Wednesday, March29, 2017

Marine Weather and Tides
Bozeman, MT

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 7:05AMSunset 7:51PM Wednesday March 29, 2017 9:03 AM MDT (15:03 UTC) Moonrise 7:21AMMoonset 8:59PM Illumination 5% Phase: Waxing Crescent; Moon at 2 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 290928
area forecast discussion
national weather service billings mt
328 am mdt Wed mar 29 2017

Short term Valid for tdy and thu...

flat ridging and downslope winds will yield a dry and mild day
today, with temps getting back to the low-mid 60s most locations.

Attention then turns to pacific trof which will push inland
tonight, then dive thru the great basin and to the 4-corners
region Thursday and Thursday night. Some model issues still need
to be worked out, but the 00z model runs did come in with a little
better agreement.

Our western mountains will see increasing chances of rain/snow
tonight due to the moistening pacific flow and height falls ahead
of trof. Much better chance of precipitation for our mountains and
western/central lower elevations begins Thursday. One issue that
still needs to be resolved is fate of leading weak shortwave ahead
of main trof. This wave will bring rain showers to our western
lower elevations by Thursday morning. If this wave continues to
lift aggressively into northeast mt, as some models have
suggested, we could see a period of drying as main low digs well
to our w/sw. If this initial wave remains better phased with the
main low, pcpn chances will remain high thru Thursday, with
upslope precipitation becoming the focus by Thursday night.

Tonight's models have trended toward the latter scenario and are
on the wetter side, and have leaned in this direction for the

So, good chance of showers across most of west/central parts
Thursday, with heaviest precip shifting to southern upslope areas
by Thursday night and Friday as northerly winds deepen to above
mountain top level. Orographic ascent will extend into the bottom
of the dendritic layer, but it should be noted that the dendritic
layer is expected to remain high enough and extend into a dry
layer near 600mb such that snow ratios will not get too high with
this event. A model consensus QPF on the order of an inch should
yield snowfall of 10-15 inches above 6-7kft, so have issued a
winter storm watch to cover the north aspects of the beartooth
absarokas and bighorns, with Thursday night and Friday being the
prime periods.

Lower elevations will remain too warm for anything but rain with
this system. Rainfall of 0.25-0.75 inches is expected for much of
the area, again per a model consensus. A mix with wet snow is
still a possibility at places like red lodge and story, but 850mb
temps are expected to fall to no colder than around +3c, and do
not see a risk of significant accumulation. With improved
confidence, have raised pops across our west Thursday and over our
upslope areas Thursday night.

After a mild day today, temps on Thursday will turn cooler in our
west. Highs tomorrow will range from the lower 50s in our west to
the low-mid 60s in our east.


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

rain, and high elevation snowfall, will continue Friday as the
trough continues to move east across montana. The ECMWF continues
to show a better upslope event into the mountains. This is in
better agreement with the last several days of the gfs. With the
rainfall, temperatures in the superblend remain too warm, so have
continue to trend towards the raw model consensus. Precip will
move out of the area through the afternoon and early evening.

Ridging takes over for Saturday with temperatures rebounding back
into the 60s.

Sunday will be a generally dry and warm day across the area.

However, some precip may begin to push into the mountains. The
models continue to show considerable differences in timing with
the next approaching trough. The GFS and the ECMWF are about 6 to
12 off in timing, with the ec being the faster solution. Also the
gfs ensemble shows much higher variability from the weekend
onward. Much of the variable is likely be related to the issues
the models have been having with the current system. For now have
continue just generally broadbrushed pops, and given the wetter
conditions, more towards the raw model temperatures again. Reimer

Vfr conditions are expect across the area today. Winds around klvm
will increase this morning with gusts up to 30kts. A few mountains
showers are possible mainly after 06z. Reimer

Preliminary point temp/pops
Tdy Thu Fri Sat Sun Mon tue
bil 063 043/056 041/051 035/061 040/058 038/052 033/051
0/b 26/w 66/r 20/b 11/b 34/w 33/w
lvm 060 042/052 034/049 029/057 035/057 033/045 028/045
1/n 57/w 64/r 10/b 13/w 33/w 33/w
hdn 064 037/061 040/052 035/061 038/062 036/054 033/052
0/b 14/w 66/r 41/b 11/b 33/w 32/w
mls 064 040/062 042/055 037/060 041/063 039/058 037/058
0/b 03/w 54/r 31/b 11/b 33/w 33/w
4bq 063 039/065 041/053 037/058 039/061 038/057 037/055
0/u 01/e 44/r 51/e 11/b 23/w 23/w
bhk 062 037/064 040/054 038/057 038/062 036/056 036/053
0/b 01/e 34/r 51/e 11/b 23/w 34/w
shr 061 034/060 038/048 032/055 035/058 035/050 029/050
0/u 02/w 77/r 61/b 11/b 34/w 33/w

Byz watches/warnings/advisories
Mt... Winter storm watch in effect from Thursday morning through
late Friday night for zone 67.

Wy... Winter storm watch in effect from Thursday morning through
late Friday night for zone 98.


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Bozeman, Gallatin Field, MT10 mi68 minSE 610.00 miFair34°F27°F76%1021.6 hPa

Wind History from BZN (wind in knots)
Last 24hrCalm5W5NW9SW7Calm3W6W3CalmSE7S5N6S3S4S6S4SE7SE4SE3SE4S6SE6E4
1 day agoCalmN65NW7NW75NW7W14NW19N14W6SW5SW10SW10CalmW3W5W6NW5NW3W6SW4E3E3
2 days agoS3CalmN43SE4CalmCalmSW13SW12SW8S7SW9SW16

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 (11,2,3,4)
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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.