Wednesday, August21, 2019 L-36.com


Marine Weather and Tides
Big Sky, MT

Version 3.4
NOTICE
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:30AMSunset 8:24PM Wednesday August 21, 2019 2:58 PM MDT (20:58 UTC) Moonrise 10:25PMMoonset 11:29AM Illumination 63% Phase: Waning Gibbous; Moon at 21 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 212041
afdtfx
area forecast discussion
national weather service great falls mt
241 pm mdt Wed aug 21 2019

Synopsis
A cold front will cross the state tonight through early Friday,
bringing cooler and breezy weather, along with a chance for
showers and a few thunderstorms to many locations. Breezy and
mostly dry conditions are then expected as the weekend approaches,
with cooler than normal temperatures. -cc

Discussion
Rest of this afternoon thru Thursday... High pressure exits to the
east tonight bringing one more mild overnight period with increasing
clouds ahead of an approaching low pressure system with cold front.

Some increase in instability and moisture ahead of the
aforementioned trough will lead to an increasing chance for a few
showers and thunderstorms later this afternoon, primarily along and
northwest of a helena-to-lewistown line. Coverage will initially be
isolated but this will change by late tonight into Thursday morning
as the attendant cold front approaches and eventually passes through
the region. As mentioned above, shower and thunder activity will
mostly be confined to the plains through Wednesday night, but will
likely expand to include area in the southwest and central by
Thursday morning and should persist in to the evening hours.

Rainfall totals are not expected to be very heavy, with most
locations receiving a tenth of an inch or less. Note that there
could be localized areas that receive more. Most of this activity
should diminish by the afternoon hours but conditions will likely
not completely dry out until Thursday evening. Breezy west to
northwesterly winds will be present for much of the CWA following
the frontal passage and high temperatures are expected to take about
a 10 degree tumble from today, with 70s and low 80s expected on
Thursday afternoon.

Friday through next Tuesday... Transient ridging briefly builds
builds in for Friday, before an unsettled westerly flow moves in for
the remainder of the forecast period. Disturbances are expected to
pass through this flow, which will keep temperatures below normal
and will provide daily bouts of breezy to windy westerly winds.

Currently, it appears conditions will remain mostly dry until Monday
and Tuesday when a passing trough shift the general flow to a
slightly more unstable northwesterly direction. -cc

Aviation
Updated 1120 am mdt Wed aug 21 2019 (21 18z tafs)
mostlyVFR conditions are expected for a majority of the TAF period.

Some breezy southeasterly winds are expected to develop over the
plains by mid-afternoon in response to the approaching pacific
trough. A few isolated showers and thunderstorms will be possible
around and after 0z, primarily for kctb, kgtf, and khln, but the
probabilities for thunder are low enough to preclude mention in
the tafs. A cold front associated with a pacific trough is
expected to pass through the region from west to east roughly
between 07z and 15z on Thursday. Expect surface winds to shift to
a more westerly to northwesterly direction in the wake of the
front. There will also be an increase in shower activity near and
behind this front, which may introduce a period of MVFR conditions
at any terminal.

Fire weather
The last of the seasonably warm days for some time today gives way
to a cooler and breezier weather pattern over the coming days.

A weak disturbance may bring isolated dry t-storms to SW mt this pm.

Warmer and drier conditions return wed, along with gusty s-se'ly
breezes. A cold front Wed night into Thu brings some showers and a
few thunderstorms, and a shift to gusty w-nw'ly winds. A wetting
rain appears unlikely for most areas at this time. -cc

Preliminary point temps pops
Gtf 60 78 52 78 30 30 20 0
ctb 56 74 47 77 30 40 30 0
hln 57 79 50 81 20 30 30 0
bzn 52 81 47 82 10 30 30 0
wey 43 78 39 77 0 10 30 0
dln 54 77 45 79 10 30 20 0
hvr 60 83 50 79 20 20 20 0
lwt 56 78 49 74 10 10 30 10

Tfx watches warnings advisories
None.

Http:

Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Bozeman, Gallatin Field, MT38 mi2 hrsENE 410.00 miFair82°F51°F34%1013.1 hPa

Link to 5 minute data for KBZN

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Last 24hr--NE4CalmNE3SE13SE12--------NW10--NW4W5Calm----SW3NE4CalmCalmN6NE4Calm
1 day agoCalmN9NE7E6SE4N6--------S7--S9SE4CalmCalmSE5CalmE4NE4N5SE46NW7
2 days agoN7NW9SE4NE7SE3SE5--------Calm----S6S7NE4--E3CalmE33NE4N5--

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Great Falls, MT (16,3,4,5)
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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.