Thursday, December12, 2019
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Marine Weather and Tides
Woods Bay, MT

Version 3.4
NOTICE
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.
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 8:16AMSunset 4:45PM Thursday December 12, 2019 3:29 PM MST (22:29 UTC) Moonrise 5:23PMMoonset 8:40AM Illumination 99% Phase: Waning Gibbous; Moon at 16 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 Woods Bay, MT
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location: 48.04, -114     debug


Area Discussion for - Missoula, MT
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FXUS65 KMSO 122116 AFDMSO

Area Forecast Discussion National Weather Service Missoula MT 216 PM MST Thu Dec 12 2019

DISCUSSION. Mountain induced convective snow showers continue this afternoon as the Northern Rockies remain in a generally moist and unstable westerly flow. Shower activity will continue through the early evening, with most of the precipitation falling across the higher terrain. Moderate snowfall will periodically fall across Lookout, Lolo, Lost Trail, and Marias passes through the evening.

A second round of widespread precipitation is expected tonight into Friday morning across the Northern Rockies as a cold front moves through the region. A period of moderate to heavy snowfall impact all mountain passes along the ID/MT border and Marias Pass along the Continental Divide this evening as the front moves in. Vertical profiles of the atmosphere along the leading edge of the cold front suggest a brief period of intense snowfall is possible between 7 and 10 pm tonight for Lookout and Lolo passes. Snowfall rates could briefly reach 2 inches per hour across the higher terrain and pass areas as the front moves through. Travel will be difficult at this tonight across mountain passes as another 6-12 inches is expected by Friday morning for Lolo, Lookout, and Marias passes.

Confidence continues to increase for an area of low pressure to track across northeastern Washington into northwest Montana tonight. A broad band of moderate snowfall will develop across Kootenai/Cabinet and Flathead/Mission valley regions with 2-5 inches of snow expected by Friday morning commute. Given the increased confidence in widespread valley snow across northwest Montana, Winter Weather Advisories have been posted. Model guidance also suggests the potential for snow bands late tonight into Friday morning across the Missoula and Bitterroot valleys as well as the I-90 corridor west and east of Missoula. Given the variability of the snow bands, snowfall accumulations are remain uncertain, but anywhere from a trace to 2 inches of snow is possible.

Flow over the Northern Rockies will become northwest from Friday evening through Sunday night, with disturbances moving through the flow. The northwest orientation of wind at the ridgetops and cold air aloft favor episodic bands of light snow to develop at times, particularly across west central Montana (including I-90 Lookout Pass to Drummond and Highway 93 Arlee to Stevensville). Mountain pass roadways, such as Lookout, Lolo, Lost Trail, and Marias, are likely to have continuous snow during this time and remain snow covered. There is a question of how impactful the northwest flow snow scenario will be for travel corridors outside of the mountain passes and the picture is still a bit unclear and will likely change over short periods. What does this mean if you’re traveling around the Northern Rockies this weekend? It will be a safe assumption that all roadways may be icy (particularly overnight through morning periods) and that extra time will be necessary to reach your destination safely. Northwest flow can sometimes lead to surprisingly high snow accumulations over a short duration, so we’ll be watching this scenario closely. Also, warming aloft overnight Sunday into Monday may be enough to change some snow back to freezing rain for valleys in the 2000 to 4000 feet range. The freezing rain may add yet another layer of complexity on an already complex forecast and assessment of weather impacts, however confidence is low at the moment.

A ridge of high pressure is expected to build and intensify over the west coast of the US Monday through Thursday, transitioning the Northern Rockies from snow/freezing rain potential to widespread valley freezing fog scenario. The European weather model suggests that tremendous warming aloft will take place on Tuesday, cutting off cold valley air from the warming high terrain. Considering the length time that the high pressure is over the Northern Rockies, a stagnant airmass may take hold for the region. If the European weather model (one of the most aggressive models depicting this high pressure pattern, lasting through Saturday next weekend) is correctly depicting the high pressure longevity overhead, then air quality could be impacted for most populated areas around the region.

AVIATION. Mountain induced snow shower activity will keep terrain obscurations in place through the rest of the afternoon. A cold front will bring another round of snowfall across the Northern Rockies tonight into Friday. A band of moderate snowfall will spread across MSO, GPI, and SMN beginning around 13/0300z. Brief periods of LIFR visibility will be possible at these TAF sites between 13/0300z and 13/0600z. Snow showers will continue through the morning hours at MSO, GPI, and SMN with periodic periods of IFR visibility being possible. BTM could see brief periods of MVFR/IFR visibility from snow showers between 13/0600z to 13/1200z.

MSO WATCHES/WARNINGS/ADVISORIES. MT . Winter Weather Advisory until 11 AM MST Friday Bitterroot/Sapphire Mountains.

Winter Weather Advisory until 11 AM MST Friday Lower Clark Fork Region.

Winter Weather Advisory from 8 PM this evening to 11 AM MST Friday Flathead/Mission Valleys.

Winter Weather Advisory until 11 AM MST Friday West Glacier Region.

Winter Weather Advisory from 5 PM this afternoon to 11 AM MST Friday Kootenai/Cabinet Region.

Winter Weather Advisory from 8 PM this evening to 11 AM MST Friday Potomac/Seeley Lake Region.

ID . Winter Weather Advisory until 10 AM PST Friday Northern Clearwater Mountains . Southern Clearwater Mountains.

Winter Weather Advisory until 11 AM MST Friday Western Lemhi County.




Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kalispell, Glacier Park International Airport, MT23 mi2.6 hrsSSW 1010.00 miOvercast41°F30°F65%1012.9 hPa

Link to 5 minute data for KGPI

Wind History from GPI (wind in knots)
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Last 24hrS5S5CalmCalmN3CalmCalmN3W3N3--CalmSW4SW5SW4SW6S6SW6S7S8SE15SE12SW10
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1 day agoCalm3N3CalmCalmCalmW3CalmN3W3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmS4CalmCalm
2 days agoCalmCalmCalmCalmCalmCalmCalmCalmW3CalmCalmCalmCalmCalmCalmCalmCalmCalmSW3CalmCalmCalmCalmCalm

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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wmap_P
GEOS 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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Missoula, MT (17,4,5,8)
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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.