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Avalanche Forecast

Archived

Jan 24th, 2022–Jan 25th, 2022

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

Regions

Little Yoho.

Lots of wind effect out there, but good riding can still be found in sheltered locations. Remember to consider the persistent layers beneath your feet!

Weather Forecast

A relatively benign period of weather over the next few days as we are under the influence of a high pressure system. Temperatures will be in the -5 to -15 range Tues/Wed with a drop in temperature on Thursday morning to ~ -20. Alpine winds will switch to SW and increase to moderate to strong for Tues/ Wed before decreasing on Thurs. No precip.

Snowpack Summary

Wind effect and wind slabs in the alpine and exposed tree-line areas. New sun crusts can be expected steep solar slopes . 30 to 60 cm of recent snow lies over a facet interface formed in late December. The Dec. 2 crust and facets are generally 100-150cm deep producing hard to no results. Snow depth at tree-line is around 200-250 cm.

Avalanche Summary

One small windslab was noted on a field trip in Little Yoho today. A size 1 triggered by sluffing out of steep alpine terrain. Otherwise, no new avalanches observed or reported on Monday

Confidence

The weather pattern is stable

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.