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Avalanche Forecast

Archived

Mar 23rd, 2022–Mar 24th, 2022

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

Regions

Jasper.

A rapid drop in temperatures will likely freeze shut all the moist snow tree line and below. New snow and strong winds will have built fresh wind slabs.

Weather Forecast

Thursday

A mix of sun and cloud.

Precipitation: Nil.

Alpine temperature: High -8 C.

Ridge wind west: 10-30 km/h.

Freezing level at valley bottom.

Friday

Cloudy with sunny periods and isolated flurries.

Precipitation: Trace.

Alpine temperature: Low -10 C, High -4 C.

Ridge wind southwest: 10-20 km/h.

Freezing level: 1700 metres.

Snowpack Summary

Freezing levels were around 2300m on Wednesday afternoon. The top 10cm of snow at tree line was moist. Strong SW winds and new snow building are building wind slabs in the alpine and exposed tree line.

Avalanche Summary

Over the last 48hrs there has been a widespread wet loose avalanche cycle mostly tree line and below off steep, rocky, and shallow features. Also several wind slabs up to size 2 have been noted in the alpine. One wet loose avalanche on Tuesday caused by rockfall on Polar Circus caught two climbers resulting in serious injures.

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.