Avalanche Forecast
Issued: Jan 5th, 2023 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs, Persistent Slabs and Deep Persistent Slabs.
MW,
Avalanche Canada
Increasing winds will promote wind slab development at tree line and above. These fresh wind slabs sit over a generally weak, faceted snowpack.
Summary
Confidence
Moderate
Avalanche Summary
A size 2.5 natural avalanche was observed off the north face of Mt. Kitchener on Thursday, Jan 5. Unable to identify the type of avalanche or failure plane due to visibility.
Snowpack Summary
Widespread surface hoar growth throughout the Jasper region. The top 20-40cm has a varying density with pockets of wind slab developing in exposed terrain at treeline and above. The upper snowpack sits over the Dec 17 persistent weak layer buried 30-40cm deep. The lower snowpack is heavily faceted with depth hoar present at the base of the snowpack. The snowpack ranges from 50-120cm.
Weather Summary
Friday
Mainly cloudy with isolated flurries.
Precipitation: Trace.
Alpine temperature: High -6 °C.
Ridge wind southwest: 15 km/h gusting to 45 km/h.
Freezing level: 1400 metres.
Saturday
Mainly cloudy.
Precipitation: Nil.
Alpine temperature: Low -11 °C, High -6 °C.
Ridge wind southwest: 15-30 km/h.
Freezing level at valley bottom.
Sunday
Mainly cloudy with isolated flurries.
Precipitation: Trace.
Alpine temperature: Low -11 °C, High -7 °C.
Ridge wind southwest: 10 km/h.
Freezing level at valley bottom.
Terrain and Travel Advice
- The trees are not a safe haven, travel at treeline requires expert knowledge and diligence.
- Make conservative terrain choices and avoid overhead hazard.
Problems
Wind Slabs
Aspects: North, North East, East, South East, South, West, North West.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Persistent Slabs
A varied slab sits over the December 17th facet layer, 25-50cm down. This problem is significant at all elevations but most reactive in open tree line features and in the alpine where you can expect a stiffer, likely more reactive slab. If triggered, it is possible to step down to the deep persistent facets combo near the ground.
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Deep Persistent Slabs
The bottom of the snow pack is inherently weak with well developed Facets and Depth Hoar. Avalanches initiating in the upper snowpack are likely to step down to this layer and gain significant mass.
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Valid until: Jan 6th, 2023 4:00PM
