Avalanche Forecast
Regions: Little Yoho.
Up to 60cm of snow will overlie the Dec 18 surface hoar layer in the next 2 days. We expect this layer to become prime for human triggering.
Weather Forecast
Up to 20cm of new snow is expected in the lIttle Yoho region over the next 24-48 hours. Along with a NW flow with warming temps, the danger rating will remain in the considerable range.
Snowpack Summary
The main issue currently is the Dec.18 layer which is down 35-50 cm and sits on a crust/surface hoar combination at elevations below 2100 meters and on a facet/surface hoar combination at higher elevations. In places below 2100m there is a melt/freeze crust up to 10cm thick with surface hoar above. Wind slabs have been encountered in alpine areas.
Avalanche Summary
No new avalanches have been observed or reported.. Over the last few days, many features starting to slab up with wind effect have been producing "whumpfs" over the dec 18th layer at treeline and above
Confidence
Intensity of incoming weather systems is uncertain on Monday
Avalanche Problems
Persistent Slabs
The Dec 18 interface is down 35-50 cm and is producing easy to moderate results with field tests. There is likely enough load for human triggering to increase on this layer.
Aspects: All aspects.
Elevations: All elevations.
Likelihood: Likely
Expected Size: 1 - 3
Wind Slabs
Wind effect on Friday has created small wind slabs in lee alpine terrain.
Aspects: North, North East, East, South East, South.
Elevations: Alpine.
Likelihood: Possible - Likely
Expected Size: 1 - 2