We have had very little snow so far in our upcoming week of stormy weather, but the snowpack is already showing its cards. Two shallow wind slabs were triggered yesterday by skiers/riders on Tincan and Eddies. These slabs were only 4-6″ thick, but are so touchy because they are sitting on VERY weak faceted snow. With another 2″ of new snow overnight and continued winds, we can expect today’s wind slabs to be a bit thicker – and just as touchy.
What to watch for today:
Remember safe travel protocol: expose one person at a time, have an escape route planned, group up in safe zones and be aware of groups around you.
Photo below from Adam Rothman showing the shallow wind slab on Tincan. This is a classic slope for wind slab avalanches. Keep in mind, it has likely reloaded and could be ready for another release.
So what about this snowpack???
“This is a great layer for making avalanches.” Quote from Jim Kennedy, former Alyeska Snow Safety Director and current Alaska DOT Avalanche Program Director.
What Jim is talking about is the snow surface from our two-week cold and dry spell, shown in the video below. Faceted snow is notorious for causing avalanches once it is buried – this is the EXACT set-up we have now. With only 3-7″ of new snow causing low volume avalanches now, this is a pre-cursor to what is to come with additional snow in the forecast for tomorrow.
Yesterday saw mostly cloudy skies with a few snow flurries. Ridgetop winds bumped up and averaged in the 20-25mph range with gusts to 51mph from a Southerly direction. Temperatures warmed to 36F at sea level (ugh….), to the upper 20’s at 1,000′ and low 20’sF on the ridgetops.
Overnight around 2″ of moist snow fell above 300′ with light rain/drizzle falling at sea level. The rain/snow line looks to be around 200-300′. Snow amounts overnight for Portage Valley and the higher elevations could be in the 4-6″ range. Today we should see cloudy skies and intermittent snow showers. Snowfall amounts during the day are expected to be anywhere from 0-2 inches. Ridgetop winds will be 5-10mph from a Southerly direction. Temperatures are expected to remain warm with a rain/snow line right around sea level.
The BIG news is how tomorrow’s storm is going to shape up. We are expecting winds in the 50-60mph range and snowfall in the 6″ to 1 foot range. Stay tuned on tomorrow’s advisory!!
|Temp Avg (F)||Snow (in)||Water (in)||Snow Depth (in)|
|Center Ridge (1880′)||28||2||0.2||23|
|Summit Lake (1400′)||29||0||0||9|
|Alyeska Mid (1700′)||29||2||0.25||14|
|Temp Avg (F)||Wind Dir||Wind Avg (mph)||Wind Gust (mph)|
|Seattle Ridge (2400′)||23||22||SE||48|
|12/08/22||Turnagain||Observation: Magnum: Super Bowl/PMS Bowl||Schauer/ Wadsworth Forecaster|
|12/07/22||Turnagain||Avalanche: Tincan||John Sykes|
|12/07/22||Turnagain||Observation: Eddies skintrack||Iris Neary|
|12/06/22||Turnagain||Observation: Seattle Ridge- Main Bowl||Schauer/ Creighton Forecaster|
|12/04/22||Turnagain||Observation: Silvertip||Schauer/ Cullen Forecaster|
|12/04/22||Turnagain||Observation: Kickstep Glacier||Moderow / Wadsworth|
|12/03/22||Turnagain||Observation: Seattle Ridge||AS/ AR/MS/ME Forecaster|
|12/03/22||Turnagain||Observation: Seattle Ridge||Kakiko Ramos-Leon|
|12/03/22||Turnagain||Observation: Superbowl||Peter Wadsworth|
|12/02/22||Turnagain||Avalanche: Magnum/Cornbiscuit||John Sykes Forecaster|
Status of riding areas across the Chugach NF is managed by the Glacier and Seward Ranger Districts, not avalanche center staff. Riding area information is posted as a public service to our users and updated based on snow depth and snow density to prevent resource damage at trailhead locations. Riding area questions contact: firstname.lastname@example.org
|Area||Status||Weather & Riding Conditions|
This is a general backcountry avalanche advisory issued for Turnagain Arm with Turnagain Pass as the core advisory area. This advisory does not apply to highways, railroads or operating ski areas.