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Avalanche Forecast

Archived

Feb 25th, 2013–Feb 26th, 2013

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

Regions

Sea To Sky.

Confidence

Fair - Due to limited field observations

Weather Forecast

Tuesday: Trace amounts of new snow / Moderate southwest winds / Freezing level at 800mWednesday: Light snowfall / Moderate southwest winds / Freezing level at 800mThursday: Heavy snowfall /  Moderate south winds / Freezing level at 1100m

Avalanche Summary

A size 2.5 avalanche was triggered by a party of sledders on Sunday in the Brohm Ridge area, and left a man buried 1.8 metres below the surface. The man was successfully rescued.  Check out the Forecaster blog for the full story.Explosive control produced avalanches to size 2 on Monday. With the current snowpack structure and weather forecast for Thursday, the possibility of triggering large to very large avalanches will continue throughout the week .

Snowpack Summary

Heavy amounts of recent snow and strong winds have created deep and destructive storm slabs. Underneath the new snow, you may find surface hoar that was buried on February 20th. Field reports suggest that it is reactive in many areas throughout the region, particularly at treeline and sheltered alpine terrain where broad shooting cracks have been observed. Where it exists, the buried surface hoar will certainly prolong the reactivity and destructive potential of the newly developed slab. The mid and lower snowpack layers are generally strong and well settled.The current weather will likely be forming new cornices. Expect cornices to be large and unstable.Total snow depths vary from around 400 cm in the south to around 180 cm in the north.

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.