Avalanche Forecast

Issued: Nov 28th, 2017 3:00PM

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

matt.mueller, Alberta Parks

Kananaskis.

Our snowpack seems to get more and more complex as each day passes. Its a good idea to dig and familiarize yourself with conditions before venturing into avalanche terrain.

Summary

Confidence

High -

Weather Forecast

Winds will continue overnight and tomorrow. They will be westerly and about 65km/hr at ridge top. Only a few flurries are expected with no real accumulation. Temperatures will hover around -12 degrees.

Avalanche Summary

Nothing new today.

Snowpack Summary

Snow profiles in the Highwood area today offered a good glimpse of our current snowpack. At treeline, snow depth is anywhere from 60-100cm deep. The surface snow character is dependant on wind exposure. Some areas are a softer slab, while others are quite hard (kicking to get a ski edge in) and often hollow sounding. The recent rain crusts (Nov 26 & Nov 23) are down 40cm on average and are 2 distinct layers. These 2 crusts are very obvious and well bonded for the time being. We'll have our hands full when that changes...The Oct 31crust is breaking down and variable in its character. Some places it is intact and others it has broken down/compressed and become part of the "base" snowpack. In both instances, it is still considered a weak layer and failing in tests after moderate loads. In the alpine it is very similar, but the depths are proportionally deeper. The surface wind slabs are concerning as they are failing under lighter loads (CT easy SC). Windloading in ongoing, so expect these numbers to change rapidly if the wind continues.

Problems

Wind Slabs

Expect windslab development in lee and cross loaded gullies.

Use caution in lee areas. Recent wind loading has created wind slabs.Avoid freshly wind loaded features.Watch for areas of hard wind slab in steep alpine features.

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

Elevations: Alpine, Treeline.

Likelihood

Likely

Expected Size

1 - 2

Persistent Slabs

The new crusts are preventing the deeper layers from disturbance. Remember, in shallow areas it is still possible to trigger the deeper layers.

Be aware of the potential for wide propagations.Be cautious in shallow snowpack areas where triggering is more likely.

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

Elevations: Alpine, Treeline.

Likelihood

Unlikely - Possible

Expected Size

2 - 3

Valid until: Nov 29th, 2017 2:00PM