Turnagain Pass

The weak snow that formed in early December sitting over the Thanksgiving Rain Crust or old hard snow is now buried under 2-4′ of snow. This combination is our current cause for concern and heightened caution in the backcountry. Many large avalanches ran during the storm Saturday. The crowns were long and connected, indicative of a persistent slab problem. Smaller human and cornice triggered avalanches have also run on these buried weak layers during the past few days on Turnagain Pass and in Summit Lake. Yesterday we received reports of a snowmachine triggered avalanche up Lynx Creek (possibly remotely triggered) and shooting cracks from snowmachines up towards Johnson Pass proper. These are both signs that the snowpack is still reactive. Many people have gotten out into steep terrain with no issues but these conditions warrant continued respect. These slides may be harder to trigger but very dangerous if you happen to hit the wrong spot. Being very careful to not overload the slope is crucial. Multiple sleds or skier/riders in or under avalanche terrain should be avoided. This type of avalanche often can be triggered from shallower areas where weight can transfer to the weak layer more easily. Pay attention to slopes above you and look for signs of instability. 

Silvertip Creek: Long continuous crown at top of ridge extending out of sight from our perspective. 1-2 miles long? Photo: Joe Connelly

There are multiple additional concerns to look out for today. Mostly clear skies should provide good visibility.

CORNICES: Cornices grew during the recent storm and as always travel on top of these should be avoided. They often break further back than expected and can trigger avalanches on the slopes below. Be careful not to accidently drive your snowmachine out onto them or have your ski lunch break in the wrong spot.

WIND SLABS: There was a lot of snow moved around by the wind during the storm. Stiff, pillowed, sculpted snow may indicate old wind slab that is still possible to trigger. Listen for hollow sounds and look for shooting cracks.

LOOSE SNOW:  The surface conditions have become less cohesive during the cold snap, loose snow avalanches are likely in very steep and rocky terrain. They may not be big enough to bury you but could be hazardous if they push you off of a cliff, flush you through rocky areas or into terrain traps.