Bollettino valanghe

Kootenay Boundary

Mar 6, 2019Avalanche Canada
Vedi sulla mappa
Archiviato · scaduto 8 years ago

Pericolo valanghe

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

In sintesi

Wind slabs may be reactive in the alpine. The persistent slab problem still exists at lower elevations and is best controlled by diligent group management and terrain travel.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–2
    Continuing strong wind has produced touchy wind slabs in lee and cross-loaded terrain features. The most suspect slopes will be near ridges on south, west, and north aspects, as the wind has been blowing from the east.

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely
    Dimensione
    1–2
    Two layers of weak surface hoar and/or a crust are buried 40 to 80 cm. These layers have recently been the most active between 1700 m and 2200 m and on southwest to southeast aspects. The problem is best controlled with appropriate group management.

Confidence

High -

Weather Forecast

TUESDAY NIGHT: Increasing clouds, moderate southeast wind, alpine temperature -7 C.WEDNESDAY: Cloudy with light snowfall, trace accumulation, light to moderate southeast wind, alpine temperature -9 C.THURSDAY: Cloudy with snowfall, accumulation 10 cm, moderate southwest wind, alpine temperature -10 C.FRIDAY: Cloudy with light snowfall, accumulation 1 to 3 cm, light to moderate northwest wind, alpine temperature -10 C.

Avalanche Summary

Small (size 1) wind slab avalanches were reported on Monday, being triggered by skiers.Also on Monday, a small (size 1) persistent slab avalanche was triggered by a skier. It released on the mid-February layer described in the Snowpack Summary. It was between 20 and 50 cm deep, on a south aspect, and at 2100 m. Similar avalanches have been triggered recently, such as this one.

Snowpack Summary

Strong east wind has scoured the snow surface in exposed terrain and produced wind slabs in lee and cross-loaded terrain features. In sheltered areas, soft snow may still be found. A melt-freeze crust likely prevails on southerly slopes.Two layers of weak and feathery surface hoar crystals are buried in the snowpack between 40 and 80 cm deep, which were buried mid-February and early-February. The layers may be associated with a melt-freeze crust on southerly aspects. These layers remain reactive in snowpack tests and have produced sporadic avalanches in the region over the past week.

Regioni coperte