Monday, May29, 2017 L-36.com


Marine Weather and Tides
Big Sky, MT

Version 3.4
What's New / NOTES
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 5:37AMSunset 9:05PM Sunday May 28, 2017 11:46 PM MDT (05:46 UTC) Moonrise 7:51AMMoonset 11:06PM Illumination 14% Phase: Waxing Crescent; Moon at 4 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 290442
afdtfx
area forecast discussion
national weather service great falls mt
1040 pm mdt Sun may 28 2017
updated aviation discussion

Update
Main update this evening is to significantly trend down the
isolated shower and thunderstorm activity along the east slopes of
the rockies and into southwest montana. The main area of activity
currently is in the vicinity of great falls, and it should
diminish after sunset as it loses daytime heating and moves into
the area of the big little belt mountains. Any lingering showers
and thunderstorms should be done by midnight. The rest of the
forecast remains in good shape.

Coulston

Synopsis
An upper-level ridge of high pressure currently over the pacific
northwest will slowly move eastward over the next few days. As a
result, scattered showers and thunderstorms over our area today will
become more isolated for Monday through Wednesday. Temperatures
trend gradually warmer through Wednesday. Chances for showers and
thunderstorms increase again late in the week.

Aviation
Updated 0440z.

With upper level ridging exerting its influence on the area,
tranquil conditions withVFR CIGS and visibility should predominate
all terminals through the next 24 hours. Enough instability remains
over the mountains after 18z Monday to trigger a few showers storms.

However, with light winds aloft any shower storm activity will
remain confined to the mountainous terrain. Cassell

Hydrology
The big hole river near melrose is forecasted to go above
flood stage later this week. The rate the river rises this week
is greatly dependent on how fast the higher elevation snow pack
melts. Thus we will continue to monitor for possible flood
highlights later this week. Brusda

Prev discussion
Issued 500 pm mdt Sun may 28 2017
tonight through Tuesday... Scattered rain showers and thunderstorms
have been most concentrated today over fergus county and along
central portions of the rocky mountain front. Satellite imagery
reveals boundary layer cumulus marking a convergence line running
from near cut bank to havre to lewistown. This is providing a
source of initiation for the observed showers. Short-term model
guidance suggest that a minor short wave feature aloft, combined
with northeasterly upslope is responsible for the showers along
the rocky mountain front. All of this activity will continue to
drift slowly sse into central montana through this evening. Gusty
winds may be possible in the vicinity of some of the stronger
showers or thunderstorms. The large scale upper level ridge axis
drifts over the forecast area Monday and Tuesday, providing mainly
dry and warmer conditions, except for isolated mountain showers.

Pn
Tuesday night through Sunday... An upper-level ridge of high pressure
will be over the region Tuesday night into Wednesday, resulting in
fair weather for most. Just a few showers and thunderstorms are
possible over and near higher terrain Tuesday evening and again
Wednesday afternoon evening. The ec and GFS are in good agreement
that a pacific disturbance will then overspread our area Thursday
into Friday, resulting in a somewhat higher potential for scattered
showers and thunderstorms. The aforementioned models then disagree
on the timing of additional shortwaves for the upcoming weekend.

However, the potential of scattered showers and thunderstorms should
persist. Temperatures look to be above normal through the extended
period, with Wednesday likely being the warmest day.

Brusda jaszka

Preliminary point temps pops
Gtf 45 71 46 79 20 0 0 0
ctb 44 71 43 77 10 0 0 0
hln 48 75 49 82 20 0 0 0
bzn 43 72 43 79 20 0 0 0
wey 36 63 34 70 30 10 10 20
dln 44 72 45 78 10 0 0 10
hvr 41 71 41 79 0 0 0 0
lwt 41 67 41 73 0 0 0 0

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 mi1.8 hrsSSE 1010.00 miMostly Cloudy58°F43°F58%1021.9 hPa

Wind History from BZN (wind in knots)
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Last 24hrSE3SE7SE8SE6SE7SE6SE4E4SE4CalmCalmCalmCalmCalm--CalmCalmNW11
G17
NW11N8N8S7SE10SE4
1 day agoSE8SE5SE7SE7SE7SE6SE7SE4S3CalmCalmCalmNW7N6Calm4W65W7NW6CalmSE3SE7S8
2 days agoW3SW4SE3SE4E5SE5SE4SE53CalmN3N5CalmW7CalmNW7CalmSE6N7SE8SE8W10W11SE4

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 (1,6,7,8)
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Ground Weather Radar Station Billings, MT
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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.