Monday, April19, 2021
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Marine Weather and Tides
Polson, MT

Version 3.4
NOTICE
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:36AMSunset 8:35PM Monday April 19, 2021 4:15 PM MDT (22:15 UTC) Moonrise 10:26AMMoonset 2:14AM Illumination 55% Phase: First Quarter Moon; Moon at 8 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 192044 AFDMSO

Area Forecast Discussion National Weather Service Missoula MT 244 PM MDT Mon Apr 19 2021

DISCUSSION. What an impressive cold front for mid-April yesterday! Snow amounts ranged from several inches along the Continental Divide including 4.5 inches just south of Butte, to a whopping 9 inches in Hamilton. Strong winds caused damage and a few power outages across portions of northwest Montana, especially between Heron and Thompson Falls. A few trees also went down between Big Mountain and Whitefish Lake and also at Lake Blaine.

Temperatures were struggling to warm much this afternoon across the region and an easterly wind gradient made it feel even cooler. Expect clearing skies tonight and temperatures will fall into the teens and 20s across western Montana and potentially down to the single digits for a few areas of southwest Montana. For those with sensitive plants in greenhouses, you may want to think about taking necessary measures to keep them warm. In Idaho, generally low temperatures in the 30s are expected for the lower elevations.

A moderating trend is expected Tuesday and Wednesday. Highs on Tuesday will continue to be below normal. With high pressure centered over eastern Montana, our area will continue to have a weak easterly wind gradient. These easterly breezes will likely be a little weaker as compared with today. Cold temperatures are again anticipated Wednesday morning thanks to the dry and cooler airmass in place.

Yet another unseasonably cold, polar airmass is expected to infiltrated the area on Thursday. The pieces that we have the highest confidence include the potential for snow along the Continental Divide and for mountain passes along the Idaho and Montana border. We also high confidence for gusty north to east winds occurring. Right now, there is risk for damaging winds, but confidence is low. Any recreation on area lakes, including Flathead Lake, could be negatively impacted by gusty winds Thursday afternoon through Friday morning. There is also another chance for snow in the valleys across western Montana Thursday night, but it is too early to tell where and how much.

There is also an isolated threat for an isolated thunderstorm or two across north-central Idaho and lesser confidence for storms over west- central Montana later Thursday.

A large-scale pattern change is possible by the weekend as the flow becomes more west to southwest. It appears unsettled with periodic Pacific systems with showers and temperatures will fluctuate near to below normal levels.


AVIATION. An easterly gradient will keep breezes going into this evening but most locations will see a decrease in winds overnight. Overall, the whole atmosphere will dry out causing mostly clear skies overnight. Shallow ground fog will be possible in a few valleys by Tuesday morning, especially those that experienced snow melt this afternoon but widespread frost seems more likely overall. Other than a few cloud buildups on the terrain, Tuesday will feature mostly clear skies with light winds.


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 mi21 minNE 610.00 miOvercast45°F15°F30%1029.9 hPa

Link to 5 minute data for KGPI

Wind History from GPI (wind in knots)
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Last 24hrN29
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1 day agoSE8S9S9S5CalmW5N3CalmCalmCalmCalmCalmCalmCalmCalmCalmN4NE11NE10NE8NE16NE24
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2 days agoNE5NE13NE10E6CalmCalmW3CalmCalmCalmCalmW4CalmW3CalmCalmN4E6NE44SE7S6SE45

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: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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