Avalanche Forecast
Issued: Apr 4th, 2017 4:50PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Persistent Slabs and Cornices.
Lisa Paulson,
Avalanche Canada
Hazard is rated Low in the morning below tree-line. It may rise to Considerable in the afternoon with rising freezing levels and temperatures, especially if there is any sun affect.
Summary
Weather Forecast
Expect another good freeze tonight. Tomorrow flurries and showers move into the region with freezing levels climbing to 2100 m . Freezing levels will remain at this level Wednesday and Thursday night with flurries and showers through both days.
Snowpack Summary
On shaded aspects or higher in the alpine, up to 20 cm sits on a well settled mid-pack. In shallow areas (Field ice climbs) the base is weak and facetted. Shears persist on this facet interface. In deeper areas (Little Yoho Valley), the deep weak layers are less of a concern. Expect buried sun crusts on solar aspects, and a melt freeze crust BTL,
Avalanche Summary
Several cornice triggered avalanches up to size 2 were reported on the Wapta Monday.
Confidence
Problems
Persistent Slabs
The snowpack is stabilizing after the last avalanche cycle, and now we are left with a low probability, high consequence problem. Natural avalanches have mostly ceased, but triggering is still possible - especially from large loads like cornices.
- Be aware of thin areas that may propogate to deeper instabilites.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Cornices
Cornices are big and we are getting regular reports of cornices failing. A large cornice fall could trigger a bigger avalanche on the slope below.
Aspects: North, North East, East.
Elevations: Alpine.
Likelihood
Expected Size
Valid until: Apr 5th, 2017 4:00PM
