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Avalanche Forecast

Archived

Jan 25th, 2012–Jan 26th, 2012

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

Regions

Cariboos.

Confidence

Good - -1

Weather Forecast

Flurries are expected to continue on Thursday. The wind should become light to moderate from the south on Thursday as the weak ridge of high pressure moves into the region. High pressure should continue to build on Friday; however moderate gusty westerly winds and flurries are expected to bring another 5-10 cm by evening. The next Pacific system is forecast to move into the region by early Saturday afternoon. Southwest winds should build to strong combined with moderate to heavy snowfall by Saturday evening.

Avalanche Summary

No new avalanches reported from Tuesday due to poor visibility and travel conditions.

Snowpack Summary

The new storm snow is the greatest concern at this time. There has been 40-60 cm of storm snow in the valley since Monday. The freezing level went up to about 1000 metres early Wednesday morning. The weak facet layer that was buried on January 20th is now down about 80 cm and continues to produce easy shears in tests.

Problems

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.

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.