Avalanche forecast

Lizard-Flathead

Mar 20 – 21, 2018Avalanche Canada
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Archived · expired 9 years ago

Avalanche danger

Thu
Fri
Alpine
2 · Moderate
Treeline
2 · Moderate
Below
2 · Moderate
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Highlights

Wind slabs at upper elevations may be reactive to human triggers, especially on leeward slopes or behind terrain features. Avoid solar slopes if the sun comes out.

Avalanche problems

  • Wind Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    1–2
    The recent snow may not bond well to underlying surfaces, especially on leeward slopes that are loaded. Dry loose sluffs may run fast and far, especially if the new snow sits on a slippery melt-freeze crust.

  • Loose Wet

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible - Likely
    Size
    1–2
    If the sun comes out on Wednesday, expect the new snow to become reactive and slide naturally.

Confidence

Moderate - Intensity of incoming weather systems is uncertain on Thursday

Weather Forecast

Wednesday: Mix of sun and cloud. Alpine high near plus 3 and freezing levels rising to 1900m. Ridgetop winds light from the South. Snow expected overnight 10-20 cm. Thursday: Periods of snow 10-20 cm with heavier amounts expected later in the day above 1300 m. Alpine high near plus 2. Ridgetop winds strong from the East. Friday: Cloudy with possible sunny breaks. Alpine temperatures near -1. Light-moderate precipitation amounts. Ridgetop winds moderate to gusty from the southwest.

Avalanche Summary

On Monday we received reports of several natural size 1.5 dry loose avalanches, and confined to the recent storm snow. No new avalanche reports submitted on Tuesday.

Snowpack Summary

Up to 12 cm of new snow fell on Monday. This new may have a poor bond to a wide variety of old snow surfaces including a melt-freeze crust on sunny aspects, or surface hoar (up to 30mm in size) and/or dry snow on north aspects above 1500-1800m.Deeper in the snowpack, the mid-December and late-November weak layers are composed of crusts and sugary facets, which are down 150-300 cm. These layers have been dormant but may be awoken by a large trigger, such as a cornice fall, or by humans traveling in thin-to-thick snowpack areas.

Regions covered