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Avalanche Forecast

Archived

Jan 6th, 2013–Jan 7th, 2013

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

Regions

Glacier.

The high pressure system has been pushed out by new snow and wind, it's time to return to more conservative terrain choices.

Weather Forecast

Northwesterly flow moving eastward will end significant precipitation. Light amounts are forecast in the unsettled and cool air mass left in the wake of last nights storm.

Snowpack Summary

20cm of new snow over a facetted old snow interface. The Dec 25 and January 4 surface hoar layers are down around 30cm and 20cm respectively where present, mostly from 1500 to 2000m. The mid-pack is still well settled except in shallower areas where it has become weak and facetted. The Nov 6 crust is down 130cm.

Avalanche Summary

1 loose natural avalanche, solar triggered, size 1.5 observed east of the Roger's Pass summit on a south aspect at 2590m.

Confidence

Timing, track, or intensity of incoming weather system 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.

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.