Avalanche Forecast

Issued: Nov 27th, 2020 4:00PM

The alpine rating is considerable, the treeline rating is considerable, and the below treeline rating is low. Known problems include Wind Slabs, Persistent Slabs and Loose Dry.

Jasper Snow Safety,

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Jasper.

Avalanche control planned for Saturday with intermittent closures of up to 1.5 hr to be expected between Parkers Summer and Big Bend. Saturday will be a great time to look for sheltered areas and enjoy the new snow. Beware of wind slabs. "JSS"

Summary

Weather Forecast

Expecting 20 cm of fresh snow with strong southwest winds and mild temperatures throughout the night. On Saturday the skies are expected to clear with alpine high of -9 and strong northwest winds.

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 yesterday showed hard results CTH23 failing on the basal weakness. Continued wind slab developing on N and E aspects ridge top down into treeline.

Avalanche Summary

No patrol today, no avalanches reported.

Confidence

Forecast snowfall amounts are uncertain on Saturday

Problems

Wind Slabs

An icon showing Wind Slabs

New snow and strong winds are building up wind slabs and possibly overloading the weaker layers below.

  • If triggered the wind slabs may step down to deeper layers resulting in larger avalanches.
  • Use caution in lee areas. Recent wind loading has created wind slabs.

Aspects: North, North East, East, South East, North West.

Elevations: All elevations.

Likelihood

Possible

Expected Size

1 - 2

Persistent Slabs

An icon showing 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

Possible

Expected Size

1 - 3

Loose Dry

An icon showing Loose Dry

More snow in the forecast means more snow on canyon walls and above ice climbs, Be aware of overhead and changing condition.

  • If triggered dry loose point releases can form deeper deposits in terrain traps.
  • 874

Aspects: North, North East, East, North West.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 1.5

Valid until: Nov 28th, 2020 4:00PM

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