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  1. #1776
    Join Date
    Feb 2017
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    Seattle
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    138
    Quote Originally Posted by DBerd View Post
    When you drop a large cornice all bets are off and I doubt there's all that much correlation between avi conditions and cornice stability. Similar event triggered the 30'?! deep slide on Ruby Mtn a couple years back.
    Yeah that and snowmobiles. Anything goes when you launch a snowmobile 40 ft onto a slab.

  2. #1777
    Join Date
    Dec 2010
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    1,006
    Interesting phenomenon. That area had seen quite a bit of skier compaction this winter as its a really popular slackcountry spot, right? Yet, none of those skiers had triggered the slide on that early season layer, even when the pack was much shallower and wouldnt have supported their weight as much. Not to mention, how did the literal feet of rain that fell on that snow not destroy/crush/melt/bond that surface layer it slid on? Snow is weird. It'll be interesting to see the NWAC report when it comes out.

  3. #1778
    Join Date
    Jan 2005
    Location
    Keep Tacoma Feared
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    630
    Here's the telementry for White Pass last Friday night/Saturday am, when they got their last significant snowfall:

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    100 mph gusts and 50+ mph sustained winds, combined with heavy precip with below 32 F temps. The slope that slid is the wind loaded side of the crest. All this occurred after the last major rain event there and I believe it has not rained there since last Friday afternoon (you can see the 33 F in the telementry for when the rain switched to snow there). Seems like a perfect recipe for a slab to form and sit multiple days before releasing on the last rain crust.

  4. #1779
    Join Date
    Dec 2010
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    1,006
    Quote Originally Posted by altasnob View Post
    Here's the telementry for White Pass last Friday night/Saturday am, when they got their last significant snowfall:

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    100 mph gusts and 50+ mph sustained winds, combined with heavy precip with below 32 F temps. The slope that slid is the wind loaded side of the crest. All this occurred after the last major rain event there and I believe it has not rained there since last Friday afternoon (you can see the 33 F in the telementry for when the rain switched to snow there). Seems like a perfect recipe for a slab to form and sit multiple days before releasing on the last rain crust.
    Not trying to argue, just trying to understand.

    The quick writeup on NWAC makes it seem like the slide ripped all the way to the ground, not on a recent raincrust. I wouldnt questions a recent slab forming and sliding, but it seems crazy to think that after all the rain events and heavy loading of the winter, the entire snowpack would release to the ground where apparently no real bond had formed.

  5. #1780
    Join Date
    Dec 2003
    Location
    Seattle
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    30,805
    Quote Originally Posted by californiagrown View Post
    Not trying to argue, just trying to understand.

    The quick writeup on NWAC makes it seem like the slide ripped all the way to the ground, not on a recent raincrust. I wouldnt questions a recent slab forming and sliding, but it seems crazy to think that after all the rain events and heavy loading of the winter, the entire snowpack would release to the ground where apparently no real bond had formed.
    See the Hudge Campbell Basin Slide.

    Put enough force in on a steep enough slope and it will slide. Probably.
    Quote Originally Posted by Downbound Train View Post
    And there will come a day when our ancestors look back...........

  6. #1781
    Join Date
    Dec 2010
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    1,006
    Quote Originally Posted by PNWbrit View Post
    See the Hudge Campbell Basin Slide.

    Put enough force in on a steep enough slope and it will slide. Probably.
    What was the weak layer/explanation for that one? Was it a recent rain event that percolated down but the liquid became trapped or something? Plus, a large, aggressive amount of bombing of course.

  7. #1782
    Join Date
    Aug 2017
    Location
    North Bend, WA
    Posts
    683
    The groomers are fast and chalky with some soft spots. The only off piste I've tried was super icey, and I've only heard reports of the same. Maybe it will soften up but it is still mainly cloudy and will get only more so.

    The mountain seems filled with those of a greyier and older variety. I guess that's the norm midweek.

    Sent from my SM-G973U using TGR Forums mobile app

  8. #1783
    Join Date
    Dec 2003
    Location
    Seattle
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    30,805
    Quote Originally Posted by californiagrown View Post
    What was the weak layer/explanation for that one? Was it a recent rain event that percolated down but the liquid became trapped or something? Plus, a large, aggressive amount of bombing of course.
    NWAC's take

    "The ski patrol at Crystal Mountain on Sunday and Monday produced consistent deep wet slab releases with large explosive charges releasing to deep layers from early this winter. These avalanches were generally on N to E slopes at about 6-7000 feet with crowns of 4 to 6 feet and up to 10 feet in spots with the High Campbell chair and some trees destroyed. See photos at the Crystal Mountain web site. They also reported similar natural releases were seen in the adjacent Mt Rainier National Park.

    On Tuesday 11 March, NWAC observer Dallas Glass also found recent very large wet slab releases on Kendall Peak at Snoqualmie Pass. Several wet slab avalanches began at about the 5500 ft elevation on primarily W aspects on slopes of about 35-40 degrees. They were classified as D 2.5, R 2/3 natural wet slabs and ran about 1000 feet. These slides likely released Saturday when the area received over 3 inches of rain to elevations above 5500 feet. A video of the slide area and debris fields can be seen here NWAC channel.

    While it is unlikely these deep wet slab avalanches could be human triggered, it remains a possibility, especially if initiated by a thin spot in the slab such as near rocks or trees. As liquid water has now penetrated to deep in the snowpack in places that have received significant recent rain these concerns should remain into the spring, especially during times of rain or extended warm periods. It may also be possible to initiate a wet slab release via a loose wet avalanche triggering a deeper layer. As a result of this recent activity, wet slab avalanches will now be listed as a concern near and west of the crest."

    https://www.nwac.us/avalanche-foreca...e-pass/#photos

    And this is the Forecast for the time of the accident.
    Quote Originally Posted by Downbound Train View Post
    And there will come a day when our ancestors look back...........

