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Avalanche Forecast

Archived

Jan 25th, 2013–Jan 26th, 2013

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

Regions

South Coast.

Confidence

Poor - Timing, track, or intensity of incoming weather is uncertain for the entire period

Weather Forecast

Saturday: Light NW wind. Alpine temperature near -7. Light snow.Sunday: Moderate SW wind. Alpine temperature near -8. Light snow.Monday: Light NW wind. . Alpine temperature near -11. Light snow is possible.

Avalanche Summary

Size 1 loose dry avalanches were observed on Thursday.

Snowpack Summary

Around 15 cm snow overlies a medley of surfaces including hard old wind slabs, thin and thick crusts and large surface hoar crystals which can be found in sheltered terrain below treeline. Winds have created soft slabs in the lee of terrain features in some areas. A surface hoar layer buried down 40-80 cm seems to be gaining strength, but still exhibits moderate, sudden results in isolated snowpack tests. Near the base of the snowpack, a crust/facet layer exists, which is now unlikely to be triggered, except perhaps by heavy triggers in unsupported, shallow, rocky terrain where more faceting has taken place.

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.