Avalanche Forecast

Issued: Apr 15th, 2012 4:00PM

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

a.l. horton, Parks Canada

Jasper.

A strong melt freeze crust exists in the morning below treeline which will begin to break down by mid-day. Expect winter conditions at treeline and above.

Summary

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

Timing or intensity of solar radiation is uncertain on Monday

Problems

Wind Slabs

On Saturday, size 2 slab avalanches were observed on north aspects below corniced ridge lines. Variable winds have created thin slabs on most aspects. No avalanche activity was observed on Sunday however slab bonding has not been tested.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible - Likely

Expected Size

1 - 3

Loose Wet

Cold overnight temperatures have formed a supportive melt freeze crust in most locations. Direct sun, warm temperatures and rain will quickly weaken this crust, dramatically increasing the avalanche potential. Pay attention to warming conditions.

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

Elevations: Alpine.

Likelihood

Likely

Expected Size

1 - 2

Deep Persistent Slabs

Recent size 2 slab avalanches have been observed on this layer on NE aspects. These slides were initiated by small loose snow avalanches. These deeper layers can wake up unexpectedly on all aspects.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

2 - 4

Valid until: Apr 16th, 2012 4:00PM