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Avalanche Forecast

Archived

Mar 10th, 2017–Mar 11th, 2017

Alpine
Natural and human triggered avalanches likely.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches possible, human triggered probable.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural and human triggered avalanches likely.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches possible, human triggered probable.

Regions

Glacier.

A spike in avalanche hazard today, with new snow and warming temperatures. Avoid traveling under large avalanche paths that can run full path.

Weather Forecast

10-15cm of new snow is expected today, freezing level rising to 1500m with an Alpine high of -5 and wind gusting to 50km/h from the south west. A lull in storm systems tomorrow, than the long term forecast looks warm and wet!

Snowpack Summary

Incremental new snow this week plus another 15cm last night pushes our March total easily over 1m of new snow @ 1900m! The late Feb crusts on solar aspects now lie between 50cm and 1m in depth, and a spotty mixed form layer lies under the storm snow on more polar asp. The Nov Cr remains dormant while the midpack is gaining strength and rounding.

Avalanche Summary

Yesterday there was a MCR and a MIN post of 2 small size 1 slab avalanches failing on the late Feb Cr in the Connaught slide path and one size 1 slab avalanche on route to little Sifton . This am in the highway corridor we observed 2 size 3 avalanches (Tupper 1 and 2 slide paths) running full path. We think this will increase through out the day.

Confidence

Due to the number and quality of field observations

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.