Avalanche forecast

Waterton Lakes

Dec 21 – 24, 2019Parks Canada
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Archived · expired 7 years ago

Avalanche danger

Sun
Mon
Alpine
4 · High
Treeline
4 · High
Below
3 · Considerable

Highlights

The storm rages on! Wet snow and rain will continue to load the snowpack on Friday night into Saturday. This continues to be a good time to avoid avalanche terrain.

Avalanche problems

  • Persistent Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible - Likely
    Size
    2–3

    Melt freeze crusts and facets from early season snowfalls are lurking at the bottom of the snowpack. This layer may come alive again with loading form the incoming storm.

  • Storm Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Very Likely
    Size
    1–2

    The atmospheric river continues to bring heavy snowfall accompanied by 120km/h southwest winds and rain below 1700m. Snowfall amounts are uncertain on Saturday, but winds will be strong and freezing levels will remain high.

Weather Forecast

Heavy wet snow or rain will continue Friday night and possibly Saturday with 110km/h winds and freezing levels near 2000m. There is some disagreement in the weather models on how much precipitation will arrive on Friday night and Saturday with amounts between 10 and 30cm, but the main event should be over by Sunday.

Snowpack Summary

30cm of wet snow and rain has arrived with extreme northwest winds and a freezing level around 1900m, providing a shock to the snowpack. A weak crust facet combo formed in November is down 60cm, and additional crust/facet layers formed in October form the bottom of the snowpack.

Avalanche Summary

No recent natural activity has been observed but visibility is poor. You can be sure slabs are building where the precipitation has come as snow.

Confidence

Intensity of incoming weather systems is uncertain

Regions covered