Yesterday several skier-triggered and snowmachine-triggered wind slabs were observed in the mid and upper elevation zones following a storm that dumped 12” of new snow in the alpine on Friday. Most of these slides were small, with the exception of a skier triggered wind slab on the North side of Cornbiscuit that was big enough to bury a person. Luckily the terrain allowed the debris to fan out at the bottom and the ski tracks didn’t look like the person was caught. If anyone has info about this avalanche or any others consider sending in an observation, by clicking HERE.
Triggering a wind slab will be possible on slopes steeper than 35° and could easily take you for a ride in undesirable terrain. On solar aspects pay attention to how the sun is warming the surface snow and avoid steep slopes when the surface becomes damp. Active roller balls or water dripping from cornices are obvious signs the snow is becoming unstable. On shaded slopes ease into terrain with caution and avoid terrain with high consequences (terrain traps, rocks, and usupported slopes) where taking a ride could have a poor outcome.
A few other concerns to be aware of:
Loose snow: Don’t be surprised by loose snow sluffing on shaded aspects. Sluffing could be fast moving with the ability to entrain a significant amount of surface snow in big terrain.
Cornice falls: Very large cornice features loom over many ridgeline and have a tendency to break further back than expected. Give them lots of space, and limit time under them.
Skier triggered wind slab on the North side of Cornbiscuit as seen from the Sunburst parkinglot around 1:30pm yesterday.
Snowmachine triggered windslab on West aspect of Seattle Ridge. Photo by Graham Predeger
Skier triggered wet loose avalanche just above the ‘uptrack’ on Seattle Ridge.
There were several new glide avalanches seen yesterday in Turnagain Pass and Girdwood, including a very large glide release on the North side of Eddies and a smaller one on the South side of Sharks Fin. Glide cracks cover all aspects within the mid elevation band and remain a significant threat to popular terrain. This avalanche problem is impossible to predict and is not associated with human triggers. As long as glide cracks continue to open up, move and release, we will stress the importance of avoiding them. AVOIDANCE IS THE ONLY WAY TO MANAGE THIS AVALANCHE PROBLEM.
Recent glide release on the North side of Eddies. Click HERE for more pictures of recent glides.
Natural Wind slab on South Face of Lipps along side a growing glide crack. Photo by Liz Repetto
Yesterday skies were sunny and temperatures reached a high of 44.5F at Center Ridge Weather Station by 12pm.’ Winds were light from the East switching to the West by the afternoon. No precipitation fell yesterday.
Overnight temperatures dropped into the mid 20’s F. Ridgetop winds became East with a sudden increase from Light to Moderate this morning.
Today Easterly ridgetop winds are expected to be light and skies will be mostly sunny. Daytime temperatures could easily reach the high 30’s F to low 40’s F by early afternoon. There may be some valley fog in Turnagain Arm.
Tomorrow looks like another repeat of today; partly cloudy, warm daytime temps, and freezing temperatures overnight. Winds are expected to remain light.
|Temp Avg (F)||Snow (in)||Water (in)||Snow Depth (in)|
|Center Ridge (1880′)||32||0||0||138|
|Summit Lake (1400′)||30||0||0||42|
|Alyeska Mid (1700′)||32||0||0||107|
|Temp Avg (F)||Wind Dir||Wind Avg (mph)||Wind Gust (mph)|
|Seattle Ridge (2400′)||28||Variable||5||30|
|04/16/21||Turnagain||Avalanche: Seattle Ridge||Wendy Wagner Forecaster|
|04/16/21||Turnagain||Avalanche: Turnagain Pass, non-motorized side seen from Seattle Ridge||CNFAIC Staff Forecaster|
|04/15/21||Turnagain||Observation: Tincan||Schauer/ Rothman Forecaster|
|04/13/21||Turnagain||Observation: Turnagain Pass Road Obs||A Schauer Forecaster|
|04/12/21||Turnagain||Observation: Tincan||Johnston-Bloom / Latosuo Forecaster|
|04/10/21||Turnagain||Observation: north sides||lance breeding|
|04/09/21||Turnagain||Observation: Girdwood to Turnagain Road Observations||W Wagner Forecaster|
|04/05/21||Turnagain||Avalanche: Resort bowl Seattle creek head wall||Clint Kyffin|
|04/04/21||Turnagain||Observation: Center Ridge||Andy Moderow|
|04/03/21||Turnagain||Observation: Repeat Offender – Seattle Ridge||Troy Tempel|
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.