Bollettino valanghe

South Coast Inland

Mar 30 – 31, 2023Avalanche Canada
Vedi sulla mappa
Archiviato · scaduto 4 years ago

Pericolo valanghe

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

In sintesi

Snow and wind arrive on Friday. Amounts will vary widely throughout our region.

Seek out sheltered areas free of wind slabs and be wary of how the new snow is bonding to old surfaces.

Problemi valanghivi

  • Wind Slabs

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

    Snow that will start falling Friday will be redistributed by southwest winds. Expect reactive wind slabs. Winds from earlier this week were predominantly from the northeast, therefore you may find wind slabs on all aspects.

    There is a potential for more than expected snow to fall in our region. In areas where you see more than 15 cm accumulate, be suspect of storm slabs as their reactivity could be increased by the lack of cohesion of the surfaces that they will bury.

Confidence

Moderate

Avalanche Summary

On Tuesday there was a skier-triggered wind slab avalanche in our area. It was size 0.5 and partially buried the person but there were no injuries.

Two size-one wind slab avalanches were reported on Monday. These were skier controlled and naturally caused. They were on north-facing aspects and were at a depth of 5 cm failing on the recent snow.

Snowpack Summary

New snow falling Friday will be redistributed by southwest winds.

Below the new snow is a melt-freeze crust that exists on all aspects at treeline and below, and on solar aspects to the mountain top. On high north aspects is a mixture of decomposing dry snow and small surface hoar in isolated locations.

The mid-snowpack is generally strong but the lower snowpack is a different story.

A weak layer of sugary facets is still prominent at the base of the snowpack. Small surface avalanches and cornice falls are the most likely things to trigger this layer. However, there remains a concern for human triggering in rocky, shallow, or thin-to-thick snowpack areas at treeline and above.

Weather Summary

Thursday Night

Cloudy, trace accumulation, winds southwest 15 to 20 km/h, freezing level dropping down to valley bottom.

Friday

Cloudy, 5 to 10 cm accumulation, winds southwest 20 to 30 km/h gusting to 50, freezing level up to 1300 m.

Saturday

Cloudy, 5 to 10 cm accumulation overnight and potentially another 5 to 10 during the day, winds southwest 15 to 25 km/h, freezing levels at the valley bottom.

Sunday

Cloudy, up to 10 cm accumulation, winds variable and light, freezing level at the valley bottom.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Make observations and assess conditions continually as you travel.
  • Carefully evaluate steep lines for wind slabs.
  • In areas where deep persistent slabs may exist, avoid shallow or variable depth snowpacks and unsupported terrain features.
  • Recent wind has varied in direction so watch for wind slabs on all aspects.

Regioni coperte