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Avalanche Forecast

Archived

Mar 13th, 2020–Mar 14th, 2020

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 unlikely, human triggered possible.
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 unlikely, human triggered possible.

Regions

Glacier.

Storm slabs are reactive to mountain travelers. The persistent weak layer, if triggered has the potential to propagate into large avalanches

Weather Forecast

Flurries are forecast throughout the day today with light reverse winds from the east/northeast bringing decreasing temperatures to a low of -20 by the afternoon. Cold temperatures will persist through Saturday with clearing skies and continued light wind. Warming up on Sunday and clearing.

Snowpack Summary

Up to 30cm of storm snow on Tues night, that came in with mod to strong SW wind, is now settling over the Mar 10 interface of surface hoar on shaded slopes and suncrust elsewhere. Below this slab the Feb 22 persistent weak layer is down 90-130cm and consists of 3-7mm surface hoar on all aspects up to 2450m and a crust on solar aspects.

Avalanche Summary

Wednesday's avalanche cycle produced natural avalanches to size 3 and controlled avalanches to size 3.5 in the highway corridor. The slides from avalanche control were mainly confined to the storm snow with Camp West path possibly digging deeper. Natural activity decreased yesterday but the storm snow is still reactive to skiers.

Confidence

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.