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Avalanche Forecast

Archived

Mar 31st, 2014–Apr 1st, 2014

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

Regions

Glacier.

We are entering a spring weather pattern where the hazard may be low in the morning but will increase as the day progresses. Monitor daytime warming for your location and plan to be off of big slopes by the afternoon.

Weather Forecast

A ridge of high pressure will maintain a dry weather pattern for the next few days with a mix of sun and cloud. Convective squalls may produce locally brief storms. Winds will remain light from the south west and freezing levels are expected to rise to 1400m today.

Snowpack Summary

Upper snowpack on solar aspects is moist to tree line and will have crusts at various depths, the Mar 22 down ~ 50cm, the Mar 13 crust down 75cm, the Mar 2 down 1-1.5m. On north aspects the upper snowpack consists of settling storm snow. The Feb 10 surface hoar crust layer is down 2m.

Avalanche Summary

No new avalanches observed yesterday.

Confidence

Timing or intensity of solar radiation is uncertain

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.