Avalanche Forecast

Issued: Feb 1st, 2021 4:00PM

The alpine rating is considerable, the treeline rating is considerable, and the below treeline rating is moderate. Known problems include Storm Slabs and Loose Dry.

Deryl Kelly,

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Periodic afternoon closures expected on Highway 93N,Tuesday. Expect delays of up to 2 hours for Avalanche Control.

Plan your travel accordingly.

Summary

Weather Forecast

Overnight: Continued flurries. Accumulation: 10 to 14 cm. Alpine temperature: High -3 °C. Ridge wind south: 15-35 km/h. Freezing level: 1800m.

Tuesday: Cloudy with sunny periods and isolated flurries. Risk of a thundershower? Precipitation: Trace. Alpine temperature: High -4 °C. Mostly light ridge wind occasionally gusting to 45 km/h.

Snowpack Summary

Up to a total of 30cm of storm snow accumulated by Tuesday morning. Expect to find new wind slab on lee ridge-top features and below. The new snow will overlie previously wind affected surfaces in non-sheltered areas in the alpine and below as well as widespread surface facets. Strong mid-pack in deeper areas overlies supportive basal layers.

Avalanche Summary

Patrol teams reporting variable snowfall through the forecast region. Poor visibility and no new avalanche activity reported or observed.

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Confidence

Forecast snowfall amounts are uncertain on Tuesday

Problems

Storm Slabs

An icon showing Storm Slabs

Likelihood and size dependent on wind effect and precip amounts

  • Use caution in lee areas. Recent wind loading have created wind slabs.
  • Minimize exposure during periods of heavy loading from new snow and wind.

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Possible - Likely

Expected Size

1 - 2.5

Loose Dry

An icon showing Loose Dry

Size and likelihood dependent on precip amounts. Previous surface faceting could make this problem more reactive.

  • Avoid travelling on ledges and cliffs where sluffing may have severe consequences.
  • Be careful of loose dry power sluffing in steep terrain.

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Likely

Expected Size

1 - 2

Valid until: Feb 2nd, 2021 4:00PM

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