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Avalanche Forecast

Archived

Feb 1st, 2017–Feb 2nd, 2017

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

Regions

Little Yoho.

We have moved to a "Moderate" rating due to lack of natural activity. Keep in mind that the snowpack is weak in many Little Yoho locations, and large avalanches are still possible. If there is a slab overlying facets, its suspect. SH

Weather Forecast

Lows of -20c and highs of -15C for Thursday with light N winds and no new snow.  Currently a big storm is in the forecast for this weekend, but we have all heard that one before...  stay tuned.

Snowpack Summary

Wind slabs formed from strong winds this week. A generally weak snowpack exists below 2000-2200m. At 2000m, there is generally 140 cm of snow, with the Jan 17 surface hoar layer down 30cm. In the mid-pack, the Dec facets are around 20cm thick, and near the ground some weak facets sit just below an ice crust. More solid snowpacks exist above 2200m.

Avalanche Summary

There was a small avalanche cycle this past weekend from strong winds.  The activity has slowed significantly due to decreased winds and cooling temperatures.  No avalanches reported Wednesday.

Confidence

Timing, track, or intensity of incoming weather system is uncertain on Saturday

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.