Avalanche Forecast
Issued: Nov 24th, 2019 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs and Deep Persistent Slabs.
Conrad Janzen,
Parks Canada
Natural avalanche activity will decrease on Monday but human triggering of wind slabs will remain likely. Use caution or avoid fresh wind loaded areas and narrow gullies until the new snow has had a chance to settle and bond.
Summary
Weather Forecast
Winds will stay out of the west but start to decrease on Monday to the moderate range. Temperatures will be a few degrees cooler than Sunday, with treeline temperatures between -5 and -10 C. No new snow is expected. Things continue to cool down and clear up on Tuesday.
Snowpack Summary
10-20 cm of new snow with strong W winds have formed new touchy wind slabs at ridge tops and in open alpine areas. The Nov 8 crust is down 20-30 cm and is present up to ~2400 m. The lower snowpack is a mix of facets and the Oct crusts. Snowpack depths at treeline range from 60-90 cm with up to 140 cm in lee areas.
Avalanche Summary
Sunday had numerous natural, skier triggered and explosive triggered small wind slabs up to size 2. These mostly occurred in lee areas near ridge tops and in the high alpine, though one was observed running to below treeline on the Pilsner Pillar ice climb. Triggering these will remain likely into Monday.
Confidence
Problems
Wind Slabs
Fresh wind slabs have formed in lee areas near ridge tops and in open alpine areas. Skier or climber triggering of these wind slabs will remain likely into Monday.
- Use caution in lee areas. Recent wind loading have created wind slabs.
- If triggered the wind slabs may step down to deeper layers resulting in large avalanches.
Aspects: North, North East, East, South East, South.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Deep Persistent Slabs
The lower snowpack consists of weak facets and crusts. With the recent snow load there is potential for avalanches to step down to this deeper persistent layer.
- Convex features and steep unsupported slopes will be most prone to triggering.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Nov 25th, 2019 4:00PM
