Bollettino valanghe

Lizard-Flathead

Mar 16 – 17, 2025Avalanche Canada
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Archiviato · scaduto 2 years ago

Pericolo valanghe

Tue
Wed
Alta quota
3 · Marcato
Limite del bosco
3 · Marcato
Sotto il limite
3 · Marcato

In sintesi

Stick to simple or non-avalanche terrain while the storm snow settles and stabilizes.

Avoid overhead hazard especially during periods of sun.

Problemi valanghivi

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    2–3

    A persistent weak layer of surface hoar or facets is buried 80 to 150 cm. This layer remains a concern on upper-elevation northerly through easterly slopes.

  • Storm Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely - Very Likely
    Dimensione
    1–2.5

    Up to 60 cm of recent snow has formed widespread storm slabs that need a few days to bond. The new snow will be especially reactive on wind-loaded slopes and on sunny slopes during periods of solar radiation.

Confidence

Moderate

Avalanche Summary

Over the last three days, explosive control in the Lizard Range has produced numerous storm slabs up to size 2 (large). Last Thursday, a widespread natural cycle was observed in the Lizard Range with storm slabs up to size 2.5, and explosive control also produced numerous small storm slabs.

Snowpack Summary

Up to 60 cm of recent snow has built widespread storm slabs in the region, with another 5 to 15 expected overnight Sunday. Due to southwesterly winds, slabs are expected to be especially reactive on lee north through east facing slopes near ridgetops. In most areas, the storm snow rests on a melt-freeze crust, except for high elevation north and east facing slopes.

A persistent weak layer of surface hoar or facets from late January is buried 100 to 150 cm. This layer triggered large avalanches earlier in March. The greatest concern for this weak layer is on upper-elevation northerly and easterly slopes. The lower snowpack is generally well-settled and strong.

Weather Summary

Sunday Night

Cloudy, with 5 to 15 cm of snow. 30 to 40 km/h southwest ridgetop wind. Treeline temperature -8 °C.

Monday

Mostly cloudy, with a few sunny breaks. 15 to 30 km/h southwest ridgetop wind. Treeline temperature -3 °C. Freezing level rising to 1500 m.

Tuesday

A mix of sun and cloud. 15 to 30 km/h west ridgetop wind. Treeline temperature -4 °C. Freezing level rising to 1400 m.

Wednesday

Sunny. 25 to 40 km/h southwest ridgetop wind. Treeline temperature -2 °C. Freezing level rising to 1700 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Storm slabs in motion may step down to deeper layers resulting in large avalanches.
  • Even brief periods of direct sun could produce natural avalanches.

Regioni coperte