  9. #1784
    Join Date
    May 2017
    Location
    Puget Oceania
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    408
    Quote Originally Posted by PNWbrit View Post
    As liquid water has now penetrated to deep in the snowpack in places that have received significant recent rain these concerns should remain into the spring, especially during times of rain or extended warm periods.
    I.e., functioning much like storm-induced landslides, whereas the first rain event is setting the table for subsequent rain events.
    Chronic Complainer Experiencing Ikon Cognitive Dissonance Since 2018

  10. #1785
    Join Date
    Oct 2003
    Posts
    1,013
    I triggered a ~15' foot crown with explosives that looked similar to that. Heavy wind loading, impressive looking crown but tapered fast and not that much debris. Was not really representative of the wider snowpack profile.

  11. #1786
    Join Date
    Oct 2003
    Location
    seattle
    Posts
    515
    Sidenote, and perhaps a longshot - my wife left her beloved Oyuki mittens on the top of the car pulling out of Lot 4 on Sunday. Obviously they didn't make it back down to Seattle. She called Lost & Found, but no dice so far.

    Any chance someone spotted and grabbed those? She was parked at the back of Lot 4. Black and grey Oyuki mittens, look like these: https://usa.oyuki.com/shop/hand-wear/tamashii-gtx-mitt

    Longshot, but if someone happened to pick them up, would make her day.

  12. #1787
    Join Date
    Jan 2008
    Posts
    716
    Quote Originally Posted by 3pin View Post
    Sidenote, and perhaps a longshot - my wife left her beloved Oyuki mittens on the top of the car pulling out of Lot 4 on Sunday. Obviously they didn't make it back down to Seattle. She called Lost & Found, but no dice so far.

    Any chance someone spotted and grabbed those? She was parked at the back of Lot 4. Black and grey Oyuki mittens, look like these: https://usa.oyuki.com/shop/hand-wear/tamashii-gtx-mitt

    Longshot, but if someone happened to pick them up, would make her day.
    Mittens and gloves are typically spotted sans mates. And if a confirmed pair were spotted the likelihood of that pair being the correct size would be too low to warrant making a worthwhile effort to pick them up. My opinion of course.

  13. #1788
    Join Date
    Feb 2013
    Location
    Highyak
    Posts
    510
    After light snowfall this morning and a nice break in the weather around lunch time, it would appear that Old Man Winter has flipped the switch for the Sunday night sesh.

    Free refills anyone?
    "Pay your nickel and take your chances"
    "they don't groom Alpental, they just move shit around."

  14. #1789
    Join Date
    Apr 2010
    Location
    Under a bridge in YakTown waiting for the shuttle to Nachos
    Posts
    695
    The 4 one 0 is washed out, blocking access to of our favorite zones, so we went to the high 12. Not sure why the snow report said 3", it was more like 12". Stood in some long lines and pondered why snowboarders lack the ability to count to 4. Bailed and went for a long walk. Lapped bottomless in the lower trees that always seem to deliver. Generally stable, but a little more reactive in late afternoon after the wind and snow picked up. Some sluffiness was managed.





    Picking up a pair of protests for the wife might have been one of my better life choices. Fits her skiing style wonderfully.



    Breaking trail was a rather unpleasant suffer fest at times.


  15. #1790
    Join Date
    Jan 2008
    Posts
    716
    Sneaker pow day at Mission. My personal favorite.

  16. #1791
    Join Date
    Oct 2003
    Location
    Lapping the pow with the GSA in the PNW
    Posts
    3,238
    Stevens was stellar today. Hardly anyone there and deep, light snow everywhere. So glad everyone goes somewhere else when mid-winter break/Presidentís Day rolls around. We even saw the sun. Click image for larger version. 

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    In constant pursuit of the perfect slarve...

  17. #1792
    Join Date
    Oct 2003
    Location
    Church of the Nifty Blue Chrysler
    Posts
    5,433
    It was a little crowded, but the last two days at Alpental were stellar. No complaints. Deep and spongy on a soft base.
    Set my compass North, I got Winter in my blood.

  18. #1793
    Join Date
    Oct 2008
    Location
    Wenatchee
    Posts
    7,771
    No chatter about the three skiers buried above Skyline lake this weekend? Same party.

  19. #1794
    Join Date
    Feb 2013
    Location
    Methow Valley
    Posts
    892
    I saw some mention of it on the Turns-all-year facebook group. Sounded like 2 full burials who were able to clear their airspaces and one partial. The guy partially buried was able to dig himself out and then dig out his buddies. They estimated total burial time was around 45 minutes.

  20. #1795
    Join Date
    Feb 2013
    Location
    Highyak
    Posts
    510
    Mediocre Tuesday

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    "Pay your nickel and take your chances"
    "they don't groom Alpental, they just move shit around."

  21. #1796
    Join Date
    Jan 2008
    Posts
    716
    Click image for larger version. 

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  22. #1797
    Join Date
    Sep 2009
    Location
    PNW
    Posts
    5,146
    PE, Mechanical Engineering
    University of Bridger Bowl Alumnus
    Alpental Creeper

  23. #1798
    Join Date
    Feb 2008
    Location
    In a parallel universe
    Posts
    4,786
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  24. #1799
    Join Date
    Oct 2003
    Location
    Seattle
    Posts
    4,625
    This is the happiest day of ACH's life........ every time!

  25. #1800
    Join Date
    Sep 2018
    Posts
    976
    Quote Originally Posted by ACH View Post
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    Nice form H!

    Sent from my I3123 using Tapatalk

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