Avalanche forecast

Jasper

Nov 29 – 30, 2020
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Archived · expired 6 years ago

Avalanche danger

Mon
Tue
Alpine
3 · Considerable
Treeline
2 · Moderate
Below
1 · Low

Highlights

Let the 20-30cm of new snow stabilize and make conservative decisions the next few days. There will be high consequence if you tickle a slope in the wrong spot.

Avalanche problems

  • Wind Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible - Likely
    Size
    1–2

    20cm of new snow Friday night with strong winds created wind slabs on many ridgetop features. Be cautious of local wind influences where reverse  or cross loading may have occurred.

  • Loose Dry

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

    The new snow has enough mass to warrent this problem. Give it a few days to settle particularly in steep gullies.

  • Storm Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible - Likely
    Size
    1–3

    20-30cm of new snow will require a day to bond and settle. Be patient.

Weather Forecast

Sunday will be cloudy, flurries, -11 C, and light SW winds. Monday will be flurries, 6cm of snow, -13C, and light SW winds gusting to 50km/hr. Tuesday will be sun, no snow, -15C and light West winds.

Snowpack Summary

Friday night there was 20cm of new snow and strong Westerly winds. A lot of snow got whisked away in exposed locations and powder settled into sheltered locations. The snowpack remains highly variable with either soft or wind effected surface snow. Parkers weather plot has 101cm. A crust from Nov 4 is 70cm deep and found up to 2600m.

Avalanche Summary

Saturday's explosive control at Parkers slabs resulted in two size 2.5 avalanches from the wind loaded storm snow. A few other thin slabs were noted in steep alpine terrain. The visibility was good.

Confidence

Due to the number and quality of field observations

Regions covered