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Avalanche Forecast

Archived

Nov 19th, 2015–Nov 20th, 2015

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

Regions

Little Yoho.

Great ski conditions and a supportive snowpack, considering its November. Watch for fresh wind slabs which can still be triggered at higher elevations.  SH

Weather Forecast

Friday will see alpine temperatures in the -15 to 18C range with light N to NW winds and little snow.  The weekend will warm up with a slight temperature inversion, although it will stay below freezing.  Winds will shift to the West and will increase to moderate.

Snowpack Summary

Essentially 2 major snowfall events in the past week has created the snowpack. The latest one from Tues threw down 50cm low density snow in the area. A profile in Little Yoho today at 2200m found a 120cm, well settled snowpack with 30cm settled powder on top. Some high alpine areas may have a facetted base, formed in the late fall.

Avalanche Summary

No new avalanche observations today. Avalanche control in Yoho yesterday produced either sloughing, or wind slabs to size 2.5 in high alpine terrain and benched cliffs. One slide on Stephen near 3000m stepped 2 meters deep near the ground. The vast amount of avalanches were 40-80cm deep. There was a surprising lack of activity in the area.

Confidence

Due to the number of field observations 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.