sunrise 7:07AMSunset 8:12PM Friday April 3, 2020 5:30 PM MDT (23:30 UTC) Moonrise 1:30PMMoonset 4:17AM Illumination 83% Phase: Waxing Gibbous; Moon at 11 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 032038 AFDMSO

Area Forecast Discussion National Weather Service Missoula MT 238 PM MDT Fri Apr 3 2020

DISCUSSION.

Cold air aloft will remain over the Northern Rockies through Saturday. Vigorous snow showers that quickly drop visibility will continue to develop across the region through late this evening. Low elevation roadways are anticipated to be mostly unaffected by the snowfall, however roadways near mountain passes may become slick immediately after any snow shower passes. Snow activity is expected to diminish overnight, with most snow showers hugging terrain near the Continental Divide. Aside from a few inches of snow at high elevations, little or no snow accumulation is expected at lower elevations (including population centers). Temperatures will remain quite cool for early April.

A closed low pressure system moving south along the Pacific NW coast, will introduce a moist southwesterly flow over the Northern Rockies late Saturday evening, through Monday. This will promote another round of afternoon and evening rain/snow showers for the region. While most valley locations will see rain, the mountain passes are expected to experience quick burst of moderate snowfall. Under the heavier showers, the valleys may see snow mixing with the rain, however no accumulations are expected.

Conditions will begin to dry out during the day Tuesday, with Wednesday and Thursday being the driest and warmest days of the week. Temperatures during these two days are finally expected to warm back to normal, with some valleys seeing above normal temperatures.

Though the details remain uncertain, another active period is likely to move back over the Northern Rockies by late Friday, and continuing through next weekend. Long range forecast models are indicating another shot of cold air and moisture moving south out of Canada during this time, but confidence is murky on how far west and south it ultimately makes it. At least areas along the Continental Divide, may see a return of wintry conditions.

AVIATION.

Vigorous snow showers will continue to be present across the Northern Rockies air space through 04/0800Z, quickly reducing visibility and ceiling at times, as well as producing with gusts near 25 knots. KGPI and KMSO terminals are likely to be impacted by these snow showers for roughly 30 minutes per occurrence through 04/0300Z. Thereafter, most snow showers will be confined to high terrain near the Continental Divide. Terrain obscurations will be common through 04/0800Z, becoming more confined to near the Divide thereafter.

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 mi36 minWSW 16 G 2010.00 miA Few Clouds41°F16°F36%1011.4 hPa

Link to 5 minute data for KGPI

Wind History from GPI (wind in knots)
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Last 24hr----W3W3Calm--CalmCalmSW34NE5W3W3CalmCalmSW5SE15SE14SE14
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1 day agoN14N11NE13N16
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N14N13N10N12N9N11NE11NE7N543--S3
2 days ago--N10N13NE15N14N15
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N17N15
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N16N13N13

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 numerous 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.