Avalanche forecast

Jasper

Apr 7 – 8, 2013Parks Canada
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Archived · expired 13 years ago

Avalanche danger

Tue
Wed
Alpine
2 · Moderate
Treeline
1 · Low
Below
1 · Low
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Highlights

Daytime and nightime temperatures are staying cooler. Winds have been variable directions so assess for reverse loading patterns on a buried smooth temperature crust. Tuesday's forecasted sun may briefly increase danger rating in the afternoon.

Avalanche problems

  • Cornices

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Unlikely - Possible
    Size
    1–3
    These heavy features can fall unexpectedly triggering deep large avalanches. Select your route to avoid these features. Probability of cornice failure increases with daytime heating and sun.

  • Loose Wet

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    1–2
    This is less of a concern with cooler temperatures but increases its probability if the sun comes out. New snow rests on a buried smooth temperature crust particularly on South aspects. The surface snow can quickly become wet and active with heat.

Weather Forecast

Sunday evening freezing level will be valley bottom rising to 1300m on Monday and light East winds. Expect a good freeze Monday night. Tuesday will be sunny, light Westerlies, with rising afternoon freezing level. Tuesday night will have less overnight freeze, 100km/hr Westerlies at 3000m, and moderate precipitation into Wednesday.

Snowpack Summary

Melt freeze crust below treeline provides stability above a wet and unconsolidated snowpack. Watch for daytime heating breaking the crust down and increasing the danger. Alpine cornices are large and looming. The snowpack is supportive above treeline with a light dusting of snow over a temperature crust particularly on South aspects.

Avalanche Summary

No new avalanches reported on Sunday. On Friday, several loose avalanches were observed from steep rock cliffs. Steep, Southerly aspects below 1600m are mostly melted out.

Confidence

The weather pattern is stable on Monday

Regions covered