Wednesday, January22, 2020
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Marine Weather and Tides
Turtle Lake, 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 8:15AMSunset 5:22PM Wednesday January 22, 2020 1:52 AM MST (08:52 UTC) Moonrise 6:43AMMoonset 3:17PM 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 Turtle Lake, MT
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location: 47.7, -114.1     debug


Area Discussion for - Missoula, MT
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FXUS65 KMSO 212131 AFDMSO

Area Forecast Discussion National Weather Service Missoula MT 231 PM MST Tue Jan 21 2020

DISCUSSION. A vigorous upper level weather disturbance, presently passing over Washington, will move over Idaho and Montana this evening. There's not a lot of moisture and there is meager instability, but nevertheless a round of light valley rain and mountain snow is expected tonight. Valley amounts of precipitation will be generally light and shouldn't amount to much more than enough to wet the ground. However, the mountains will likely see 2 to 4 inches of fresh snowfall with the higher peaks of the Bitterroots, Flathead, Swan and Mission Mountains receiving upwards of 10 to 14 inches of beneficial snowfall. These specific ranges will likely see some upslope enhanced precipitation and could see periods of heavy snowfall overnight.

Showers are likely to linger about the terrain on Wednesday as the region sits between weather systems. But this will be a temporary reprieve as models begin to spread warm frontal precipitation into Idaho and Montana by Wednesday evening. Yet again most Montana valley locations will be largely skunked when it comes to rain or snow. However, the same will not be said for the lower elevations of North Central Idaho (Idaho & Clearwater County) along with the valleys near the Idaho/Montana border and in far NW Montana (Troy, Libby, Yaak). Here steady light rain and snow will persist Wednesday night through Thursday, decreasing a little in intensity Thursday night before increasing again early Friday morning. But with the snow level rising it seems that any new snow will generally be less than an inch with upwards of around a quarter to a third of an inch of rainfall seemingly possible.

Finally, it is also worth noting that some places outside the main precipitation area could see some very light freezing rain or drizzle. The chances are quite low, but the latest model data showing this possibility first across parts of NW Montana (including the northern Flathead Valley) early Thursday morning and then again along the Blackfoot River near Clearwater Junction to Lincoln, parts of the Pintlar Scenic Loop (MT-1) and maybe even in Lemhi County along the Salmon River from North Fork to near the Pahsimeroi Valley Friday morning.

Another weak shortwave trough will be moving over the Northern Rockies during the day on Friday. Temperatures are expected to be warm enough in the valleys for what precipitation does reach the ground to be light rain possibly mixed with a little snow. The mountains and mountain passes will continue to see snow with the snowpack building. In the evening and overnight hours temperatures will be lowering back to freezing or below for the valleys of western Montana and Lemhi County in Idaho. So what precipitation does continues to fall, will transition to light freezing rain/drizzle. Although only trace amounts are expected, isolated slick spots on area roadways will be possible.

A southwesterly flow will develop over the region for the rest of the weekend as another re-enforcing shot of moisture moves in. This flow pattern will allow temperatures in the valleys to continue to run a few degrees above normal for this time of the year. In return, the valleys will continue to see mostly light rain, with periods of light snow mixed in. Again, light freezing rain in the valleys will be possible in the overnight hours.

For the snow lovers, a colder airmass looks to be moving in for the start of next week, giving the valleys a chance for seeing accumulating snow. Stay tuned!

AVIATION. A rather vigorous cold front will work its way across Idaho and Montana this evening resulting in some minor reductions to visibility and lowered ceiling heights due to light snow. Accumulation potential at KMSO, KGPI and KSMN is minimal. But an area of heavier showers is forecast to be stronger across SW Montana and may result in more prolonged reductions in airfield conditions. Some showers may linger in the vicinity of the TAF sites which should produce some periodically obscured terrain through Thursday morning. But overall the impact to aviation interests throughout the area will occur between 00z and 06z this evening.

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 mi58 minSSE 610.00 miOvercast35°F27°F72%1013.1 hPa

Link to 5 minute data for KGPI

Wind History from GPI (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmSW4CalmN3CalmCalmCalmCalmCalmCalmSE3CalmCalmSE3W3SE11S9S7S6
1 day ago3W3CalmCalmCalmCalmCalmSE4CalmCalmCalmSW4CalmCalmCalmCalmCalmCalmCalmN3CalmCalmCalmCalm
2 days agoCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmW3CalmCalmCalmCalmCalmN5

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 Missoula, MT (3,6,7,8)
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Ground Weather Radar Station Missoula, MT
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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 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.