Avalanche forecast

Jasper

Nov 8 – 9, 2020
View on map
Archived · expired 6 years ago

Avalanche danger

Mon
Tue
Alpine
2 · Moderate
Treeline
1 · Low
Below
No rating

Highlights

Early season hazards are very present at the moment. Reverse loading could have built wind slabs on the southerly aspects.

Avalanche problems

  • Wind Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Unlikely - Possible
    Size
    1–2.5

    On Nov 4th the zone received 10-30cm of warm snow with S shifting N winds creating some slab conditions. The season is just beginning so treat all slopes conservatively until more information is gathered.

  • Loose Dry

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Unlikely - Possible
    Size
    1–1.5

    The storm snow on North steep aspects is lacking cohesion and can result in loose dry avalanches.

Weather Forecast

Sunday: Sunny with cloudy periods. Alpine temperature: High -9 °C. Ridge wind northeast: 10 km/h. Freezing level at valley bottom.

Monday: Cloudy with sunny periods. Alpine temperature: Low -13 °C, High -10 °C. Ridge wind west: 15 km/h. Freezing level at valley bottom.

Snowpack Summary

Treeline has a snowpack of 30-40cm with overall supportive travel. 10-15cm of recent snow has been redistributed from moderate northerly winds and overlies a rain crust which exists up to 2200m.  Winds have formed wind slabs and wind effect on S through E aspects at ridge top. Below treeline the snow remains below threshold values.

Avalanche Summary

There were no results from Thursday's explosive control on Parkers slabs. Friday's patrol noted one size 2.5 wind slab in the alpine on large east facing rock slab, It appeared to be cornice triggered, started loose and resulted in a slab lower down. Several other size 2 wind slabs were observed  in alpine E aspects that near ridge tops.

Confidence

Due to the number of field observations

Regions covered