Bollettino valanghe

South Rockies

Feb 7, 2019Avalanche Canada
Vedi sulla mappa
Archiviato · scaduto 8 years ago

Pericolo valanghe

Fri
Sat
Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
2 · Moderato
Apri la mappa completa

In sintesi

Visible patterns of wind loading will help you to navigate around unstable pockets of wind slab. A less obvious persistent slab problem should have you raising your guard at mid elevations.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–2
    Recent snow may have been redeposited with southwest winds that switched to northeast winds. The touchiest pockets will likely be adjacent to ridges.

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1.5–2.5
    A weak layer of surface hoar is now buried 35-45 cm deep. This layer has been regularly producing large avalanches in adjacent regions where it is only slightly deeper. It is best preserved in shaded, sheltered areas between 1600-1900 m.

  • Deep Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely - Possible
    Dimensione
    2–3.5
    The bottom of the snowpack consists of weak and sugary faceted snow. The likelihood of triggering this layer may be relatively low, but the consequences remain high. Any deep persistent slab avalanche will be large and destructive.

Confidence

Moderate -

Weather Forecast

Wednesday night: Clear with cloudy periods. Light west winds.Thursday: A mix of sun and cloud with isolated flurries and a trace of new snow, continuing overnight. Light to moderate southwest winds, increasing to strong northwest in the aline. Alpine high temperatures around -16.Friday: Cloudy with scattered flurries bringing up to 5 cm of low density new snow, continuing overnight. Light northeast winds. Alpine high temperatures around -21 and cooling over the day.Saturday: Mainly cloudy with easing flurries finishing with around 2 cm of new snow, bringing new snow totals to about 10 cm. Light northeast winds, with strong southeast winds in the alpine easing over the day. Alpine high temperatures around -24.

Avalanche Summary

No new avalanches were reported on Sunday. One observation of an older natural size 2 wind slab release was reported from the Castle area on Tuesday.Many small to large avalanches were triggered within the recent storm snow by skiers, naturally, and with explosives on Saturday. The fact that we have numerous weak layers within our snowpack indicates that conservative decisions should be made at this time.

Snowpack Summary

Above 1700 m, 25 to 35 cm of recent snow overlies a variety of surfaces, including feathery surface hoar crystals in shaded and sheltered areas, wind-affected snow in exposed terrain, and a melt-freeze crust on southerly aspects. Below 1700 m, expect to find around 5-10 cm of low-density snow on a melt-freeze crust.The mid-January layer of surface hoar or a crust is buried around 35 to 45 cm deep. The surface hoar is found on shaded and sheltered slopes and is most prominent between 1600 m and 1900 m but has been found up to 2100 m. The melt-freeze crust is found on south aspects at all elevations.The middle of the snowpack is generally consolidated. The bottom half of the snowpack is unconsolidated and composed of weak and sugary faceted grains.

Regioni coperte