Overnight a rapid loading event accompanied by strong Easterly winds has deposited over 24″ of new snow in the alpine and another 12-15″ is expected today. This snow has fallen on a weak pre-existing surface and large natural avalanche activity is very likely today and could easily run to the valley floor of Turnagain Pass. HUMAN TRIGGERED AVALANCHES up to 4’ thick WILL BE LIKELY on slopes steeper than 30 degrees. It will be extra important to give steep slide paths, like Seattle Ridge, a lot of space today. Do not put yourself in the way of a run out zone.
Wind Slabs: Natural wind slab avalanches up to 4’ thick are expected in the alpine elevations and could easily run the entire slide path. Yesterday wind loading was observed at all elevations and wind directions were confusing at lower elevations. Expect wind slabs to have formed on all aspects and elevations.
Storm Slabs: In areas protected from the wind, storm slabs up to 2’ thick could be easily triggered on steep terrain features and will be large enough to bury a person. Keep slope angles less than 30° and stay away from terrain traps.
Loose Snow: Sluffs due to heavy snowfall likely occurred last night and again will be likely today. These have the ability to trigger a slab avalanche on their way down.
Snowstake at Turnagain Pass over a 12 hour period shows over 2 feet of drifted snow.
Yesterday strong NE winds were observed at the beginning of the storm at mid to low elevations throughout Turnagain Pass
Cornice formations are extremely large and have received significant loading overnight. Natural cornice fall activity is anticipated today and will be an additional trigger of large natural avalanches.
Glide Cracks litter Turnagain Pass between 1000’ to 2500’ and have received an additional load of snow overnight. These unpredictable hazards may release without warning today and could run further than expected. This is an additional reason to avoid being near a runout zone.
Yesterday moderate Easterly ridgetop winds became strong in the afternoon with sustained speeds averaging in the 40’s mph and gusts in the 60’s mph. Over 24″ of new snow fell in the upper elevations and around 16″ along the road corridor. Temperatures have remained below freezing along Turnagain Pass (1000′) and rain/snow line is near 400′.
Today an additional 12-15″ of new snow is expected throughout the day, 1.0-1.25″ of snow water equivalent. Strong Easterly ridgetop winds will remain in the 30-40’s mph decreasing by late afternoon. Temperatures are expected to remain just below freezing at 1000′, but rain can be expected at sea level today.
By this evening winds and precipitation will decrease and temperatures will also cool slightly.
|Temp Avg (F)||Snow (in)||Water (in)||Snow Depth (in)|
|Center Ridge (1880′)||30||23||2.0||123|
|Summit Lake (1400′)||32||11||0.5||41|
|Alyeska Mid (1700′)||31||21||1.92||105|
|Temp Avg (F)||Wind Dir||Wind Avg (mph)||Wind Gust (mph)|
|Seattle Ridge (2400′)||26||SE||26||58|
|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|
|04/02/21||Turnagain||Observation: Seattle Ridge||Wagner / Schauer Forecaster|
|04/01/21||Turnagain||Observation: Pete’s||Schauer/ Cullen Forecaster|
|03/31/21||Turnagain||Observation: Tincan||Schauer/ Rothman 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.