Bollettino valanghe

Northwest Coastal

Mar 25 – 26, 2019Avalanche Canada
Vedi sulla mappa
Archiviato · scaduto 8 years ago

Pericolo valanghe

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

In sintesi

Small loose wet avalanches may gather mass, become much larger, and run farther into low angle terrain than expected.

Problemi valanghivi

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely - Possible
    Dimensione
    1.5–2.5
    Human triggering of large persistent slab avalanches is most likely in rocky, alpine terrain with a shallow or highly variable snowpack depth.

  • Loose Wet

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–2
    This problem is more likely at lower elevations where there was a weak or no overnight re-freeze. Sunshine and air temperatures above 0 C can rapidly increase the likelihood of triggering loose wet avalanches.

Weather Forecast

MONDAY NIGHT: Clear / Light, northeasterly winds / Alpine low 1 C / Freezing level 1500 m.TUESDAY: Sunny with increasing clouds afternoon / Light, southerly winds / Alpine high 3 C / Freezing level 1500 m.WEDNESDAY: Mix of sun and cloud / Light, easterly winds / Alpine high 3 C / Freezing level 1500 m.THURSDAY: Sunny / Light, southwesterly winds / Alpine high 3 C / Freezing level 1500 m.

Avalanche Summary

Natural avalanche activity has tapered off but concern remains for human triggering loose wet avalanches at lower elevations and  persistent slab avalanches on northerly aspects in the alpine.

Confidence

Moderate - Due to the number of field observations

Snowpack Summary

At upper elevations, 50-100 cm of well settled snow overlies weak facets (sugary snow) that were buried around March. 10th. which is currently the primary layer of concern for human triggering persistent slab avalanches.Not much further below the March 10th interface is a second weak layer of facets buried on February 19th. Recent loose wet and slab avalanches have been observed gouging into this faceted snow and entraining additional mass.The prolonged warm spell has transitioned sun exposed slopes in the alpine and all aspects at treeline and below towards becoming isothermal (0 C throughout the snowpack). In these areas that have entered spring conditions, the avalanche hazard will fluctuate greatly depending on the strength of the overnight freeze and how quickly the snowpack is warmed up each day. Check out this guide to managing avalanche hazard during spring conditions HERE.

Regioni coperte