Bollettino valanghe

Jasper

Mar 30 – 31, 2016Parks Canada
Vedi sulla mappa
Archiviato · scaduto 11 years ago

Pericolo valanghe

Fri
Sat
Alta quota
4 · Forte
Limite del bosco
3 · Marcato
Sotto il limite
3 · Marcato
Apri la mappa completa

In sintesi

Clear skies and warm temperatures are forecast and with them a rapid and dangerous increase in avalanche activity. Stick to shallow angles with no overhead hazard.

Problemi valanghivi

  • Cornices

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    1–2
    Increase occurrence of cornice failures are being noted. It can act as a large trigger initiating deep weaknesses plus their sheer mass, whether or not it initiates an avalanche, would be like being hit by a car.

  • Loose Wet

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    1–2
    This problem will increase with forecasted warm temps and intense solar radiation. The danger rating will rapidly increase particularly on thin snowpack zones and sun facing slopes. Loose avalanches can initiate larger avalanches below.

  • Deep Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    1–3
    This problem is becoming more active. When triggered, it will be big with serious consequences. Warm and sunny conditions will increase this danger. Steep sun facing rocks, cornice failures, and loose avalanches from above are waking up this problem.

Weather Forecast

The North Westerly flow will continue as a body of warm air from the Pacific approaches. The freezing level (FL) overnight will not drop much below zero at treeline elevation and below allowing the snowpack to keep its heat. On Thursday and Friday FL will increasing to 2700m. With clear skies for Thursday the air and snowpack will rapidly heat up.

Snowpack Summary

Temperature crusts will loose their strength over the next few days with poor overnight recovery. Greater snowpack depths exists closer to the Icefields which offer more support and add strength to the snowpack. Several weaknesses persist in the lower portion of the snowpack and cornices are large. The snow at ground level is  very weak.

Avalanche Summary

Avalanche activity will reach dangerous levels by mid afternoon if the weather forecasts holds true.  Cornices can be expected to collapse and are are of sufficient size to trigger large avalanches.

Confidence

Freezing levels are uncertain on Thursday

Regioni coperte