Lawinenlagebericht

Lizard-Flathead

Mar 2, 2017Avalanche Canada
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Archiviert · abgelaufen 10 years ago

Lawinengefahr

Thu
Fri
Hochgebirge
4 · Gross
Waldgrenze
3 · Erheblich
Unterhalb
3 · Erheblich
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Kernpunkte

Up to a metre of storm snow has fallen since Saturday and the incoming warm front will bring rising temperatures and strong winds. The perfect recipe for a widespread avalanche cycle.

Lawinenprobleme

  • Storm Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely - Very Likely
    Größe
    1–3
    Reactive storm slabs continue to build and are primed for rider triggering. Looming cornices exist and failures could initiate slabs on the slope below.

  • Deep Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Unlikely - Possible
    Größe
    2–4
    There have been two natural deep persistent slab releases in the past week. Both of these avalanches were on northeast aspects in the alpine, and released to size 3 or larger.

Snowpack Summary

Another 36 cm overnight of low density storm snow with accumulations up to 93 cm since Saturday. Strong ridgetop winds are likely transporting the new snow onto leeward slopes, building thicker and stiffer slabs. This new snow continues to bury a plethora of old snow surfaces including surface hoar, old wind slab and a sun crust on solar aspects and it also sits above a thick rain crust below 1900 m. Isolated basal weaknesses may still exist in shallow snowpack areas. These weak areas appear to be on north-northeast aspects in the alpine.

Confidence

Moderate - Forecast snowfall amounts are uncertain

Weather Forecast

A warm front of an organized low pressure system will track across the region bringing rising freezing levels, more snow and strong winds. Conditions will remain unsettled through the forecast period. Enhanced snow amounts may be greater than forecast for Saturday/ Sunday.Thursday: Cloudy with snow 5-15 cm. Ridgetop winds strong from the SW, alpine temperatures near -3 and freezing levels 1200 m.Friday: Periods of snow 5-20 cm. Ridgetop winds light gusting to 80 km/hr from the SW, alpine high of -3 and freezing levels 1300 m.Saturday: Snow 5-10 cm. Ridgetop winds generally light with strong gusts. Alpine temperatures high of -2 and freezing levels 1300 m.

Avalanche Summary

On Wednesday, the region saw widespread natural and explosive controlled avalanche activity up to size 2. These avalanches failed within the recent storm snow mostly from N-NE aspects above 1950 m. Natural Loose dry avalanches up to size 1.5 were also reported from all aspects and elevations.

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