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Avalanche Forecast

Archived

Apr 1st, 2017–Apr 2nd, 2017

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

Regions

Little Yoho.

A storm has brought new snow and moderate to strong winds to the area. It would be wise to let the snowpack adjust to this change as most inputs over last two months have induced avalanche cycles.

Weather Forecast

The current storm will have brought up to 10cm of new snow and rain below 1800m by the time it passes late Saturday. The moderate to strong west winds will back off into Sunday however trace amounts will continue to accumulate as temperatures cool. Clearing Monday will bring a cool morning and potentially some solar heating with very light winds.

Snowpack Summary

5 new plus 10 to 20cm of recent snow sits on a well settled mid-pack. In shallow areas (Field ice climbs) the base is weak and facetted. Shears persist on this facet interface. In deeper areas (Little Yoho Valley), the deep weak layers are less of a concern. Expect buried sun crust on solar aspects, temperature crusts BTL, and wet snow below 1800m,

Avalanche Summary

Loose wet activity that was seen on Friday likely continued to a lesser degree today with rain below 1800m. Although no direct observations were made in the Little Yoho Region today, small new windslabs at alpine and treeline elevations were reacting to skiers in the Banff region today.

Confidence

Timing or intensity of solar radiation is uncertain on Monday

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.

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.