Avalanche Forecast
Avalanche Bulletin - Little Yoho
Unexpectedly heavy snow in Little Yoho combined with strong winds produced an avalanche cycle Tuesday. The snowpack is expected to be touchy and tricky for a while. Make conservative choices.
Avalanche Problem 1: Wind Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Travel and Terrain Advice
- Pay attention to overhead hazards like cornices which could trigger slabs.
- Be careful with wind loaded pockets, especially near ridge crests and roll-overs.
Avalanche Problem 2: Persistent Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
As the new snow increases the load over the March 15 crust on solar aspects we may start to see avalanche activity on this layer. If the facets below the crust also fail, larger propagations will be possible.
Travel and Terrain Advice
- Watch for signs of instability such as whumpfing, or cracking.
- Recent snow may be more sensitive to human triggering on solar aspects where it sits on sun crust
Avalanche Summary
Numerous avalanches to size 2.5 were noted on Mt Field and Emerald Pk
Snowpack Summary
Moderate to strong SW winds are creating wind slabs in alpine and treeline areas and beginning to over load cornices. 40+ cm of recent snow sits over a melt freeze crust on solar aspects with some facets at the crust interface. So far the lower snowpack has few concerns except for basal facets in shallow areas.
Weather Forecast
More light snow and strong winds, with moderately cool temperatures are forecast. More snow is expected Friday.
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Wind slabs and wind effect will increase on Tuesday with the arrival of new snow and continued W winds. We expect to see increased natural avalanche activity, especially as cornices get over loaded and fail, and human triggering will be likely.