Avalanche Forecast

Issued: Nov 21st, 2011 4:14PM

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

a.l. horton, Parks Canada

Jasper.

The avalanche danger has increased to HIGH with up to 35 cm of snow expected in the next 24 hours.

Summary

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

Timing, track, or intensity of incoming weather system is uncertain on Tuesday

Problems

Storm Slabs

A warm wet weather system will arrive Monday night with strong south to southwest winds and up to 35 cm of snow forecast in the Icefield Area (lesser amounts are expected further north in the forecast area)

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

Elevations: Alpine, Treeline.

Likelihood

Very Likely

Expected Size

2 - 4

Persistent Slabs

Warm temperatures and heavy snow may increase the possibility of natural avalanches on the weak basal facets below these slabs.

Aspects: North, North East.

Elevations: Alpine, Treeline.

Likelihood

Likely

Expected Size

1 - 3

Wind Slabs

SW winds continued to build slab thickness. Natural activity is expected especially on steeper terrain.These slab may have developed further down slope from ridgelines.

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

Elevations: Alpine, Treeline.

Likelihood

Likely

Expected Size

1 - 3

Valid until: Nov 22nd, 2011 4:00PM