Tuesday, September25, 2018 L-36.com

Marine Weather and Tides
Bozeman, MT

Version 3.4
What's New / NOTES
9/17/2018 XTide broke when 1and1 "upgraded" my server. It has been esculated. I am sorry for the problem.

Sunrise 7:14AMSunset 7:16PM Tuesday September 25, 2018 6:37 AM MDT (12:37 UTC) Moonrise 7:00PMMoonset 6:36AM Illumination 100% Phase: Full Moon; Moon at 15 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 250854
area forecast discussion
national weather service billings mt
254 am mdt Tue sep 25 2018

Short term Valid for tdy and wed...

early morning radar imagery showed scattered showers moving se
toward the forecast area, and klvm was reporting light rain at
08z. Axis of the upper trough was over E mt per water vapor
imagery, and shortwave energy was moving SE toward the forecast
area in the back side of the trough. This energy will move through
the area this morning, bringing isolated to scattered showers. A
few snow showers will mix in with the rain showers over and near
the mountains. Leaned on the WRF for the pop forecast as it had a
good handle on the situation this morning and should capture the
convective elements well. A few showers and thunderstorms will
linger over the SE S central tier of the area this afternoon as
energy exits the area. Combination of good mixing and subsidence
behind the wave will support breezy conditions over SE mt,
especially near the dakotas border. It will be a cool day, with
highs in the mid 50s to lower 60s.

A dry, flat NW flow will be over the area tonight, with clear
skies and light winds. Temperatures will drop into the 30s. Have
added patchy frost in locations where lows will be at 35 degrees
or lower. Some channeled energy will move through the NW flow on
Wednesday, but the airmass will remain dry. Surface winds will
turn NW during the day and good mixing will promote breezy windy
conditions across the area. It will be warmer with highs in the
60s to around 70 degrees. Arthur

Long term Valid for thu... Fri... Sat... Sun... Mon...

main message is that lower elevation snow is possible but
accumulations are not likely Thursday night into Friday night.

This will likely catch peoples attention but not have significant
impacts. Cold front moves down from the north early Thursday with
frontogenesis supporting light precipitation along the band since
upper level dynamics are not very strong. Frontogenesis weakens
Thursday night but flow becomes upslopish to support the
precipitation. Bigger question is how much of the precipitation
manages to fall as snow. With airmass moistening up through the
day on Thursday not much room for evaporative cooling Thursday
night and models show 850 mb temperatures just reaching 0c by
Friday morning before some diurnal warming boosts temperatures up
a bit. Also another window Friday night but precipitation is
winding down at that time so amounts are less. So expect daytime
temperatures in the 40s Friday with low temperatures in the mid
30s Thursday night and Friday night. This will allow snow to
fall, but accumulations should not be impactful and most areas in
lower elevations would only see a dusting at most. Mountains will
see 2 to 4 inches with around an inch in the foothills.

By Friday night the main band of precipitation begins to lift
northeastward as flow aloft begins to shift from northwesterly to
westerly. Isentropic lift helps keep the band in tact as it moves
up into northern parts of southeast montana before lift GOES away
on Saturday. Saturday night into Sunday a strong disturbance over
the pacific northwest lifting northeastward brings another round
of isentropic lift while pressure gradients support an increase in
low level eastern flow. Should see another round of precipitation
as this scenario sets up but temperatures are warmer which should
eliminate threat of snow. Temperatures will remain below normal
Sunday but will moderate a bit Monday and Tuesday. Borsum

Isolated to scattered showers will occur over the area this
morning. Some snow will mix in with the rain showers over and near
the mountains. A few showers and thunderstorms will linger over
southern areas, mainly from kbil to kshr e, this afternoon.VFR
will prevail today, but localized MVFR cannot be ruled out in the
showers. Expect gusty NW surface winds E of kbil, especially near
the dakotas border.VFR will prevail tonight across the area.

Expect localized to areas of mountain obscuration today. Arthur

Preliminary point temp pops
Tdy Wed Thu Fri Sat Sun mon
bil 061 039 069 043 052 038 048 034 052 037 056 039 061
3 W 00 N 24 W 64 W 32 W 23 W 32 w
lvm 059 034 068 039 059 037 049 031 054 036 058 036 064
2 W 00 N 12 W 53 W 22 W 25 W 42 w
hdn 059 037 069 042 053 039 049 035 054 038 056 040 063
3 t 00 N 24 W 55 W 42 W 23 W 31 e
mls 060 038 068 042 052 037 050 034 055 039 057 040 061
2 W 00 b 35 W 32 W 32 W 24 W 42 w
4bq 055 035 068 040 051 037 048 035 053 039 059 041 064
2 t 00 N 25 W 54 W 42 W 22 W 31 b
bhk 055 036 064 040 052 034 048 031 052 036 054 038 058
2 W 00 b 25 W 21 b 32 W 23 W 42 w
shr 057 034 069 040 054 036 047 033 054 038 061 038 064
2 t 00 u 13 W 85 W 22 W 12 W 31 b

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 mi1.7 hrsN 010.00 miFair37°F34°F89%1025 hPa

Wind History from BZN (wind in knots)
Last 24hrS3SE4CalmNW4Calm3W10W7W10NW5W5W4N9N4SW3SW4CalmCalmS5SE7NE4SE4CalmCalm
1 day agoCalmCalmW3NW7E5S3NW5CalmE5NW19
2 days agoSE7SE3CalmCalmCalmSE3SW5SW14SW6W6SW6SW9NW7N5NW10SW9SW10CalmS10S6S7CalmSE12Calm

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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GOES 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.
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Wind Forecast for Billings, MT (8,2,3,4)
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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 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.