Boletín de aludes

Jasper

Dec 7 – 8, 2024Avalanche Canada
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Archivado · caducó 2 years ago

Peligro de aludes

Mon
Tue
Alta montaña
3 · Notable
Límite del bosque
3 · Notable
Bajo el límite
1 · Débil
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Lo esencial

The Icefields Parkway will be closed from Parkers to Big Bend for avalanche control on Saturday December 7th from noon until 4pm. Check for updates on 511.alberta.ca

Incoming snowfall combined with strong winds will create wind slabs in leeward areas. Avalanches may have the potential to step down to deep persistent instabilities

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    1–2.5

    Incoming snow and increased southwest winds will develop a windslab in leeward features over the next 24 hours.

  • Deep Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    1–2.5

    This layer is most reactive where it has been loaded by wind transported snow. This problem includes the Oct 18 crust and the Nov 8th crust and surface hoar. There’s uncertainty around its distribution and sensitivity.

Confidence

Moderate

Avalanche Summary

At Marmot Basin size 2 avalanches failing on the facets above the October 18 MFcr have been produced by large explosives in the alpine on E-S aspects.

Snowpack Summary

Up to 20cm of new snow will sit on a thin melt freeze crust that developed from the previous warm temperatures up to 2200m. The Nov 8th crust and facets are down 30-40 cm at tree-line and below. We have also found surface hoar (6mm) down 70cm at 2500m. The October crust is widespread and is found near the base of the snow pack with facets above and below. Snow depth is roughly 80 cm at treeline and tapers rapidly below.

Weather Summary

Saturday

Cloudy with flurries accumulating up to 15 cm.

Alpine high of -3 °C.

Southwest winds of 15 km/h gusting to 65 km/h at ridgetop.

Freezing level: 1500 metres.

Sunday

A mix of sun and cloud with isolated flurries.

Trace of precipitation.

Low -11 °C, High -8 °C in the alpine.

Mostly light ridge wind occasionally gusting to 55 km/h.

Freezing level at valley bottom.

Terrain and Travel Advice

  • Be mindful that deep instabilities are still present in the snowpack.
  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.

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