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Avalanche Forecast

Archived

Jan 25th, 2022–Jan 26th, 2022

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

Regions

Jasper.

Winds are at it again... wind slab problem in the alpine and exposed tree line features remains on the radar.

Weather Forecast

Wednesday

Mostly sunny.

Precipitation: Nil.

Alpine temperature: High -8 C.

Ridge wind northwest: 10-25 km/hr.

Freezing level valley bottom.

Thursday

Mostly sunny.

Precipitation: Nil.

Alpine temperature: Low -9 C, High -7 C.

Ridge wind light west.

Freezing level valley bottom.

Friday

Mostly cloudy.

Precipitation: Nil.

Alpine temperature: Low -12 C, High -8 C

Snowpack Summary

Continued widespread wind effect and stripping in alpine from renewed strong to extreme SW winds; Monday saw a period of reverse loading values. Thin sun crust likely on solar aspects into the alpine. The midpack is mostly supportive. Weak facet layers down ~20-30cm and a crust down 40-60cm below 1950m, faceting but still reactive in snowpit tests.

Avalanche Summary

Maligne patrol Tuesday noted no new avalanche activity - no patrol south. 

Confidence

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.

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.