Tuesday, December10, 2019
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Marine Weather and Tides
Big Sky, 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 7:52AMSunset 4:41PM Tuesday December 10, 2019 4:26 AM MST (11:26 UTC) Moonrise 4:00PMMoonset 6:04AM Illumination 98% 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 Big Sky, MT
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location: 45.26, -111.31     debug


Area Discussion for - Great Falls, MT
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FXUS65 KTFX 100307 AFDTFX

Area Forecast Discussion National Weather Service Great Falls MT Issued by National Weather Service Glasgow MT 807 PM MST Mon Dec 9 2019

Evening update . Main change was to trim back on the precip (snow) in the east, based on radar trends and obs.

Otherwise, minor updates to winds and cloud cover.

Avery

SYNOPSIS.

Slightly warmer, yet still below normal, temperatures will be found today. Some snow showers are also possible today for northern and central portions, especially from Havre to Lewistown areas, with dry conditions expected elsewhere. Precipitation looks to diminish late tonight, with mainly dry and continued warming conditions expected for Tuesday.

DISCUSSION.

AVIATION. Updated 449 PM MST Mon Dec 9 2019 (10/00Z TAFs)

Some light snow continues to fall along and near a KLWT to KHVR line, which may cause MVFR/IFR/LIFR conditions through 6Z. Low clouds and fog are moving back into KWYS this evening and will likely persist through much of this TAF period. Mostly VFR conditions prevail elsewhere as mid-level clouds pass through the region.

PREV DISCUSSION. /ISSUED 450 PM MST Mon Dec 9 2019/ Tonight through Wednesday Night . Scattered snow shower activity over northcentral Montana continues this afternoon under breezy northwesterly flow, as a series of weak disturbances traverse the region through tonight. Given the convective nature of these snow showers, moderate to heavy snowfall could be possible under some of the snow bands that develop throughout the evening. Higher pressure will begin to build into the area Tuesday, bringing drier and slightly warmer conditions to the region through mid week. Models are showing another disturbance tracking into the region Wednesday, with limited moisture and not as strong as the disturbance currently tracking through the area. As a result only scattered snow showers are expected at this time with the best chances coming across the mountains. Breezy winds ahead of this system could continue to warm temperatures for Wednesday, and perhaps bring some areas of blowing snow. -TP

Thursday through Monday . Much of the long term could then see periods of unsettled weather, although will lack any large scale organized storm systems. Thursday sees strengthening and moist westerly flow across the area. The result will be one more day of warming temperatures, with chances for snow mainly along and west of the divide. Breezy conditions will also be found on Thursday, perhaps bringing some blowing of fresh snowfall. Friday through the weekend then sees a cooling pattern as northwest flow opens the door for weak disturbances to move through the region at times. As mentioned before models only indicating scattered snow shower activity at this point with no real large scale organized system expected across the area, and placing the better chances in the mountains. This northwest flow pattern may continue into early next week, although does not appear to be as unsettled. -Anglin

PRELIMINARY POINT TEMPS/POPS. GTF 18 35 23 39 / 0 0 0 10 CTB 13 31 17 32 / 0 0 0 10 HLN 16 37 21 40 / 0 0 0 10 BZN 11 35 14 37 / 0 0 0 10 WEY 8 26 14 28 / 10 10 0 20 DLN 12 32 17 35 / 0 0 0 10 HVR 12 26 12 27 / 50 0 10 20 LWT 16 35 18 38 / 60 0 0 10

TFX WATCHES/WARNINGS/ADVISORIES. None.

http://www.weather.gov/greatfalls


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Bozeman, Gallatin Field, MT38 mi90 minN 010.00 miOvercast25°F19°F78%1024 hPa

Link to 5 minute data for KBZN

Wind History from BZN (wind in knots)
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Last 24hrS3SW3CalmCalmCalmS4CalmE3NE3CalmCalmCalmSW4CalmCalmS5SE5SE5S3S5CalmCalmCalmCalm
1 day agoNE3CalmCalmCalmCalmCalmNW12N7W10NW8NW9SW9W11W7W5W3CalmW4CalmNW3CalmCalmNE3W3
2 days agoSE4SE7NW6SE3S4CalmCalmSW4N3SE73S7SW10Calm3E3E4CalmCalmNE4NE8CalmE5SE5

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    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 Great Falls, MT (6,6,7,8)
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Ground Weather Radar Station Billings, 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 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.