Avalanche Forecast

Issued: Nov 26th, 2018 4:00PM

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

jonas hoke, Parks Canada

Jasper.

Snowfall amounts are uncertain, but combined with the ongoing strong winds may load lee terrain enough to increase the danger rating.

Summary

Weather Forecast

Ongoing strong SW winds. Snow flurries will give up to 10cm of new snow by Wednesday. Alpine temperatures will be between -4 C and -8 C. Click here for the Avalanche Canada mountain weather forecast.

Snowpack Summary

Strong SW wind with incoming snow flurries is building fresh windslab. The October 25 crust, sitting 0-40cm off the ground, remains a concern. This crust is most prevalent in deeper snowpack areas - found predominately on N-NE lee features. Faceting above and below this layer continues to weaken the lower snowpack.

Avalanche Summary

The local ski hill triggered two windslabs (one large/size 2) during explosive control work on Sunday.

Confidence

Forecast snowfall amounts are uncertain

Problems

Wind Slabs

Ongoing strong winds and incoming snow flurries will continue to build fresh windslabs.

If triggered the wind slabs may step down to deeper layers resulting in large avalanches.Use caution in lee areas. Recent wind loading has created wind slabs.

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

Elevations: Alpine, Treeline.

Likelihood

Possible - Likely

Expected Size

1 - 2

Deep Persistent Slabs

Assume all skiable slopes have this crust, and assess the strength of the interface before jumping into any committing lines. See forecast details for more info on this layer.

Watch for whumpfing, hollow sounds, and shooting cracks.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Unlikely - Possible

Expected Size

1.5 - 2.5

Valid until: Nov 27th, 2018 4:00PM