Boletín de aludes

South Rockies

Feb 15 – 16, 2015Avalanche Canada
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Archivado · caducó 12 years ago

Peligro de aludes

Tue
Wed
Alta montaña
2 · Moderado
Límite del bosque
2 · Moderado
Bajo el límite
1 · Débil
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Lo esencial

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Problemas de aludes

  • Cornices

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    1–3
    Cornices may not be well anchored after the week of warm weather. Strong solar radiation may result in natural cornice falls.

  • Deep Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    3–5
    The re-freeze has begun, and the likelihood of triggering a deeply buried weak layer should reduce as the freezing continues. Daytime heating, strong solar radiation, or cornice falls could trigger deep weak layers.

Confidence

Fair - Timing or intensity of solar radiation is uncertain

Weather Forecast

The freezing level should drop down to the valley bottoms overnight and then rise up to about 1500 metres during the day on Monday. This pattern is expected to continue for Tuesday and Wednesday. The only uncertainty is how much sun we will see over the next few days. There is a chance of valley cloud and high cloud each day.

Avalanche Summary

No new avalanches reported.

Snowpack Summary

I suspect that there was a good re-freeze down to valley bottoms that produced a new surface crust. In the Elk valley north there is 100-160 cm of snow at treeline. The late January crust and surface hoar is down about 30-50 cm and shows moderate results in snow profile tests; this layer was displaying very little propagation in tests. The mid-December buried crust layer is down about 50 cm at 2150 metres elevation and continues to react to hard forces in tests with stubborn results. The snowpack was moist down to the ground on Saturday, and is expected to re-freeze with forecast overnight temperatures. There is not much snow below 1600 metres, and a lot of bare areas below 1200 metres.

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