Avalanche Forecast
Avalanche Bulletin - Little Yoho
Avalanche conditions continue to be very tricky. The snowpack is dangerous and avoiding avalanche terrain is important right now. Avalanches have been occurring in low angled terrain. Incremental loading will keep the hazard elevated.
Avalanche Problem 1: Persistent Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Travel and Terrain Advice
- Be wary of slopes that did not previously avalanche.
- Avoid all avalanche terrain.
Avalanche Problem 2: Wind Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Strong winds last Tuesday night created widespread wind effect in most areas above treeline. Hard wind slabs exist in the alpine lees.
Travel and Terrain Advice
- If triggered the wind slabs may step down to deeper layers resulting in large avalanches.
Avalanche Summary
No new avalanches were observed or reported today - but we continue to see evidence of the large avalanches that occurred over the past few days. Today on Hector Shoulder trees we could see several deep fractures some of which occurred on low angle terrain.
Snowpack Summary
Strong SW winds in the past 48 hrs created widespread wind effect and hard windslabs at treeline and above. The upper half of the snowpack is a dense slab overlying three weak layers (Jan 16, Jan 6, & Dec 15) that are a mix of facets, crusts and surface hoar down 75-125cm in the snowpack. These layers have been producing very large avalanches.
Weather Forecast
Expect some flurries and the temperatures to drop the Arctic air pushes into the East side of the Rockies Tuesday night with light Northerly winds. On Thursday, temperatures will be around -15C and we will return to a Westerly flow with light flurries may resume Thursday evening.
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A 100-125cm dense slab of January storm snow overlies three weak layers in the mid snowpack: Jan 16, Jan 6, and Dec 15. All are a mix of sun crust, surface hoar and facets depending on the aspect and elevation. These layers could easily be triggered.