Bollettino valanghe

Sea To Sky

Mar 18 – 19, 2012Avalanche Canada
Vedi sulla mappa
Archiviato · scaduto 15 years ago

Pericolo valanghe

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

In sintesi

Check out the latest Forecaster's Blog post below.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    1–6
    Wind slabs lurk below ridges, behind terrain features and in gullies. They may be buried by new snow, making them hard to spot.

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely - Possible
    Dimensione
    4–8
    Persistent weaknesses still have the potential to create very large, destructive avalanches if triggered. Possible triggering mechanisms include a person/sled on a thin snowpack spot, cornice fall, or step-down avalanche.

  • Storm Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    1–6
    Recent storm snow is deep and variable, and may not have fully settled. Storm slabs may fail naturally if exposed to direct sunshine.

Confidence

Fair - Timing or intensity of solar radiation is uncertain on Monday

Weather Forecast

Monday: Mainly sunny. Cloud increasing and snowfall starting in the evening. Light winds. Tuesday: Moderate to heavy snow. Freezing level near 400m. Strong south-westerly winds.Wednesday: Scattered convective snowfall. Light winds.

Avalanche Summary

Last week was very active with natural avalanche activity, human involvements and close calls. Some were failing on the mid-February persistent weakness. The size and frequency of avalanches seems to have decreased slightly over the weekend as storm slabs and wind slabs slowly gained some strength. On Sunday, avalanches were triggered naturally and by explosives in steep, rocky terrain to size 2. Avalanche activity may increase again with solar warming on Monday, or with snow and wind on Tuesday.

Snowpack Summary

Last week, 100-180 cm storm snow fell, accompanied by strong south-easterly to south-westerly winds. Storm slabs and wind slabs now appear to be slowly gaining strength. Cornices are large and threaten slopes below. A persistent weakness, formed in mid-February, continues to produce hard, sudden planar results in snowpack tests. The likelihood of triggering this layer has gone down, but very large avalanches remain possible, which could be triggered by a shallower avalanche or cornice fall. The average snowpack depth at treeline is 350 cm.

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