Avalanche Forecast
Avalanche Bulletin - Little Yoho
Avalanches are continuing to run on the Halloween persistent weak layer. Conservative route choices are in order.
Avalanche Problem 1: Persistent Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Travel and Terrain Advice
- Use conservative route selection, choose moderate angled and supported terrain with low consequence.
Avalanche Problem 2: Wind Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Fresh snow and mod to strong SW winds will have created fresh wind-slabs in the alpine.
Travel and Terrain Advice
- Use caution in lee areas. Recent wind loading has created wind slabs.
Avalanche Summary
Warm temperatures and rain below 1900 m have weakened the snow-pack. Lake Louise Ski Hill triggered a bunch of avalanches up to size 2.5 with explosives on Sunday and there was a boarder triggered size 2.5 avalanche in Westbowl. Avalanches were running on the Halloween layer near the base of the snow-pack.
Snowpack Summary
Recent fresh snow and strong south and south west winds will have created fresh wind-slabs in the high alpine. At tree-line and below a warm and rain soaked upper pack sits over the Halloween crust which is 20-40 cm above the ground. The main weakness in the snowpack remains the weak facets associated with the Halloween crust.
Weather Forecast
There will be a cooling trend with freezing levels lowering to around 1200 m on Monday. Light snow expected throughout the day on Monday with accumulations at treeline up to 10 cm. Continued unsettled weather on Tuesday.
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New snow and rain below 1900 m have added extra weight to the snowpack. The Halloween persistent weak layer remains active as indicated by fresh avalanche activity reported at Lake Louise (see avalanche details).