Saturday, February23, 2019 L-36.com


Marine Weather and Tides
Missoula, MT

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 7:24AMSunset 6:13PM Saturday February 23, 2019 1:39 PM MST (20:39 UTC) Moonrise 11:34PMMoonset 9:54AM Illumination 80% Phase: Waning Gibbous; Moon at 19 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 Missoula, MT
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location: 46.87, -114.01     debug


Area Discussion for - Missoula, MT
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Fxus65 kmso 231453
afdmso
area forecast discussion
national weather service missoula mt
753 am mst Sat feb 23 2019

Update Issued winter weather advisory for parts of NW mt.

Discussion Snow recently intensified at kgpi and infrared
satellite imagery shows a band of rapidly cooling cloud tops over
northwest montana with rapid pressure rises (10 hpa per 3 hrs)
east of the continental divide. This all supports faster timing
and a somewhat more intense arrival of the arctic front for
northwest montana, so we issued an advisory.

This will come in with three phases. The first will be moderate
snow covering roads followed by a blast of cold air causing
blowing snow generally around noon. As the temperatures fall snow
impacts will decrease but wind chills 10 to 20 degrees below zero
will be a concern until tomorrow.

Aviation Snow will be present at times across the northern
rockies air space during the next 24 hours. Strong westerly flow
aloft will prevent much of the snow from reaching valley floors
for very long, however instances of reduced ceiling and visibility
will be found at kgpi, kmso, and ksmn throughout today. Another
rush of cold air from east of the continental divide will arrive
at kgpi near 23 1700z, with northeast winds gusting to 25 knots
combined with intermittent snow thereafter through sunset. Terrain
obscurations will be common, particularly near kmso southward,
where the bulk of snow activity will be occurring during the next
few days.

Prev discussion issued 422 am mst Sat feb 23 2019

Extended period of snow accumulation across the northern
rockies today through Tuesday...

discussion...

strong and relatively moist westerly flow aloft will present over
the northern rockies through the next several days, with varying
snow expectations over time. The westerly flow today will inhibit
a lot of the snow from reaching valley floors, however quick
bursts of snow will overcome the westerly (downsloping) winds at
times. Snow accumulations will be most pronounced today over high
terrain, with mountain passes experiencing highly variable road
and weather conditions throughout today and tonight. Also, another
gusty blast of cold air from east of the continental divide is
anticipated to reach kalispell later this morning and spread
throughout western montana through midday Sunday.

The pattern shifts a bit over the northern rockies Sunday
afternoon through Monday afternoon, with a slight warm front look
to the flow aloft. This pattern shift is expected to bring high
elevation snow measured in excess of a foot over the clearwater
mountains and along the bitterroot crest (on the montana-idaho
border). Lower elevations of north central idaho, including the
camas prairie, will see snow accumulation in the 4 to 8 inch
range. Expect some difficult driving conditions over mountain
passes, including low visibility, snow, and blowing snow. The
relatively warm, moist flow over the impinging cold easterly winds
within area valleys of western montana will yield some
interesting results, with a mix of periodic snowfall and some
blowing snow. Accumulations in the 4 to 8 inch range appear
likely for low elevations along and south of the i-90 corridor in
western montana, while far northwest montana (including
kalispell) is anticipated to have accumulation of up to around 1
inch. All in all, the combination of snow accumulation, blowing
snow, low visibility, and poor traction will create a sustained
travel impact through Monday afternoon.

Tuesday will see a coastal trough deepen into a defined low
pressure circulation off the west coast. Moisture will continue
to be pushed inland, however the cold airmass in-place will begin
to retreat eastward. Tuesday could see widespread 4 to 8” snow
amounts in the valleys of central idaho and west central montana
with up to 20” in the bitterroot mountains from southwest of
missoula up to west of st regis. Northwest montana will see
amounts of 2 to 4".

After Tuesday, there will be a slow warming trend although
surprise surprise, we will most likely not return to seasonally
normal temperatures. There are hints of yet another push of cold
canadian air by the weekend. As far as precipitation, models do
not agree on timing or exact features, they do agree precipitation
will continue through the end of the week albeit with less
accumulation and intensity.

Aviation... Snow will be present at times across the northern
rockies air space during the next 24 hours. Strong westerly flow
aloft will prevent much of the snow from reaching valley floors
for very long, however instances of reduced ceiling and visibility
will be found at kgpi, kmso, and ksmn throughout today. Another
rush of cold air from east of the continental divide will arrive
at kgpi near 23 1700z, with northeast winds gusting to 25 knots
combined with intermittent snow thereafter through sunset. Terrain
obscurations will be common, particularly near kmso southward,
where the bulk of snow activity will be occurring during the next
few days.

Mso watches warnings advisories
Mt... Winter weather advisory until noon mst Sunday flathead mission
valleys... West glacier region.

Id... None.



Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Missoula, Missoula International Airport, MT6 mi46 minNE 32.00 miLight Snow25°F15°F66%1021.3 hPa

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Last 24hrCalmSE3CalmCalmCalmW4S3CalmCalmCalmCalmCalmCalm3W3S4CalmS5E3W3W3NW3W3Calm
1 day agoCalm3SE12SE12SE15SE15E11SE10N7N8N11NE5N6N3N4CalmCalmNE3CalmCalmCalmCalmCalmCalm
2 days ago--CalmCalmCalmS3SW4S3N10N14N15N10
G17
NW10NW10N3CalmCalmCalmN3NW3NW4NE4N3N4Calm

Tide / Current Tables for
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Weather Map and Satellite Images
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GOES Local Image of PacificNorthwest    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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Missoula, MT (15,3,4,5)
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Ground Weather Radar Station Missoula, 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.