Bollettino valanghe

South Columbia

Apr 22 – 23, 2017Avalanche Canada
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Archiviato · scaduto 9 years ago

Pericolo valanghe

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

In sintesi

Minimize exposure to slopes with large cornices overhead when it is cool and cloudy and completely avoid them if it is warm and/or sunny.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely - Possible
    Dimensione
    1–2
    Lingering wind slabs may still be reactive in isolated areas below alpine ridgetops.

  • Cornices

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely - Possible
    Dimensione
    2–4
    Minimize exposure to slopes with large cornices overhead when it is cool and cloudy and completely avoid them if it is warm and/or sunny.

  • Loose Wet

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–2
    Convective flurries and warm temperatures could produce loose wet avalanches in the afternoon.

Confidence

Low - Due to the number of field observations

Weather Forecast

SUNDAY: Mostly cloudy with isolated flurries / Light southwest wind / Freezing level 2000mMONDAY: Cloudy with isolated flurries / Light southwest wind / Freezing level 2000mTUESDAY: Mix of sun and cloud with isolated flurries / Light to moderate southwest wind / Freezing level 1900mNOTE: Convective flurries, which are common this time of year, can result in widely varying snowfall amounts. These spring squalls routinely drop 20+ cm of snow in one valley while the adjacent drainage remains dry. For this reason, the distribution of avalanche problems associated with new snow vary greatly within a region.

Avalanche Summary

Although not in this region, a group of six ski tourers had a significant close call near Mount Sir Sanford on Friday afternoon. Multiple people were involved in a cornice triggered size 3 persistent slab avalanche on a north aspect at approximately 2800m. The entire seasons snowpack (roughly 300 cm) slid down to glacier ice in some areas. Exposure to large overhanging cornices remains a significant concern.

Snowpack Summary

Recent new snow tree line and above has been redistributed by west and south winds. Cornices remain large and continue to become more overhanging. The middle of the snowpack is generally well settled and continues to transition into a spring melt/freeze regime except for high elevation northerly aspects. Expect the entire thickness of the snowpack to be moist or wet at lower elevations. At upper elevations a deep persistent layer consisting of facets sitting on a crust that was buried back in November has been sporadically reactive to heavy loads such as a cornice fall or the weight of a smaller avalanche running.

Regioni coperte