Friday, August18, 2017

Marine Weather and Tides
Big Sky, 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 6:28AMSunset 8:27PM Friday August 18, 2017 9:46 PM MDT (03:46 UTC) Moonrise 1:58AMMoonset 5:18PM Illumination 10% 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 190340
area forecast discussion
national weather service great falls mt
940 pm mdt Fri aug 18 2017

Mid level shortwave is progressing east across NW and n-central
mt this evening with satellite imagery showing band of mid-level
cloud-cover and embedded wave clouds along it. Main impact this
evening however, continues to be smoke from fires near and west of
the continental divide streaming east across central and SW mt in
enhanced westerly flow ahead of the shortwave. As flow aloft
veers to more west-northwesterly tonight some improvement is
possible over n-central mt, though smoke will probably linger
across SW mt into Saturday morning. Surface frontal boundary and
wind shift to the north currently approaching calgary ab, should
reach the mt ab border around 6am, continuing south through
n-central mt Saturday morning. Until then, expect relative
humidity to remain below 30% with some locations still in the
upper teens, and this combined with breezy west winds will
maintain critical fire weather conditions through much of tonight.


Mild and breezy conditions continue overnight as a dry cold front
moves into northwest montana. Temperatures trend cooler through
the weekend, but the area will remain dry. Wildfire smoke will
also continue hazy skies through the weekend, especially near the
continental divide.

Updated 0000z
mainlyVFR conditions are expected through the forecast
period... However... Some areas may see MVFR conditions due to
reduced visibility in smoke. Area wild fires may bring reduced
vis and haze at times especially from kgtf to khln to kbzn.

Mountain obscuration will also be possible in these areas.

Otherwise expected some high clouds and diminishing winds tonight.

AnotherVFR day is expected for Saturday. A weak front may shift
the winds to a more north to northwest direction Saturday
morning... Continuing into Saturday afternoon. Anglin

Fire weather
The red flag warning remains in effect for all of the tfx fire
weather zones tonight. Critical fire weather conditions have
developed as expected, and are expected to continue tonight
due to low humidity and gusty west winds ahead of a dry cold
front. Active fire behavior is expected overnight in these
conditions. Winds will shift more northwesterly and decrease on
Saturday with less critical afternoon humidity due to the passage
of the cold front.

Additional fire weather highlights are possible again early next
week, as it will remain warm and dry with low humidity and
potentially gusty winds at times.

Prev discussion
Issued 604 pm mdt Fri aug 18 2017
tonight through Sunday... Critical fire weather conditions have
developed this afternoon with low relative humidity and gusty
winds associated with an approaching shortwave trough. Active fire
behavior is expected to continue through the night as detailed
below in the fire weather sub section. Satellite imagery remains
cloud free, except over glacier county where wave cloud activity
is marking the advancing wave. Expect clouds to increase in
coverage overnight. The cold front passes through the forecast
area early Saturday morning. This will produce cooler temperatures
and higher relative humidity, but gusty northwest winds will
continue to support elevated fire weather concerns. Areas of smoke
will persist in valleys along and near the continental divide, and
may even increase in coverage if fires produce more active smoke
plumes. However, smoke should decrease with improving visibility
and air quality in the northwest winds behind the passing front.

Sunday night through Friday... The next shortwave trough is
expected to cross western montana Sunday night into Monday
morning. Forecast models indicate little moisture in the lower
portions of the atmosphere. However, there may be adequate
moisture aloft to support areas of thin mid- to high-clouds
through Monday morning. Should these clouds develop, those seeking
to view the eclipse may encounter periods of obscuration at
times. There remains uncertainty in the timing and extent of cloud
coverage associated with this passing wave. An upper level ridge
will traverse the CWA from west to east Monday night through
Wednesday, resulting in continued warm conditions and primarily
dry weather. Our weather may become slightly cooler and more
unsettled next week Thursday and Friday due to an upper-level
trough digging southward and eastward from british columbia.

Accordingly, the potential of showers and thunderstorms should
increase Thursday and Friday. Low and high temperatures are
expected to be near or slightly above- normal during the period.

The warmest readings will likely occur Tuesday and Wednesday, when
the aforementioned high pressure ridge is firmly overhead. Jaszka

Preliminary point temps pops
Gtf 90 59 84 51 0 0 0 0
ctb 88 54 78 45 0 0 0 0
hln 90 62 88 53 0 0 0 0
bzn 88 52 90 49 0 0 0 0
wey 77 43 81 37 0 0 0 0
dln 85 53 88 46 0 0 0 0
hvr 92 57 82 51 0 0 0 0
lwt 86 56 84 51 0 0 0 10

Tfx watches warnings advisories
Red flag warning until 6 am mdt Saturday central and eastern
lewis and clark national forest areas... Chouteau and fergus
counties... Eastern glacier toole central eastern
pondera liberty... Helena and townsend ranger districts of the
helena national forest... Hill and blaine counties... Lewis and
clark national forest rocky mountain district-rocky mountain
front... Lincoln ranger district of the helena national forest.

Red flag warning until 9 pm mdt Saturday deerlodge western
beaverhead national forest.

Red flag warning from noon to 9 pm mdt Saturday eastern
beaverhead national forest.

Weather.Gov greatfalls

Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Bozeman, Gallatin Field, MT38 mi50 minS 610.00 miSmoke71°F36°F28%1011.8 hPa

Wind History from BZN (wind in knots)
Last 24hrS10S7S8SE6SE7SE5SE6CalmSE5SE4E4SE3SE3CalmNE4W4--N5CalmN4NE5CalmSE5S6
1 day agoNW4N4S4S5SE6S5S6CalmS5SE6SE6SE4CalmW534N6NW10
2 days agoSE5SW6E4SE10SE9S6SE7SE7CalmSE5SE3CalmCalmCalm3Calm43NW7N6

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 Great Falls, MT (23,6,7,8)
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Ground Weather Radar Station Billings, MT
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weather_mapweather_map weather_map

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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.