Avalanche Bulletin – Banff, Yoho, and Kootenay National Parks – Fri Mar 17, 2017

Another pulse of snow coming through Saturday although forecast amounts have shrunk somewhat.  Expect 20 to 30cm with moderate to strong alpine winds and freezing levels to 2000m. 

This means rain will fall at lower elevations.  On Sunday precipitation will taper off with moderate alpine winds and temperatures will drop off to -15 to 18C.

30-60cm of recent storm snow and wind have built significant load over a fundamentally weak snowpack. The mix of previous rain, warm temperatures, and this new snow is overloading buried storm and windslabs, as well as the weak basal facet layers. Cooling Friday helped curb natural activity, but only slightly

A flight up Hwy. 93N today showed the extent of the avalanche carnage up to size 4 on all aspects and elevations. Some fracture lines are over 1km wide. Explosive control at the ski hills and on Hwy 93 South produced large results up to size 3.5 stepping down to the deep Dec. facets or the ground showing it is still extremely sensitive out there.

More from http://avalanche.pc.gc.ca