Turnagain Pass

Sustained moderate winds yesterday continued to strip ridges of available snow and load leeward slopes.  Much of the loading occurred on north and east aspects as the bulk of the wind was blowing up Turnagain arm from the west.  A hike up Sunburst yesterday showed evidence that these 1-3 day old wind slabs are increasing in strength and bonding with underlying layers.  That being said, steep slopes (greater than 40 degrees) add further stress to this wind slab interface and should be avoided for another day while this problem continues to heal.  Look to bypass steep leeward slopes and cross-loaded gullies that have a smooth and fat look, or if the surface feels stiff or sounds hollow seek out mellower, low consequence terrain. 

It’ll be important to recognize where these wind slabs exist today as your obvious signs of instability (recent avalanches, cracks or whoomphing) may not be present.

Sustained westerly winds on Sunburst ridge yesterday acting to erode away this cornice.  Note this is an atypical direction for winds in the Turnagain area. 

As with all of your days in the mountains, safe travel protocol is the name of the game.  Ski slopes one at a time and talk thru plans with your group before executing.  No matter how benign or extreme a slope may be, it’s always good habit to think through a few questions: “What will I do if this slides?  Where is my escape route?  Where is my safe zone?”

Cold temperatures will promote a loosening of the snow surface and provide for potentially fast moving sluffs.  If anticipated, these should be low enough in volume to not be much of a concern, unless travelling above a terrain trap such as a cliff or deep gully.