Bollettino valanghe

Purcells

Mar 25 – 26, 2021Avalanche Canada
Vedi sulla mappa
Archiviato · scaduto 6 years ago

Pericolo valanghe

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

In sintesi

Watch for wind slabs and cornices in steep alpine terrain, and be careful on sunny slopes when the surface is moist or wet.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–1.5

    Steady wind from the southwest and northwest has likely left some unstable slabs on steep alpine slopes.

  • Cornices

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely - Possible
    Dimensione
    1.5–2.5

    Where cornices exist they pose a threat both from the potential to collapse under your feet (or machine) and from the potential to send large chunks of snow far down a slope.

Confidence

High -

Weather Forecast

THURSDAY NIGHT: Clear skies, 30 km/h northwest wind, treeline temperatures drop to -8 C.

FRIDAY: Sunny in the morning then increasing cloud in the afternoon, 30-40 km/h west wind, treeline temperatures around -5 C.

SATURDAY: Mix of sun and cloud, 30 km/h southwest wind, freezing level climbing to 1800 m, treeline temperatures around -2 C.

SUNDAY: Scattered flurries with 5-15 cm of snow, 40-50 km/h southwest wind, freezing level climbing to 1800 m, treeline temperatures around -2 C.

Avalanche Summary

Recent avalanche activity has primarily been small (size 1-1.5) wind slab avalanches, dry loose sluffs, and cornice falls. These have occured on a range of aspects, and will continue to be possible on slopes that have recently been wind loaded.

Snowpack Summary

The surface consists of 15-25 cm of low density snow on shady sheltered slopes, with sun exposed slopes have a surface crust. Gusty westerly winds have formed some isolated wind slabs in lee features. A total of 20-40 cm of recent snow is settling above a widespread crust from the mid-March warm spell, and perhaps some small surface hoar on isolated north-facing slopes. Deeper layers are strong and have been unreactive over the past few weeks.

Terrain and Travel

  • Be alert to conditions that change with elevation, aspect and exposure to wind.
  • Carefully evaluate steep lines for wind slabs.
  • Minimize your exposure time below cornices.
  • Minimize exposure to sun-exposed slopes when the solar radiation is strong.

Regioni coperte