Bollettino valanghe

Lizard-Flathead

Dec 14 – 15, 2019Avalanche Canada
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Archiviato · scaduto 7 years ago

Pericolo valanghe

Mon
Tue
Alta quota
3 · Marcato
Limite del bosco
2 · Moderato
Sotto il limite
1 · Debole
Apri la mappa completa

In sintesi

Flurries have steadily accumulated new snow in the past 24 hours. This combined with moderate west winds have made wind slabs at upper elevations the primary concern.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    1–2

    Triggering wind slab avalanches is likely at higher elevations where the wind has blown fresh snow into reactive slabs.

  • Persistent Slabs

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

    The likelihood of triggering a large avalanche on one of the crusts and weak layers in the lower snowpack is gradually reducing, but the consequence is high.

Confidence

Moderate - Recent weather patterns have resulted in a high degree of snowpack variability within the region.

Weather Forecast

FRIDAY NIGHT: Scattered flurries, 30 km/h wind from the west, alpine high temperatures around -4 C.

SATURDAY: Mostly cloudy, light wind from the northwest, alpine high temperatures around -6 C.

SUNDAY: Mix of sun and cloud, light wind from the northwest, alpine high temperatures around -8 C.

MONDAY: Mix of sun and cloud, light wind from the west, alpine high temperature -8 C.

Avalanche Summary

Recent avalanche activity has primarily been limited to small wind slab avalanches (size 1) triggered with explosives. On Thursday there was a report of a size 2.5 storm slab avalanche on a northeast aspect in the alpine, which scoured down to a crust near the base of the snowpack. 

Snowpack Summary

New snow and wind has formed fresh wind slabs at upper elevations. In sheltered areas 30-40 cm of snow from last weekend is gradually settling. Crust layers from November and October can be found 40-100 cm below the surface. These layers produced large avalanches with explosive triggers last weekend, but since then have appeared to gain strength. Large avalanches on these layers may still be possible to trigger in steep rocky terrain. Snowpack depths range between 50-100 cm at higher elevations and taper rapidly below treeline.

Regioni coperte