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Archived

Avalanche Forecast

Feb 10th, 2014–Feb 11th, 2014
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
4: High
The avalanche danger rating at treeline will be high
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Purcells.

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

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.

Avalanche Problems

Storm Slabs

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.
Avoid all avalanche terrain during periods of heavy loading from new snow, wind, or rain.>Be aware of the potential for full depth avalanches due to deeply buried weak layers.>Be aware of thin areas that may propogate to deeper instabilites.>

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 4