Avalanche Forecast

Issued: Feb 22nd, 2017 8:00AM

The alpine rating is moderate, the treeline rating is low, and the below treeline rating is low. Known problems include Wind Slabs.

Parks Canada percy woods, Parks Canada

Alpine North aspects are providing the best skiing.  Watch for fresh soft slab at ridge top.

Summary

Weather Forecast

A weak upper trough will drift east from the coast today bringing afternoon convective flurries. As it passes there will be a shift to drier modified arctic air to move south. Alpine high of -10C today and light ridge top winds. The freezing level should rise to 800m this afternoon. Little in the way of precipitation for the remainder of the week.

Snowpack Summary

Winds picked up last evening from the S-SW into the moderate range likely forming soft slabs on lee features in the alpine. Trips to Perly Rock area and Lily Dome loop found generally well bonded snow and little wind effect. Layers of concern down 30-60cm are crusts on S aspects and surface hoar on protected north facing terrain.

Avalanche Summary

Two slides to size 2 out of steep solar terrain on Mt Tupper yesterday at mid-day. One size 1 slab off the N aspect of the wind scoop below the W side of Dome col. This slide was 20cm deep, 40m across and ran down into the scoop, maybe 10m distance. This slide appeared to be human triggered sometime on February 20.

Confidence

The weather pattern is stable

Problems

Wind Slabs

An icon showing Wind Slabs
Freshly formed soft windslab can be expected along the immediate lee of ridge lines and alpine cross winded features.
Use caution in lee areas. Recent wind loading has created wind slabs.

Aspects: North, North East, East, South East.

Elevations: Alpine.

Likelihood

Possible

Expected Size

1 - 2

Valid until: Feb 23rd, 2017 8:00AM