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Avalanche Forecast

Archived

Nov 24th, 2013–Nov 25th, 2013

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

Regions

Little Yoho.

Early season ski conditions exist. However, some ice climbs are in good shape. Ice climbers be mindful of the potential for increased temperatures starting Tuesday.

Weather Forecast

Generally, clear weather will persist throughout the week. By Tuesday expect to see freezing level climb above 3000m. This effect could produce an increase in avalanche activity, especially on solar aspects.

Snowpack Summary

Approximately 90 to 100cm of snowpack exists at treeline locations. Today, the forecasting team observed surface hoar up to 3mm in size. Remember this for later. The snowpack is generally comprised of facets and mixed forms that overly the Oct 27th crust which lies approx 15cm from the ground. Tests produced moderate result on the Oct crust.

Avalanche Summary

No avalanche activity was observed or reported today.

Confidence

Freezing levels are uncertain on Tuesday

Problems

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.