Boletín de aludes

Jasper

Nov 29 – 30, 2015Parks Canada
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Archivado · caducó 11 years ago

Peligro de aludes

Sun
Mon
Alta montaña
2 · Moderado
Límite del bosque
2 · Moderado
Bajo el límite
1 · Débil
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Lo esencial

Ice climbers should beware of temperature inversion conditions on steep solar exposed climbs that are producing large avalanches.  Avoid these areas until temperatures cool on Monday.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–2
    North winds have formed wind slabs on isolated terrain features at upper elevations.

  • Loose Dry

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1–3
    Temperature inversion continues with cold valley bottom temps and above freezing temps at treeline and above.  Warm temps combined with solar effect on steep gulley features are producing loose snow releases. This will be a concern to ice climbers.

Weather Forecast

Inversion conditions to continue on Sunday with freezing levels between 2100 and 3000m.  The inversion weakens on Monday.  Winds remain light, with cold temperatures overnight in valley bottoms. No precipitation until late next week.

Snowpack Summary

Previous frigid temperatures have weakened the snowpack. Whumphing noted on pockets of windslab in exposed areas around treeline. Alpine is scoured in wind exposed areas. Surface hoar formation and faceting is widespread. Warm temps in past 48hrs producing thin sun crust on solar aspects at treeline and above.

Avalanche Summary

Numerous loose dry avalanches up to size 2.5 noted on Saturday afternoon in steep solar facing gulleys between 2100 and 2700 m.  Whumphing observed in open areas at treeline on windslab.  No avalanche propagation observed but possible on steeper slopes.

Confidence

Freezing levels are uncertain on Monday

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