Avalanche Forecast

Archived

Apr 29th, 2013–Apr 30th, 2013

Alpine

Natural avalanches unlikely, human triggered possible.

Treeline

Natural avalanches unlikely.

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.

Tomorrow we will issue our last bulletin for the season. Likely it will include generic advice for spring time conditions. Also, we expect an increase in temp by Thurs and a subsequent springtime avalanche cycle. Low in the AM and High in the PM.

Weather Forecast

Colder than seasonal temperatures and light precip is expected until Thursday. Little change until then. However, temperatures will rise drastically by Friday and we expect to see a large spring avalanche cycle at that time.

Snowpack Summary

Cooler temperatures have refrozen the snowpack. Upper elevations have new fresh snow and some wind-slabs.

Avalanche Summary

There have been a few cornice falls and steep wind slabs reported over the last week. All on steep terrain and not running very far.

Confidence

Timing or intensity of solar radiation is uncertain on Thursday

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.