Avalanche Forecast
Issued: Nov 28th, 2017 8:04AM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Storm Slabs.
andrew jones,
Parks Canada
While cooler temperatures are healing the rain-soaked snowpack, avalanche hazard is INCREASING with the formation of a storm instability over a widespread crust.
Summary
Weather Forecast
Unsettled weather and flurries persist into the weekend with 40cm of accumulation expected by late Saturday. A fast moving storm front will track across the province today bring strong SW winds and 8cm of snow to Rogers Pass. Freezing level rises to 1100m.
Snowpack Summary
30cm of dry surface snow sits atop the Nov 23/26 crust complex at tree line. This crust is 2-4cm thick and is mostly supportive to skiers above 1700m. Below the crust the snowpack is moist and weak. At higher elevations the Oct. 31 crust survived the rain and is down ~120cm. Strong southerly winds created pockets of wind slab in the alpine.
Avalanche Summary
No new avalanches were observed in the highway corridor.
Confidence
Forecast snowfall amounts are uncertain
Problems
Storm Slabs
New snow and winds have created a storm slab that sits atop a supportive crust down 30cm. This layer will become more reactive with ongoing loading from wind and snow. This is an evolving problem that requires careful evaluation and decision making.
Dig down to find and test weak layers before committing to a line.Avoid avalanche terrain during periods of heavy loading from new snow and wind.
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Valid until: Nov 29th, 2017 8:00AM
