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Avalanche Forecast

Archived

Feb 17th, 2021–Feb 18th, 2021

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

Regions

Glacier.

Weather Forecast

Some isolated light flurries are possible over Rogers Pass from the passing upper trough this morning. Alpine temperature will hover in the -10 range, and winds will be light, possibly gusting moderate from the West. A clearing trend tonight, with light winds from the SW. Tomorrow a mixed bag of weather, with snow on the way this weekend.

Snowpack Summary

10-20cm of new snow covers a variety of old surfaces, from hard wind slabs in the alpine and exposed areas of TL, to low density facetted snow in sheltered areas at TL and below. The cold has weakened cornices and the upper snowpack. The January 24th interface is down 70-100cm and unreactive in stability tests.

Avalanche Summary

No new avalanches were observed int he HWY corridor yesterday. 2 size 1 slab avalanches were noted by field teams yesterday up Connaught Creek. 1 from Cheops North 1, and the 2nd on a west aspect above Ursus Trees.

Confidence

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.

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.