Tuesday, December10, 2019
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Marine Weather and Tides
South Glastonbury, 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 4:53 PM MST (23:53 UTC) Moonrise 3:59PMMoonset 6:02AM Illumination 99% Phase: Waxing Gibbous; Moon at 14 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 South Glastonbury, MT
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location: 45.26, -111     debug


Area Discussion for - Billings, MT
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FXUS65 KBYZ 102112 AFDBYZ

Area Forecast Discussion National Weather Service Billings MT 212 PM MST Tue Dec 10 2019

DISCUSSION. Tonight through Wednesday Night .

Upper air analysis shows 140kt H3 jet over far eastern MT, shifting slowly eastward as ridge is building from the west. A shortwave dropping into the northern plains will be associated with another backdoor cold front, with pressure rises nearing the Saskatchewan/Montana border at 21z. Along baroclinic zone will be periods of light snow late this afternoon and evening in our far east, mainly along and northeast of a line from Miles City to Alzada. Not much accumulation (less than an inch), but there will be reduced visibility affecting travel. Precip will taper off overnight as forcing wanes.

There is potential for some valley fog on western edge of backdooring cold front, from roughly Musselshell to southern Carter counties, a region which will see cooling w/ the front along with clearing skies. Have added mention of fog from 06-15z.

Gap winds will increase tonight with another period of lee side pressure falls and backing mid level winds. Mountain top flow will be modest (35-40 kts) but low level stability and orientation of gradient will be favorable for strong SSW winds at Livingston and Nye. Have issued a wind advisory for these locations from 8 pm this evening to 3 pm Wednesday . with peak gusts (50-60 mph) expected to occur overnight into early tomorrow.

Pacific shortwave will arrive Wednesday afternoon bringing a chance of rain/snow showers mainly east of surface trof (ie east of Billings) with downslope winds dominating our west. Our western mountains will pick up a little snow.

Temperatures will continue to moderate tomorrow as the cold Canadian air is eventually replaced by air of Pacific origin, though our east will remain on the cold side for one more day. Western areas will see highs into the 40s tomorrow.

JKL

Thursday through Tuesday .

Unsettled weather will be a concern through the first half of the forecast period. Strong and gusty winds in western gap areas, including Livingston, Big Timber, and Harlowton will be a concern early and late in the period, but at this time winds appear to peak at the 50 to 55 mph range at times.

Thursday morning will see snow showers moving over the mountains before shifting onto the lower elevations in the afternoon. Precip is expected to switch to rain over lower elevations, due to the above normal temps. Precip will transition back to snow in the evening and overnight. The mountains could see several inches of snow, while the little accumulation is expected for lower elevations. Winds around Livingston will be strong and gusty Thursday and Thursday night, but should remain sub- advisory.

A backdoor front will slide into the region late Friday bringing colder temperatures, and potential snow across the region throughout much of the day. Best chance for snow will be over central and western zones, especially over foothills, with upsloping flow support. Specific details remain a bit uncertain this far out. Winds around Livingston/Big Timber area will remain gusty Friday until the front moves into the area later Friday, scouring out the surface trof. The front will continue to impact southeastern Montana into the weekend with light snow, before shifting east towards the ND border Sunday.

Winds will increase along Livingston/Nye/Big Timber as the front moves out on Sunday. Guidance varies a bit on timing of return of stronger winds, but operational ECMWF supports quickly redeveloping lee troffing and gusts of 50 to 55 mph by Monday morning around Livingston. GFS holds off until Monday night. Have included high gusts at this time with nod to ECMWF, but kept below advisory strength. Gusty gap winds and dry conditions are expected to continue through the end of the forecast period.

High temps will be warmest on Thursday with temps in the upper 30s and mid 40s. Temps will remain above normal for Friday in most locations ahead of the front, but will cool off into the low to mid 30s for Saturday and Sunday. Temps will trend upward through the early portion of the work week, with highs in upper 30s to low 40s in most locations.

Gilstad

AVIATION.

Areas of light snow will impact eastern areas near KMLS, KBHK and K97M thru tonight . bringing periodic MVFR to IFR flight conditions which will linger into tomorrow morning. VFR will prevail to the west, though mountains may be periodically obscured in light snow showers. There is also a risk of localized valley fog mainly north and east of KBIL between 06-15z, though confidence in this impacting an airport is low. Gusty SW-W winds will impact the western foothills. Gusts to 35 kts at KLVM late this afternoon will increase to 45 kts tonight into Wednesday. By Wednesday afternoon, a Pacific disturbance will bring some rain/snow showers, and mountains will become frequently obscured. JKL

PRELIMINARY POINT TEMP/POPS.

Wed Thu Fri Sat Sun Mon Tue ----------------------------------------------------------- BIL 024/042 027/046 032/044 020/035 021/034 020/036 021/039 01/E 02/R 33/O 43/S 22/S 11/B 01/N LVM 030/042 029/045 030/040 020/033 019/030 016/032 018/035 01/N 04/O 54/O 54/S 22/S 12/S 10/N HDN 016/041 021/045 028/044 016/034 014/034 015/037 017/039 02/W 02/O 34/O 54/S 22/S 11/B 11/B MLS 012/035 018/042 025/037 012/023 012/030 018/035 019/039 42/J 12/O 23/O 32/S 10/E 00/B 10/B 4BQ 014/037 019/041 027/040 015/029 013/030 016/033 017/036 22/W 01/B 22/O 32/S 11/E 00/B 10/B BHK 008/029 014/038 021/034 007/018 007/027 015/031 017/034 62/J 21/B 12/S 21/E 10/E 00/B 10/B SHR 017/042 019/044 024/042 015/033 013/031 010/036 014/039 00/B 01/B 34/O 43/S 22/S 11/U 11/B

BYZ WATCHES/WARNINGS/ADVISORIES. MT . Wind Advisory in effect from 8 PM this evening to 3 PM MST Wednesday FOR ZONES 65-66. WY . None.

weather.gov/billings


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Bozeman, Gallatin Field, MT37 mi58 minN 010.00 miFair33°F21°F61%1024.3 hPa

Link to 5 minute data for KBZN

Wind History from BZN (wind in knots)
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Last 24hrSW4CalmCalmS5SE5SE5S3S5CalmCalmCalmCalmS4SE3SE4SE6SE7SE3S4CalmCalmCalmCalmCalm
1 day agoW11W7W5W3CalmW4CalmNW3CalmCalmNE3W3S3SW3CalmCalmCalmS4CalmE3NE3CalmCalmCalm
2 days agoSW10Calm3E3E4CalmCalmNE4NE8CalmE5SE5NE3CalmCalmCalmCalmCalmNW12N7W10NW8NW9SW9

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Billings, MT (18,4,5,8)
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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.