Friday, March24, 2017 L-36.com


Marine Weather and Tides
Big Sky, 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 7:17AMSunset 7:43PM Thursday March 23, 2017 10:22 PM MDT (04:22 UTC) Moonrise 3:57AMMoonset 1:58PM Illumination 12% Phase: Waning Crescent; Moon at 26 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 Big Sky, MT
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location: 45.26, -111.31     debug


Area Discussion for - Great Falls, MT
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Fxus65 ktfx 240220
afdtfx
area forecast discussion
national weather service great falls mt
820 pm mdt Thu mar 23 2017

Update
Little to no updates needed this evening, as the afternoon
forecast is holding firm. A weak disturbance will encroach on the
hi-line this evening, however, moisture is very limited and am
only expecting a slight increase in cloud cover over north central
montana. For this reason, did adjust cloud cover up slightly.

With this slight increase in cloud cover, did warm overnight lows
a degree or two to account for a decrease in radiational cooling
overnight. Winds will continue to decrease throughout the
nighttime hours, before becoming breezy from the south to
southwest tomorrow morning. - moldan

Aviation
Updated 2300z.

Vfr will prevail at all terminals through the TAF period, while
westerly flow aloft backs to southwesterly after 12z/fri due to an
approaching weather disturbance. After 18z/fri, periods of mountain
obscuration due to cloud cover and snow showers are possible along
the continental divide.

Jaszka

Hydrology
300 pm update.

Water levels on the milk river and its tributaries in blaine/hill
counties remain elevated but are mostly below flood stage and
continuing to gradually decrease. Lodge creek near the canadian
border remains near minor flood stage but is anticipated to decrease
further tonight with gauges upstream all showing decreasing water
levels. No flood warnings are currently in effect but we will
continue to closely monitor river conditions in these areas. Hoenisch

Prev discussion
/issued 500 pm mdt Thu mar 23 2017/
tonight through Saturday... Large upper low continues to bring
widespread precip to our south and east... Leaving us under mainly
dry ridging. Still can't rule out a few rain and mountain snow
showers across the west and south... With just some fair weather
cumulus clouds elsewhere. A weak wave does skirt the hi-line this
evening... Perhaps producing a very isolated shower. Confidence was
not high enough to include this in the forecast. Overnight
tonight into Friday morning... The dry air in id moves into our
region bringing mainly clear and dry conditions. Dry conditions
and breezy southerly winds are expected to be the story for
Friday. With rh values expected to be in the 20s and wind gusts
generally 20 to 30+ mph... Those trying to get a start on spring ag
burning should use caution or delay burning operations. Ridge
pushes out of the region Friday evening... Bringing increasingly
moist SW flow. This combined with a weak cold front may produce a
few rain showers... With snow showers above 5000 feet Friday
evening through Friday night. Broadscale trough could then bring
chances for rain and snow showers across western... Southern... And
some central portions of the cwa. Snow levels could remain around
5000 to 6000 feet for Saturday... With little snow accumulations
expected. Winds may again be breezy on Saturday... Mainly across
northern portions... Which could once again elevate fire weather
concerns. Friday will see temps return into the 60s... With Friday
night's front bringing a slight cool down... But still above
average... Temperatures on Saturday. Anglin
Saturday night through Thursday... Remaining areas of rain or snow
clear to the east Saturday night with a departing upper level
trough. Ridging aloft will maintain fair weather Sunday and Sunday
night. The next pacific system advances moisture up to the
continental divide by Monday afternoon. This longwave trough splits
while crossing the intermountain west, producing the highest chances
for precipitation Monday night across southwest montana. Snow levels
remain uncertain, but currently suggest snow or mixed rain/snow
could occur overnight down into the southwest valleys Monday night.

Conditions improve later Tuesday through Thursday morning aside from
scattered, mainly mountain showers. Temperatures remain slightly
above average through the period. Pn

Preliminary point temps/pops
Gtf 29 62 38 58 / 0 0 20 20
ctb 25 55 34 52 / 0 10 10 10
hln 31 61 37 55 / 0 10 30 20
bzn 25 56 36 52 / 0 0 30 30
wey 17 42 29 40 / 10 10 50 50
dln 27 54 33 51 / 0 10 30 20
hvr 28 62 37 59 / 10 0 20 0
lwt 27 58 36 53 / 0 0 10 20

Tfx watches/warnings/advisories
None.

Weather.Gov/greatfalls


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Bozeman, Gallatin Field, MT38 mi27 minN 010.00 miFair41°F26°F55%1016.3 hPa

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Last 24hrN4SE5S4CalmCalm3CalmW7W5W6W7NW5NE3NW1336W4W7N7N7N3NE4NE3Calm
1 day agoN9NW7E5SW6W10SE11S8NW5CalmS3CalmCalmCalm3NW8W4NW4NW12
G17
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2 days agoCalmW3CalmCalmCalmNW3CalmCalmN3CalmCalmCalmN3CalmW4CalmNW3E4CalmSW7S5NW3NW5N8

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
wmap_P
IR Satellite Image from GEOS
west_satellite

GOES Local Image of NorthernPlains    EDIT
Geos

Wind Forecast for Great Falls, MT (0,6,7,8)
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Ground Weather Radar Station Billings, MT
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weather_mapweather_map weather_map

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Disclaimer:
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.