The persistent slab problem continues to trend toward less likely, but large high consequence avalanches will result if triggered. Snow pits are showing mixed results now… Sometimes the layers are not reacting. It’s worth keeping in mind that all pit information is overruled by other signs and symptoms. Collapsing, or recent avalanche activity means that the snowpack is inherently unstable, and steeper slopes can slide.
The photo below is from yesterday on Tenderfoot at Summit lake. Click here for a writeup and another photo. The Summit region is often a poor comparison to Turnagain Pass or Girdwood, but right now it represents what any shallower snowpack areas can do. This is another remotely triggered avalanche, one of many in the past week.
Recent snowfall (over 2 feet of wet snow in the last 10 days) has now consolidated into a fairly strong and connected slab. This is good because it is now more difficult for a person’s weight to penetrate that dense layer and collapse the weaker snow at or below the drizzle crust. However, it’s bad because the resulting avalanche when a trigger point is found is now larger and more dangerous. The likelihood of triggering has decreased, but the avalanche size and destructive force has increased.
Trigger points are likely to be shallower wind stripped pockets, possibly close to exposed rocks or trees.
A few inches of snow have accumulated since Tuesday. In general, the weather has not contributed a lot to the avalanche danger since the larger storm on Saturday/Sunday.
Today, mostly cloudy skies are expected. Isolated snow showers are in the forecast today and tomorrow, with little accumulation. Wind should be light. Temperatures continue in the 20s, with a slight decreasing trend on Friday.
Watch for aurora displays tonight if the skies are clear enough. A large solar storm may bring active displays to lower latitudes.
|05/21/22||Turnagain||Avalanche: Magnum, Lipps and Tincan||CNFAIC Staff|
|05/17/22||Turnagain||Avalanche: Sunburst||CNFAIC Staff|
|05/17/22||Turnagain||Observation: Tincan Ridge||Joe Kurtak|
|05/11/22||Turnagain||Avalanche: Cornbiscuit and Magnum west faces||CNFAIC Staff Forecaster|
|05/07/22||Turnagain||Observation: Granddaddy||Kit Barton|
|04/29/22||Turnagain||Observation: Sunburst wx station||AS/ MM/ AM/ NH|
|04/28/22||Turnagain||Observation: More Turnagain Pass/Summit Lake wet slab activity||Alex Marienthal|
|04/27/22||Turnagain||Observation: Magnum||Sykes / Buttrick Forecaster|
|04/27/22||Turnagain||Observation: Girdwood/Summit/Turnagain Road obs||A S|
|04/24/22||Turnagain||Avalanche: Seattle Ridge – large glide avalanche on Repeat Offender path||CNFAIC Staff 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.