Bollettino valanghe

Little Yoho

Mar 10 – 11, 2022
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Archiviato · scaduto 5 years ago

Pericolo valanghe

Fri
Sat
Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
1 · Debole

In sintesi

Go for shady aspects right now, the snow is cold and dry here. The sunny side of the mountain holds buried crusts that are proving unpredictable in their location, the overlying slab and the likelihood of triggering. Uncertainty demands wide margins.

Problemi valanghivi

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely
    Dimensione
    1.5–3

    The crust/facet layer down 20-40cm on solar slopes at treeline and above has produced a size 3.5 skier accidental avalanche on Mar 8. Give it a wide berth. The buried crust will be more prominent on solar aspects, and does not exist on north aspects.

Confidence

Weather Forecast

The next few days will warm slowly as the weather pattern changes. The NW flow continues, but a low pressure system will cross the area starting Thursday bringing trace amounts of snow, light to moderate winds and temperatures a few degrees warmer each day. No significant inputs to change the avalanche hazard are expected for the next few days.

Snowpack Summary

5-10 cm of low density snow sits over a sun crust on steep solar aspects that exists up to about 2600 m. North winds overnight Wed may develop wind effect and small windslabs in the alpine. February 16 sun crust down 30-40 cm on west, south and east aspects. January 30 facet or sun crust interface is down 50-80 cm. Lower snowpack is well settled.

Avalanche Summary

On Tues a skier triggered a large persistent slab (size 3.5) on the southeast slope of Vermillion Peak. No involvement was reported but this is a wake-up to the potential on this crust. Also on Tues we received a report of a cornice triggered size 2.5 slab avalanche on Mt. Carnarvon in Yoho - this one also likely ran on the crust. Note the pattern.

Regioni coperte