Avalanche Forecast

High -

Thursday night: Clear periods. Light northwest winds, increasing.

Friday: Increasing cloud with isolated flurries and a trace of new snow, continuing overnight. Moderate to strong southwest winds. Alpine high temperatures around -11.

Saturday: A mix of sun and cloud with cloud increasing and light flurries beginning overnight. Light southwest winds. Alpine high temperatures around -8.

Sunday: Mainly cloudy with isolated flurries and a trace to 5 cm of new snow, increasing overnight. Light to moderate south winds. Alpine temperatures cooling to around -15.

Reports from the Castle area on Tuesday and Wednesday showed explosives control yielding storm slab and wind slab releases to size 2.5 (large). Most crown fracture depths were around 40 cm but some larger results were up to 80 cm deep.

Looking forward, the recent snow should begin to form a more reliable bond with the old surface as our slab problems become increasingly limited to wind-loaded areas.

The recent storm brought about 25-40 cm of new snow to the region over the early part of this week. This snow has been redistributed by moderate to strong south and southwest winds in exposed areas at higher elevations.

The recent snow buried older wind slabs and other wind-affected surfaces in open areas at all elevations. This older, wind-affected snow forms the upper part of an increasingly consolidated mid-snowpack, which overlies our weak basal snowpack. 

The bottom 30-50 cm of the snowpack consists of weak facets and crusts. Although these layers have been unreactive in recent snowpack tests and have not produced avalanche activity recently, there is the potential for them to become reactive with large loads or significant warming.

• Avoid shallow, rocky areas where the snowpack transitions from thick to thin.
• Keep your guard up at lower elevations. Wind slab formation has been extensive.
• Avoid freshly wind loaded terrain features.