Spring Conditions. Cloudy and cooler conditions will reduce the size and likelihood of loose wet and wet slab avalanches. New surface crusts are expected to develop over the next few days.
Summary
Weather Forecast
Cloud developing inland overnight with light southeast winds and freezing levels near 3000 metres..Light to moderate convective rain showers on Friday with gusty winds and freezing levels close to 3000 metres. Moderate rain on Saturday with light winds and freezing levels dropping to 2500 metres. Cooling trend continuing on Sunday with freezing levels down to 2000 metres by the end of the day.
Avalanche Summary
No new avalanches reported. On Tuesday a size 3.0 wet slab avalanches was explosives triggered in the Duffey Lake area, this large avalanche released down to the ground on a northwest aspect at 2200 metres and ran to the valley bottom. Most commercial operations in the region have finished their season and data is sparse.
Snowpack Summary
Forecast cloud, cooling, and new snow at higher elevations will reduce the likelihood of loose wet and wet slab avalanches. Areas that get rain on top of a snowpack that has not re-frozen may continue to see sporadic wet slab avalanches. Monitoring the overnight freeze of the snow surface is very important. If the snow surface does not freeze overnight or if the crust is only a few cm thick, the effect of daytime heating or rain will weaken the snowpack much more quickly than it would if there is a well frozen thick crust. This is because the crust must first melt before the heat can weaken the snowpack. Low elevation and thin snowpack areas have become isothermal, meaning the snowpack is 0 degrees Celsius throughout. An isothermal snowpack is more prone to full depth wet slab avalanches during the heat of the day, especially on steep rocky faces.
