Avalanche Forecast
Issued: Nov 26th, 2020 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs, Loose Dry and Persistent Slabs.
Jasper Snow Safety,
Additional snow and relentless winds will keep the hazard elevated in the alpine and Upper Treeline until we see both relax. Great skiing can be found in sheltered locations. Continue to submit to the MIN if and when you can.
Summary
Weather Forecast
Thursday evening and in to friday we can expect to see overcast skies and about 10cm of snow with winds up to 40km/h from the SW. Alpine temperatures well remain seasonably warm around -8.
Saturday will see an additional 5cm with cooling temperatures -13 with appearances from the sun
Snowpack Summary
The snowpack is highly variable depending on location. Height of snow at Parkers is ~100cm at treeline. The Nov.4 crust found up to 2600m, and is ~70cm deep. Test results today showed hard results CTH23 failing on the basal weakness. Continued wind slab developing on N and E aspects ridge top down into treeline. Basal layers continue to weaken.
Avalanche Summary
A field team was in the Hilda peak area today and noted 1 loose dry avalanche from steep N facing alpine terrain and 1 Na Sz1.5 wind slab in the boundary slide paths. good visibility throughout the day.
Confidence
Problems
Wind Slabs
New snow and strong winds are contentiously building fresh wind slabs. Watch for freshly buried wind slabs with the incoming snow.
- Use caution in lee areas. Recent wind loading has created wind slabs.
- If triggered the wind slabs may step down to deeper layers resulting in larger avalanches.
Aspects: North, North East, East, South East, North West.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Loose Dry
More snow in the forecast means more snow on canyon walls and above ice climbs, Be aware of overhead and changing condition.
- 874
- If triggered dry loose point releases can form deeper deposits in terrain traps.
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Persistent Slabs
Pockets of previous wind deposited snow overlies the Nov 4 rain crust. Test results are mixed on this layer. Small incremental loads will continue to test this layer
- Pockets of persistent slabs linger on alpine lee features.
Aspects: North, North East, East, South East, West, North West.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Nov 27th, 2020 4:00PM
