Saturday, November18, 2017

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 7:27AMSunset 4:51PM Saturday November 18, 2017 6:23 PM MST (01:23 UTC) Moonrise 7:23AMMoonset 5:29PM Illumination 0% Phase: New Moon; Moon at 0 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 182234
area forecast discussion
national weather service billings mt
334 pm mst Sat nov 18 2017

Short term Valid for Sun and mon...

for the rest of the weekend the story will be the wind as strong
pressure gradients develop across the mountain foothills. The idaho
to lewistown pressure gradients have increased through the
morning and afternoon hours. The winds we experienced this
afternoon were a combination of these increasing pressure
gradients and warm temperatures allowing us to mix into some of
the stronger winds in the mid-levels.

Moving into tonight, we will lose the effect of the mixing so
expect winds in much of the lower elevations east of harlowton
and big timber to weaken some overnight. The winds will slightly
weaken this evening along the foothills before increasing again
overnight. While the gradient remains steady through tonight,
warmer air moving in over the mountain-tops, and winds beginning
to turn more to the southwest, will help increase the winds in
our gap locations such as livingston, and nye where wind gusts up
to 60 mph are possible tonight. Windy conditions will keep temps
warm in the foothills and generally in the low 30s. East of
billings and the bighorn mountains, expect cooler temperatures in
the mid 20s as less wind is anticipated.

Strong winds continue through Sunday afternoon and then increase
again overnight Sunday into early Monday as even stronger pressure
gradients and mid-level winds move into our foothill locations. Currently
expecting 60 to 70 mph wind gusts for our foothill locations in
livingston, and nye. Expect these wind gusts to persist through
Monday morning before a cold front approaches the forecast area
from the north by the early afternoon. This front will help
decrease the pressure gradients across the foothills through the
afternoon so only have the wind advisory going through noon on
Monday. The main cold front pushes through the region Monday night
bringing scattered rain snow showers behind the front into
Tuesday morning. The mountains should get another shot of snow
with about 2 to 4 inches of snow possible Monday night into
Tuesday morning. Dobbs

Long term Valid for tue... Wed... Thu... Fri... Sat...

Tuesday will likely be the coolest day of the week as canadian
surface high drops into the dakotas giving us cooler east winds.

Cannot rule out some overrunning light snow or mixed precip across
our western and central CWA with moist isentropic ascent moving
across the pac nw. Temps will be coolest in our east of course.

Temps in our west may jump up in the afternoon if SW winds develop
off the foothills, which seems like a decent bet as current
models show pressure falls in central and southeast mt by
afternoon. Have expanded pops a bit on Tuesday, and raised temps
slightly in our west... Where we could see 50 again... As opposed to
the upper 20s or lower 30s in our far east.

Warming trend in store for Wednesday and Thursday as ridge settles
in with increased downslope gradients. Should see high temps to
near 60f Wednesday then well into the 60s on thanksgiving. We
could reach record highs (lower-mid 60s) on the 23rd, but records
for thanksgiving day itself will be tougher. As for precip, we
could see some brief warm frontal rain snow develop late Tuesday
night into Wednesday, otherwise expect a dry period for the lower
elevations. We'll also see another period of enhanced winds along
our western foothills from Tuesday night through Thursday.

Advisory speeds are possible at livingston and nye.

Next potential weather-maker of interest will be a weak shortwave
coming off the pacific on Friday. Airmass looks to stay warm
enough for mainly rain showers at lower elevations. Should see a
few inches of snow for our mountains. System exits Friday night
and ridging will build back in for Saturday. Should see temps
return to closer than normal by the end of the week.


Vfr conditions will prevail over the next 24 hours. Expect
conditions to breezy across much of S mt, especially around klvm
where wind gusts will increase this evening towards 50 kts.

Expect winds around klvm to remain strong increase Sunday night.


Preliminary point temp pops
Sun Mon Tue Wed Thu Fri sat
bil 031 051 032 049 026 042 035 060 044 063 041 053 031 043
00 N 02 W 22 W 21 N 11 b 22 W 11 b
lvm 032 050 035 045 031 049 040 059 047 060 042 049 027 041
00 N 04 W 23 W 21 N 11 N 23 W 21 b
hdn 026 054 028 052 024 042 030 062 037 065 038 054 028 045
00 u 02 W 21 b 11 N 11 b 22 W 11 b
mls 026 053 027 049 018 033 025 060 037 063 039 053 027 040
00 u 01 N 11 b 12 W 00 b 12 W 11 b
4bq 025 057 027 052 022 039 028 061 040 064 039 054 029 043
00 u 01 N 21 b 01 N 00 b 12 W 21 b
bhk 023 052 025 052 011 029 018 056 034 060 036 052 025 037
00 u 01 N 10 u 02 W 11 b 12 W 10 b
shr 023 055 028 053 025 043 029 063 035 065 036 054 027 045
00 u 02 W 11 b 11 b 00 b 12 W 21 b

Byz watches warnings advisories
Mt... Wind advisory in effect from 8 pm this evening to noon mst
Monday 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, MT10 mi28 minN 010.00 miFair28°F19°F69%1026.8 hPa

Wind History from BZN (wind in knots)
Last 24hrSW4W9W8W8NE3CalmS5SE3SE6SE3SE7S4SW3N9N8NE9N7N3N5NW4CalmS4SW4Calm
1 day agoE3S5S5CalmSE5CalmS5NW8W6S4SW4CalmN5S4SE4NW3E4E7NW7W9W10NW18NW5S4
2 days agoCalmCalmCalmCalmN3NE5W3CalmCalmSE7S6CalmSE44CalmCalmS8SW9W12

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 (20,4,5,8)
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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 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.