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Avalanche Forecast

Archived

Apr 14th, 2022–Apr 15th, 2022

Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Jasper.

We continue to see large cornice failures up to Sz 3. Select your route carefully to avoid exposure to cornices.

Weather Forecast

Friday will be cloudy with scattered flurries accumulating 5cm of snow. Temperatures are gradually warming with a high of -9. Winds will be light and freezing levels remain at valley bottom. Saturday will be cloudy with sunny periods and isolated flurries. Temperature will reach up to -7 in the alpine and freezing levels remain at valley bottom.

Snowpack Summary

Previous moderate north winds have created isolated wind slabs and reverse loading in wind prone areas. Marmot ski area reports these new slabs are bonding well to the previous surface. On solar aspects a 3cm sun crust exist up to 2400m under 10-15cm of snow. Likewise a 5cm melt-freeze crust exists up to 2200m on all aspects down 10cm.

Avalanche Summary

Cornice triggered size 2 wind slab observed on Pyramid Wednesday - south patrol noted no new activity. On Tuesday and Thursday two natural cornice falls were observed on the Churchill range. These cornices did not trigger slabs below. Also a small natural wind slab was observed around the Parker Ridge Area.

Confidence

Problems

Cornices

Cornice Fall is the release of an overhanging mass of snow that forms as the wind moves snow over a sharp terrain feature, such as a ridge, and deposits snow on the downwind (leeward) side. Cornices range in size from small wind drifts of soft snow to large overhangs of hard snow that are 30 feet (10 meters) or taller. They can break off the terrain suddenly and pull back onto the ridge top and catch people by surprise even on the flat ground above the slope. Even small cornices can have enough mass to be destructive and deadly. Cornice Fall can entrain loose surface snow or trigger slab avalanches.