Avalanche Forecast

Friday Night: Flurries, accumulation 5-10 cm. Alpine temperature -5 C. Moderate to strong west wind. Freezing level 1400 m.

Saturday: Flurries, accumulation 5-10 cm. Alpine temperature -6 C. Moderate west wind. Freezing level 1100 m.

Sunday: Flurries. Alpine temperature -9 C. Moderate west wind.

Monday: Mainly cloudy with scattered flurries. Alpine temperature -10. Moderate southwest wind.

There was widespread natural and explosives triggered storm and wind slab avalanche activity to size 2.5 and 3 on Wednesday and Thursday. Avalanches were 30-80 cm deep and were reported on all aspects and elevations. Additionally there were several human triggered avalanches reported up to size 2. Some of these were remotely triggered (from a distance).

50-90 cm of new snow fell through the last week. All this recent snow has buried a layer of surface hoar found at all elevations. In some places the surface hoar may be combined with sun crust on steep sun-exposed aspects.

A weak layer that was buried December 26 or 27 is now approximately 100 cm deep and may present as surface hoar in sheltered areas, sun crust on steep solar aspects and/or a melt freeze crust below 1700 m.

An additional layer of surface hoar buried mid December is 110-180 cm deep. Avalanche activity on this layer has tapered off, but there is still concern for heavy loads to step down to this layer. A crust from late November is now over 180 cm deep. Concern for this layer is limited to rocky or variable snowpack depth areas in the alpine where it most likely exists as a combination of facets and crust.

• Be alert to conditions that change with elevation and wind exposure.
• Avoid freshly wind loaded terrain features.
• Be aware of the potential for large avalanches due to the presence of a persistent slab.
• Storm slabs in motion may step down to deeper layers resulting in large avalanches.