Avalanche Forecast

Issued: Jan 15th, 2013 10:01AM

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

jlammers, Avalanche Canada

South Rockies.

Summary

Confidence

Fair - Due to variable weather conditions

Weather Forecast

A mix of sun and cloud is expected for the forecast period with light snowfall possible each day. Winds are forecast to be strong from the northwest. Freezing levels are expected to remain at valley bottom; however, there is a strong chance of an inversion each day until Friday.

Avalanche Summary

No new significant avalanche observations have been reported from the region.

Snowpack Summary

New windslabs may exist in unusual locations to strong winds and the northwesterly influence. Below this around 60cm of settled snow rests on a myriad of old surfaces (January 4th interface) that include sun crust on steep south and west facing terrain, surface hoar in sheltered locations at treeline and below and facets everywhere else. The bond at this interface seems to have strengthened somewhat with time. The overlying slab has also settled significantly.The midpack is well settled and strong with one or two (location specific) crusts deep in the snowpack. These crust/facets combos are largely dormant, with the only concern being triggering from a shallow snowpack area or with a heavy trigger.

Problems

Wind Slabs

Strong northwest winds are expected to form new windslabs. Watch for loading in unusual locations.

Avoid travelling in areas that have been reverse loaded by winds.>Be cautious as you transition into wind affected terrain.>

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

Elevations: Alpine, Treeline.

Likelihood

Likely

Expected Size

1 - 4

Persistent Slabs

This layer may spring back to life if warm temperatures and sunshine develop. Slopes that didn't slide in the last avalanche cycle are of particular concern. Pull back to simple terrain without overhead hazard if it warms up.

Be aware of the potential for large avalanches due to the presence of buried weak layers.>

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Possible - Likely

Expected Size

1 - 5

Valid until: Jan 16th, 2013 2:00PM