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Avalanche Forecast

Archived

Mar 12th, 2021–Mar 13th, 2021

Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.

Regions

Glacier.

The surface snow may still become moist today. Use caution where there is potential for entrainment of moist snow

Weather Forecast

A ridge of high pressure building from the SW will keep the park dry for the next few days but the freezing level will rise each day peaking on Sunday

Friday: light SW wind, high of -3, freezing level 1700m

Saturday: light S wind, high of +1, freezing level 2200m

Saturday: light S wind gusting 45, high -1, freezing level 2400m

Snowpack Summary

Another dusting overnight Thursday brings the total to 25cm in the last few days and 50cm since Saturday. A breakable suncrust can be found down 15cm in open areas and a second crust down 25cm on all aspects to treeline, higher on solar aspects.

Avalanche Summary

Several skier triggered sz 1 windslabs have been reported from N to E lee slopes Wednesday and Thursday. In the western Selkirks a skier was fully buried in a sz 2 windslab they triggered on Thursday but were rescued with no injuries. In the Purcells a natural size 2 failed on a NE aspect at treeline.

Confidence

Due to the number and quality of field observations

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.