Bollettino valanghe

Northwest Inland

Feb 27 – 28, 2015Avalanche Canada
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Archiviato · scaduto 12 years ago

Pericolo valanghe

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

In sintesi

Use increased caution on sun exposed slopes during the afternoon warming.Are you a member of Avalanche Canada? Join today at avalanche.ca/membership

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–2
    Strong outflow winds have caused reverse loading and thin wind slab formation. Use extra caution as you transition into wind affected terrain.

  • Deep Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely
    Dimensione
    3–5
    This is a low probability problem with large consequences. A weak basal layer resulted in several full depth avalanches during the last sunny period which could be repeated this weekend. Avoid steep, sun exposed slopes during the afternoon.

Avalanche Summary

Some loose sluffing has been reported but no new avalanches. Avalanches are generally not expected on Saturday but small loose sluffing from steep sun exposed slopes is possible during the afternoon.  Last week several full-depth avalanches up to Size 3 were observed on all but North aspects. As we get increased sun and warming heading into the weekend, these types of large isolated avalanches could once again become a problem.

Snowpack Summary

A dusting of new snow has buried the previously variable snow surface which may have included wind-pressed surfaces or old wind slabs, a sun crust or old rain crust, surface hoar, and/or surface facets. A layer of surface hoar buried in the upper snowpack has been reported in some areas and is worth investigating before committing to any big alpine terrain. At the base of the snowpack, weak facets may be persisting.

Confidence

Fair - Timing or intensity of solar radiation is uncertain

Weather Forecast

A ridge of high pressure is the dominate feature for the next three days resulting in dry and sunny conditions. On Saturday, freezing levels are expected to be 600-1000m.  Alpine winds are forecast to be moderate-to-strong from the N-NW. On Sunday, freezing levels should be around 600m. Alpine winds are forecast to remain moderate-to-strong from the N-NW. On Monday, strong-to-extreme outflow winds are forecast with the advancing of an arctic front.

Regioni coperte