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Avalanche Forecast

Archived

Nov 25th, 2015–Nov 26th, 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 unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

Little Yoho.

Looks like a beautiful few days ahead, with clear skies and gradually warming temperatures. Expect a significant warm up for the weekend, with freezing levels to 2500 m on Saturday and valley bottom temperatures climbing above zero.

Weather Forecast

High pressure dominates for the next few days, but with an accompanying deep freeze. Starting Wed at noon, warmer air began to overrun the cold air in the valley bottoms and a classic inversion (warmer air aloft) situation is establishing. Thursday remains cool (-5 to -15), but a big warm up starts on Fri with freezing levels reaching 2500m on Sat.

Snowpack Summary

10 cm of snow from Monday night has been blown into small windslabs up to 20 cm deep in isolated areas leeward to the north winds. Otherwise, the snowpack is relatively well settled for November in the Rockies, with no persistent weak layers (yet). However, we expect the facetting process to be well underway this week in areas of shallow snow.

Avalanche Summary

Other than small, isolated surface slabs up to size 1 reported by the ski area avalanche control teams, we have observed no fresh avalanches in the last 72 hours. However, we have no observations from high alpine, glaciated terrain so remain slightly uncertain about this kind of terrain.

Confidence

Due to the number of field observations

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.