Avalanche Forecast

Issued: Feb 4th, 2014 10:01AM

The alpine rating is moderate, the treeline rating is low, and the below treeline rating is low. Known problems include Wind Slabs.

Avalanche Canada ghelgeson, Avalanche Canada

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Summary

Confidence

Fair - Wind effect is extremely variable

Weather Forecast

Synopsis: A very strong ridge of high pressure continues to dominate the weather pattern. In the extended period the models are not breaking down the ridge as quickly, so it looks like Saturday will be dry throughout the province.Wednesday: Sky: Clear; Freezing Level: Valley Bottom; Precip: Nil Wind: Light, NE | Mod, E at ridgetop.Thursday: Sky: Clear; Freezing Level: Valley Bottom; Precip: Nil Wind: Light, N Friday: Sky: Clear; Freezing Level: Valley Bottom; Precip: Nil Wind: Light, N

Avalanche Summary

No new avalanches were observed Monday. Facets on the surface continue to sluff away in steep terrain.

Snowpack Summary

In most areas, a widespread weak layer is now buried by up to 10cm of new snow, but has yet to become a problem. This weak layer consists 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 when/if it finally starts snowing again. The rest of the upper and mid-snowpack are generally well consolidated. A facet/crust weakness near the bottom of the snowpack has gone dormant for now but may rear it's ugly head again in the future. The depth of this layer makes triggering an avalanche unlikely but the consequences would be very serious.

Problems

Wind Slabs

An icon showing Wind Slabs
Erratic winds are forming thin slabs in the alpine that rest on a variety of persistent weaknesses.  This combination will keep both the active sluffing and small wind slab problem on the front page longer than we're normally accustomed to.
Watch for terrain traps where small amounts of snow will acumulate into deep deposits.>On steep slopes, pull over periodically or cut into a new line to manage sluffing.>Carefully consider the impact a thin wind slab will have on your proposed line, especially in high consequence terrain. Have a backup line in mind in case you need to seek more sheltered riding. >Highmark or enter your line well below ridge crests to avoid wind loaded pillows.>

Aspects: All aspects.

Elevations: Alpine.

Likelihood

Possible

Expected Size

1 - 3

Valid until: Feb 5th, 2014 2:00PM

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