Friday, April3, 2020
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Marine Weather and Tides
Big Sky, MT

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 6:57AMSunset 7:57PM Friday April 3, 2020 6:07 PM MDT (00:07 UTC) Moonrise 1:26PMMoonset 3:57AM Illumination 83% Phase: Waxing Gibbous; Moon at 11 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 032308 AFDTFX

Area Forecast Discussion National Weather Service Great Falls MT 507 PM MDT Fri Apr 3 2020

. Updated Aviation Discussion .

SYNOPSIS.

A weather disturbance will move through the area tonight, producing some light snow. It becomes partly cloudy by Saturday afternoon, but another round of light snow will affect the western portions of the region on Sunday. We will have a slow warming trend through the middle of next week, before another round of colder air moves back into the area by next Friday.

DISCUSSION.

Tonight through Saturday night . Upper level disturbance will continue to push from west to east tonight across the region. This will bring scattered snow showers to the region, mainly north of I-90 across central and northern portions. The best concentration of these showers look to come along the Rocky Mountain Front and from Helena to Great Falls to Lewistown. Overall accumulations in the lower elevations will be an inch or less with 1 to 4 inches at the mountains. Given quick nature of this system, low snow totals, and time have held off on any highlights for the time period. For those outdoors or traveling should prepare for winter conditions at times. Winds may also briefly become breezy as this disturbance passes. This disturbance moves eastward early Saturday morning with showers diminishing quickly. The remainder of Saturday looks to be mainly dry with continued below average temperatures underneath weak ridging. This ridge starts to break down overnight Saturday night with perhaps some more scattered snow showers returning by early Sunday morning. Temperatures also appear to improve slightly to near normal temperatures for Saturday night. Anglin

Sunday through next Friday . Expecting a fairly complicated pattern next week as a potent low diving south along the West Coast becomes cut off from the polar jet and meanders over or just offshore the Southwest US. We start the period in SW flow with a short-wave trough moving across the CWA on Sun. Models are not very enthusiastic on moisture with this system, so POPs and QPF were kept fairly low outside of the mountains. A shortwave trough in the polar jet then dives across Montana later Mon into Tues, which may help draw some enhanced moisture northward from the cut- off low and toward the state. For now Chance to Likely POPs were kept in SW MT, with QPF generally kept south of MT-200. Some instability may accompany this surge in moisture, with ensemble mean CAPE around 150 J/kg, so a chance of thunderstorms was put in across SW MT Mon afternoon and evening. From Tuesday onward, there isn't much agreement among models on the overall pattern or the next chance of precip, so POPs were kept on the low side. Temps are forecast to rebound back toward or above normal from mid-week onward, but much of this will depend on the exact details of the upper-level pattern, including what becomes of the cut-off low over the Southwest. -Kredensor

AVIATION.

Updated 507 PM MDT Fri Apr 3 2020 (04/00Z TAF Period)

Isolated to scattered convective snow showers can be expected near or over most terminals through about 06z-08z, with the threat lasting longest into the night at KHVR, KLWT, and KHLN. Gusty winds and MVFR/IFR conditions are possible briefly with this activity, though gusty winds become increasingly less likely as the nighttime inversion sets in by 02z-03z this evening. Conditions overall then improve Saturday morning, although some lingering low clouds are possible. Mountain obscuration is possible at times through the forecast period.

PRELIMINARY POINT TEMPS/POPS. GTF 22 40 24 49 / 30 10 0 20 CTB 17 34 21 40 / 30 10 0 30 HLN 25 45 25 54 / 50 20 10 20 BZN 25 45 27 53 / 20 10 10 10 WYS 16 36 19 43 / 30 10 30 30 DLN 23 45 27 49 / 20 0 0 10 HVR 23 37 22 47 / 30 10 0 20 LWT 24 37 23 49 / 40 20 0 30

TFX WATCHES/WARNINGS/ADVISORIES. None.

http://www.weather.gov/greatfalls


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Bozeman, Gallatin Field, MT38 mi71 minSSW 1510.00 miFair41°F16°F36%1014.3 hPa

Link to 5 minute data for KBZN

Wind History from BZN (wind in knots)
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Last 24hr--SE6SE6SE6S8SE6SE6S6SE6SE9SE5SE7CalmE3SE6S4CalmCalmSW16W11SW16
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1 day agoS6W8SE9CalmNW13NW10N8NW5W7W6W6CalmSE8SE9SE4CalmCalmSE6SE6SE6S5--4--
2 days agoCalmN12NW5CalmCalmN9CalmW6NW5W7W8W6Calm3CalmN3CalmCalmCalmCalmCalmCalmCalmCalm

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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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 (20,4,5,8)
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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 numerous 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.