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Avalanche Forecast

Archived

Feb 2nd, 2015–Feb 3rd, 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.
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.

Excellent ski conditions in Little Yoho today with 35 cm of blower powder at higher elevations, and 20 cm in valley bottoms. Looks like another two days of great conditions until things change significantly on Thursday as another storm approaches.

Weather Forecast

Westerly flow continues with the storm track now positioned directly over the area.  No significant systems embedded for the next few days, so expect light flurries with only a few cm of accumulation for Tuesday and Wednesday. Light winds continue to be forecast.  A significant system will cross the region on Thursday with of 30 cm expected by Sat.

Snowpack Summary

35 cm of low density storm snow has fallen at 2500 m over the last few days, with minimal to no wind effect. 20 cm in the valley bottom. This new snow sits upon a melt-freeze crust until 2200 m. Shears exist within the new snow, and there is a tremendous amount of new snow available to blow into windslabs. So far the wind has been light . . .

Avalanche Summary

Loose snow sluffing out of cliffs was observed in numerous locations today.

Confidence

Wind speed and direction is uncertain

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.