Avalanche Forecast

Low - Uncertainty is due to how the snowpack will react to the forecast weather.

Saturday night: light west winds with a above freezing layer between 1300m and 2500m. no new snow expected.

Sunday: mix of sun and clouds with a above freezing layer between 1500m and 2500m.Light west winds.

Monday: light precipitation bringing up to 5cm of snow. Light west winds shifting to Moderate northwest. Freezing levels rising to 1300m.

Tuesday: a mix of sun and cloud with the possibility of some light flurries bringing trace amounts of snow. Freezing levels rising to 1500m. Light northwest winds.

On Thursday two size 1 persistent slab avalanches were triggered by skiers on east aspects at treeline. In the southern part of the neighboring South Columbia region a vehicle triggered a size 3 avalanche at treeline running on the early December crust. This avalanche was on a northeast aspect and ran full path. 

On Wednesday a skier triggered a size 2 persistent slab avalanche just below a ridge top at 2100m on a northeast aspect. This avalanche ran on the late January surface hoar.

On Tuesday explosives triggered persistent slab avalanches up to size 3 on northeast aspects at 2200m. These avalanches ran on the late January surface hoar and showed substantial propagation.

On Monday numerous persistent slab avalanches to size 2.5 were observed in the treeline and below. triggers included cornice falls, ski cuts and naturals. Avalanches were observed on all aspects.

A crust has formed on all aspects and elevations except high north terrain. This crust could soften throughout the day with rising temps and sun exposure. Recent strong wind from the southwest have formed wind slabs in exposed terrain at higher elevations. 

The January 30 interface is now typically down 20-40cm and consists of a melt-freeze crust at lower elevations and on solar aspects extending into the alpine and surface hoar in sheltered areas at and below treeline.  

The mid-January interface is now down around 40-70 cm and consists of a crust, facets, and/or surface hoar.   

The early-December crust/facet persistent weak layer is buried down 100-200 cm. It had been responsible for significant avalanche activity in this region during the first half of January but is now considered dormant. See this forecaster blog on how to manage this layer as it may come into play again later this season.

• Be aware of the potential for large avalanches due to the presence of buried weak layers.
• Look for signs of instability: whumphing, hollow sounds, shooting cracks, and recent avalanches.
• Back off slopes as the surface becomes moist or wet with rising temperatures.
• Avoid sun exposed slopes when the solar radiation is strong, especially if snow is moist or wet
• Be careful as you transition into wind affected terrain.