In response to COVID-19 and the temporary suspension of many of Parks Canada’s visitor services, public avalanche bulletins will no longer be issued for the remainder of the 2020 spring season. This is a time to avoid the backcountry. Please stay home to help limit the spread of COVID-19, and to minimize demands placed on emergency response teams and the health care system.
30cm + of new snow in the last 24 hours, and another 15cm of forecasted snow will form storm slabs in the Alpine and at Treeline. Winds are forecasted to increase this afternoon, which should spike today's avalanche cycle!
The new snow will struggle to bond to the old surface layers and sluff easily in steep terrain. Loose dry avalanches can gain mass and potentially trigger storm slabs and or persistent slabs.
Storm slabs have the potential to step down to a buried weak layer (Nov 23 Surface Hoar) now down 45-65cm. It consists of surface hoar at treeline and below, and a crust on steep solar aspects into the alpine.
Deep persistent slabs are best managed by:
Cornices are best managed by:
Today: 15-20cm of new snow, winds will be light to moderate possibly gusting strong this afternoon out of the South, and the freezing level should stay below valley bottom (VB). Tonight: Another 10cm, winds increasing from the SW, and temps staying cool with the FL staying well below VB. Flurries for Wednesday, and a clearing trend on Thursday
30 of new snow covers a facetted upper snowpack and previously wind affected surfaces. The two main interfaces to watch for are the storm slab interface down 30cm+ and the Nov 23rd surface hoar/ crust buried 40-60cm. Multiple buried crusts exist lower in the snowpack, but recent profiles are showing no significant shears on stability tests.
We should see a natural avalanche cycle today with the 20cm of new snow that fell last night, plus another 15cm forecasted today! No new avalanches were reported from the highway or the backcountry yesterday; however, we are already starting to see some activity in the Highway corridor this morning!