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Avalanche Forecast

Archived

Dec 4th, 2015–Dec 5th, 2015

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

Regions

Little Yoho.

Ski quality is refreshed, but watch local snow amounts as we expect a slow rise in the avalanche danger. Treeline and below will see the biggest change in the next few days as new snow will be sitting over surface hoar and will slide readily. SH

Weather Forecast

Scattered flurries Sat with temperatures staying below freezing and light to mod SW winds.  Saturday night will see a bigger pulse with 5-10cm expected each day through next week.

Snowpack Summary

5-20cm overlies the Dec 3rd interface of surface hoar, suncrust and surface facets at treeline. Surface hoar up to 20mm exists up to 1800m in the Emerald Lake area. Above 1800m, due S to SW facing terrain a suncrust exists and other aspects are soft facets or wind hammered snow. Snowpack depth is about 100cm. Wind slabs forming in immediate lees.

Avalanche Summary

No new avalanches were observed or reported.

Confidence

Due to the number and quality of field observations on Friday

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.