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Avalanche Forecast

Archived

Mar 27th, 2016–Mar 28th, 2016

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

Regions

Little Yoho.

http://www.pc.gc.ca/apps/scond/Cond_E.asp?oID=23024&oPark=100815

The Little Yoho region has an overall deeper and more settled snowpack than the main range just to the East. Watch for thin areas where a larger avalanche can be triggered. See the Special Public Avalanche Warning link above for more details.

Weather Forecast

Cloud cover and below surface freezing levels are expected in the next 2 days. Very light precip amounts are expected to accompany the cloud cover. Upper level wind will shift to come from the N-NE

Snowpack Summary

A crust lies on solar aspects into the alpine and on shady aspects up to ~2000m where it disappears. In the top meter of the snowpack, several buried suncrusts exist and may still be a concern on west, south and east aspects but in general the snowpack is well settled. Low elevation snowpacks (Field ice climbs) are isothermal and slushy in the PM.

Avalanche Summary

One avalanche was reported on the West face of Mt. Ogden from a party coming off of the Bow-Yoho traverse. Size 3 and approximately 500m wide. It is expected to be approx 48 hours old. No further details.

Confidence

Due to the number and quality of field observations on Sunday

Problems

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.

Cornices

Cornice Fall is the release of an overhanging mass of snow that forms as the wind moves snow over a sharp terrain feature, such as a ridge, and deposits snow on the downwind (leeward) side. Cornices range in size from small wind drifts of soft snow to large overhangs of hard snow that are 30 feet (10 meters) or taller. They can break off the terrain suddenly and pull back onto the ridge top and catch people by surprise even on the flat ground above the slope. Even small cornices can have enough mass to be destructive and deadly. Cornice Fall can entrain loose surface snow or trigger slab avalanches.