Avalanche Forecast

Issued: Feb 8th, 2014 8:56AM

The alpine rating is low, 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 - Timing, track, or intensity of incoming weather system is uncertain on Monday

Weather Forecast

Synopsis: The shockingly robust and long lived ridge of high pressure persists through the weekend. It finally breaks down on Sunday opening the door to a string of frontal systems that are queuing up in the Eastern Pacific.Sunday: Sky: Sunny; Freezing Level: Valley Bottom; Precip: Nil Wind: Light, VariableMonday: Sky: Overcast; Freezing Level: 600m; Precip: 5/10 cm Wind: Light, SW | Strong W/SW at ridgetop. Monday night: Strong SW winds at all elevations. Extreme at ridge top.Tuesday: Sky: Overcast; Freezing Level: 800m; Precip: 10/15cm Wind: Light, SW | Strong SW at ridgetop.

Avalanche Summary

Avalanche activity over the last three days has been limited to surface sluffing resulting in loose snow avalanches to size 1 in steep terrain at all elevations.

Snowpack Summary

A small front came through the region on January 29th leaving around 10 cm of snow in it's wake. Outflow winds (out of the N/NW) have formed small wind slabs in wind exposed terrain at and above treeline. Well settled faceted snow can be found on the surface in wind protected features. Just below the surface a weak layer exists that 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 significant problem early next week when 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
Cold temps and time have gone to work on the wind slabs and they've become a lot less sensitive.  Keep your guard up at ridge crest where you're most likely to find the odd rider triggerable wind slab. Watch for aggressive sluffing in steep terrain.
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. >Be cautious of sluffing in steep terrain.>Highmark or enter your line well below ridge crests to avoid wind loaded pillows.>

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Unlikely - Possible

Expected Size

1 - 2

Valid until: Feb 9th, 2014 2:00PM

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