Wednesday, January17, 2018

Marine Weather and Tides
Bozeman, MT

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 7:57AMSunset 5:11PM Wednesday January 17, 2018 1:48 AM MST (08:48 UTC) Moonrise 8:18AMMoonset 5:59PM Illumination 0% Phase: New Moon; Moon at 1 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 Bozeman, MT
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location: 45.71, -110.99     debug

Area Discussion for - Billings, MT
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Fxus65 kbyz 170314
area forecast discussion... Updated
national weather service billings mt
814 pm mst Tue jan 16 2018

Temperatures which began falling just before sunset in some areas
have steadied out as falling surface pressure over alberta is
increasing southerly low level flow for most areas. A few very
sheltered valleys may fall a few more degrees but in general most
areas are close to overnight minimum forecasts and do not expect
much more cooling. No updates. Borsum

Short term Valid for Wed and thu...

shallow arctic air making for a difficult temp forecast tonight
and possibly even tomorrow. Most of the western and central areas
have warmed up nicely today, but cold air in eastern valleys has
been more stubborn. However, all progs agree that low level flow
will turn more westerly tonight. So temps in eastern valleys might
slowly rise overnight at some locations rather than cool off.

Western foothills will benefit from weak lee-side troughing and
remain breezy and relatively mild overnight. Many locations should
be much milder tonight.

For Wednesday, short wave moves across canadian border and helps
scour out remaining cold air in east. Should see nice warming
over the entire cwa. Even milder temps expected on Thursday as
short wave ridge and prefrontal warming take place. Winds will
slowly increase in the foothills. By Wednesday evening, pressure
gradient tightens across foothills. Local tools and guidance
suggest advisory level winds are likely. Future shifts will
monitor a bit longer, but advisory is certainly supported from
what we currently see... From Wednesday evening through Thursday
afternoon, and possibly into Thursday evening. At that point,
pacific weather system pushes through our region.

Our main concern with this frontal system Thursday night is the
slight chance of some ice pellets. Freezing precipitation falling.

Best chance of this is from billings eastward to the miles city
vicinity in those river valley locations. The bulk of
precipitation looks to come after the 700mb cold front moves
through early Friday morning, but any lighter precipitation may be
mixed prior to that Thursday night. We will monitor this closely
as even through chance is slight, it would have a large impact on
travel conditions. Bt

Long term Valid for fri... Sat... Sun... Mon... Tue...

little in the way of changes for the extended forecast period,
with models in reasonably good agreement on overall progressive

Pacific SW flow will persist through Friday evening, and combine
with jet divergence to the area as a strong pacific jet sinks se
through the region. Fairly good moisture appears to be in place,
with pwats around a half an inch. So inherited pops look pretty
good. Currently continuing with rain snow mix much of Friday
afternoon evening, but there is some concern for freezing rain as
cold air undercuts warm moist airmass. Will continue to watch
closely, but fzra potential does not look as favorable as in
previous runs.

Precip will clear the region by Saturday morning, and upper
ridging will build back into the region Saturday night Sunday
morning. Sunday will see strong and gusty winds develop in and
around livingston, nye, and big timber, as a strong surface high
moves west to east across yellowstone national park. Southeast
winds, with gusts around 60mph are possible Sunday
afternoon evening. A shortwave will cross the region to flatten
ridge on Sunday night Monday morning, and give surface high a kick
eastward. This will also bring reinforcing shot of cool air, but
limited chance of precip as atmosphere is relatively dry at this

Upper level flow remains flat through remainder of period,
bringing some downslope low and warming temps, until Tuesday, when
another wave is progged into the region, but timing is an issue
with this wave.

Temperatures will generally be in the 30s through the end of this
week. Friday looks to be the warmest day, with upper 30s in most
locations. Monday and Tuesday will be cooler behind reinforcing
shortwave Monday and cold front Tuesday, with highs in 20s to end
the period. Aag

Breezy conditions will continue in and around klvm, with gusts
around 30kts possible overnight. Winds vc klvm will vary from W to
nw overnight, becoming SW Wednesday morning. Llws is possible over
southeast mt late tonight, including at kmls.VFR conditions are
expected to prevail across the area through the period. Stp

Preliminary point temp pops
Wed Thu Fri Sat Sun Mon tue
bil 022 041 029 048 029 038 019 032 015 032 014 025 010 025
00 u 00 N 55 o 31 b 11 N 22 S 22 s
lvm 026 043 033 049 029 037 015 033 015 034 019 034 016 033
00 N 01 N 86 o 31 N 22 S 33 S 33 s
hdn 010 039 020 045 024 038 016 034 012 031 010 025 008 026
00 u 00 b 35 o 31 b 11 b 22 S 22 s
mls 009 034 020 040 027 037 017 030 011 029 007 018 007 016
00 u 00 b 33 o 21 b 11 b 12 S 22 s
4bq 012 040 021 045 027 038 019 034 014 033 011 026 010 023
00 u 00 b 14 o 21 b 11 b 12 S 22 s
bhk 010 038 020 044 027 040 019 034 011 031 011 021 008 016
00 u 00 b 13 o 21 b 11 b 12 S 22 s
shr 015 042 023 048 028 037 018 031 014 033 015 028 012 027
00 u 00 b 15 o 32 S 11 b 12 S 22 s

Byz watches warnings advisories
Mt... None.

Wy... None.

Weather.Gov billings

Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Bozeman, Gallatin Field, MT10 mi52 minSSW 310.00 miFair11°F6°F81%1033.9 hPa

Wind History from BZN (wind in knots)
Last 24hrS3SE6S53SE5CalmS3S4SE3SE4E3CalmCalmCalmS5SE6E3CalmSE3CalmS6SE5S7E4
1 day agoS7S8SE11SE5S7S7S5N8CalmW4NW6N5CalmW3W4CalmCalmS5S4S4CalmSE3CalmS3
2 days ago--CalmSE3SE4CalmSE8S7SE4SE3S6CalmCalmCalmS4CalmNE4CalmCalmS5CalmS5CalmCalmSW9

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map and Satellite Images
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Weather Map
IR Satellite Image from GEOS

GOES Local Image of NorthernPlains    EDIT

Wind Forecast for Billings, MT (3,6,7,8)
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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 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 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.