Boletín de aludes

Purcells

Feb 10 – 11, 2014Avalanche Canada
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Archivado · caducó 13 years ago

Peligro de aludes

Wed
Thu
Alta montaña
3 · Notable
Límite del bosque
3 · Notable
Bajo el límite
2 · Moderado
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Lo esencial

Hazard may change dependent on the amount of new snow. More snow than forecast may push the hazard rating higher than forecast.

Problemas de aludes

  • Storm Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1–4
    Incoming storms will change the hazard significantly. Storm slabs on top of the recently buried weak layers will be the most important problem to be aware of. Careful terrain evaluation will be the key to safe riding/travel in the back country.

Confidence

Fair - Timing, track, or intensity of incoming weather system is uncertain on Wednesday

Weather Forecast

Synopsis:  The high pressure systems that have dominated the weathr for the past 4 weeks have been pushed out by advancing Pacific storms.  The forecast area may receive significant snowfall in the next few days.Monday Night: Freezing level at valley bottom,  Winds: Light SW , gusting to strong at ridge top.Tuesday: Freezing Level: 900m;  Precip: Trace,  Winds: Light/Mod W  gusting to Strong W/SW at ridge  top.Wednesday: Freezing Level: 1400m;  Precip: 10cm,  Winds: Moderate W , gusting to  Strong/Extreme SW at ridge top.Thursday:  Freezing Level  1000m;  Precip; Trace,    Winds:  Light W,  with occasional gusting to strong at ridge top

Avalanche Summary

Activity over the weekend was limited to isolated pockets of small wind slab at ridgetop.

Snowpack Summary

Northerly outflow winds transformed the January 29th storm (10- 20cm) into pockets of wind slab up to 40cm deep immediately lee of ridgecrest.  Surface hoar and surface facetting has occurred in sheltered locations above and below tree line leaving us with a weak surface to welcome the incoming new snowfall.Just underneath the settled storm snow and raggedy old wind slabs lies a significant weakness composed of large surface hoar (widespread in most sheltered and shaded areas at all elevations), a sun crust on south facing slopes, faceted grains (in colder areas or areas with a thinner snowpack), or a combination of the above. This variable weak layer is expected to become a problem early next week when precipitation once again graces the province. The rest of the snowpack is generally well consolidated.In isolated areas where the snowpack is thinner or in steep rocky features a facet/crust weakness near the ground remains a concern. In most places the depth of this layer combined with the strength of the overlying slab makes triggering an avalanche unlikely. However, if you were unlucky enough to find a weak spot the consequences could be deadly serious.

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