Avalanche Forecast

Issued: Jan 24th, 2017 4:00PM

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

max darrah, Parks Canada

Jasper.

Natural avalanche activity appears to be tapering off, but there is still a high degree of spatial variability and low confidence in the stability of the snowpack.

Summary

Weather Forecast

No new precipitation on the horizon. Mild temperatures with calm to light Northerly winds. Sunny and clear.

Snowpack Summary

Last week's 20-30cm of rapidly settling and wind distributed storm snow overlies facets and basal weakness. New reactive windslabs in lee gully features and especially on NE aspects. Extensive scouring of last weeks snowfall at and above treeline.

Avalanche Summary

One new size 2.5 slab avalanche out of a steep rock slab at 2300m, East aspect. May have been triggered by cornice fall.

Confidence

Due to the number of field observations

Problems

Wind Slabs

Main concern is for cross loaded gully features and steep rocky convexities on lee aspects where fresh windslabs are present.

Use caution in lee areas. Recent wind loading has created wind slabs.Be careful with wind loaded pockets while approaching and climbing ice routes.

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

Elevations: Alpine, Treeline.

Likelihood

Possible - Likely

Expected Size

1 - 3

Deep Persistent Slabs

The weak lower snowpack is susceptible to triggering in lee areas that have been recently loaded by SW winds and last week's snow.

Watch for whumpfing, hollow sounds, and shooting cracks.If triggered the wind slabs may step down to deeper layers resulting in large avalanches.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 3

Valid until: Jan 25th, 2017 4:00PM