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Avalanche Forecast

Archived

Jan 26th, 2022–Jan 27th, 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.

Good quality turns can be found in sheltered locations. Forecast inversion and solar input could increase sensitivity of avalanche problems Thursday.

Weather Forecast

Thursday

Mostly sunny.

Precipitation: Nil.

Alpine temperature: High -7 C.

Ridge wind west: 15 km/hr.

Freezing level valley bottom.

Friday

Mostly cloudy.

Precipitation: Nil.

Alpine temperature: Low -11 C, High -9 C.

Ridge wind light west.

Freezing level valley bottom.

Saturday

Mostly cloudy.

Precipitation: Nil.

Alpine temperature: Low -12 C, High -9 C

Snowpack Summary

Widespread wind effect and stripping in alpine from previous strong to extreme SW winds. Wind slab in specific areas tree line and above. Thin sun crust on steep solar aspects up to ~2300m. The midpack is mostly supportive. Weak facet layer down ~20-30cm and a crust down 40-60cm below 1950m, faceting but still reactive in snowpit tests.

Avalanche Summary

Patrol and tour south end of Churchill range noted no new avalanche activity.

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.