Bollettino valanghe

Waterton Lakes

Feb 2 – 5, 2016Parks Canada
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Archiviato · scaduto 11 years ago

Pericolo valanghe

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

In sintesi

Wind Slabs are hidden by a few cm of new snow, while deeper in the snowpack, a "Low probability / High consequence" problem lurks. If we see more snow or higher temperatures than forecast, hazard could rise to Considerable at Alpine & Treeline.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–2
    Buried wind slabs exist lee to previous SW winds. While stubborn, these wind slabs may propagate surprisingly far where they are hard, or sit on a hard surface. From Wednesday afternoon onwards, watch for for development of small new Wind Slabs.

  • Deep Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely
    Dimensione
    1–3
    Facets atop a deeply buried crust produced large avalanches in neighboring areas lately, and are giving Sudden results in tests. The strength of this layer is highly variable across terrain, so a conservative approach to wide-open terrain is crucial.

Weather Forecast

A few cm of snow forecast in flurries Tuesday and Thursday, while Wednesday is looking mainly clear and dry. Winds are forecast at Light from the West, with cool and steady temperatures, until Wednesday; when an increase to strong SW wind heralds a modest warming trend. Freezing Levels should reach the townsite by late Wednesday / Thursday.

Snowpack Summary

Upto 20cm of snow fell in the alpine on Thursday/Friday, being redistributed into Wind Slabs in the Alpine and Treeline. From Treeline down, rain formed a new crust, making for Variable ski conditions lower down. A December crust buried around a meter deep, although generally requiring large triggers, has potential to produce large avalanches.

Avalanche Summary

A small loose dry avalanche was observed in steep treeline terrain on Monday above Forum Lake. Several slab avalanches were observed on Friday near Forum and Cameron Lakes. These were small, with the exception of a Large (Size 3) slab avalanche, from a NE aspect on Forum Peak. This propagated surprisingly wide (300m) and ran onto Cameron Lake.

Confidence

Intensity of incoming weather systems is uncertain on Wednesday

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