Avalanche Forecast

Issued: Nov 23rd, 2014 8:00AM

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

Parks Canada ali haeri, Parks Canada

The winter permit system is not yet in effect. Click here for more information.Wide range of conditions out there from shallow early season low down to more of a winter snowpack with buried weak layers higher up.

Summary

Weather Forecast

A couple of storm systems are approaching the interior. The first is expected to arrive around noon today and will bring light snow into this evening with light to moderate west winds. A second storm will bring heavier precipitation with rising freezing levels Tuesday into Wednesday.

Snowpack Summary

At tree line, 40cm of recent storm snow overlies the Nov 21 surface hoar layer. This layer formed as a sun crust on steep south aspects. The Nov 9 rain crust, 5-10cm thick, is down ~50-70cm and the Nov 3 crust is down ~70-80cm.

Avalanche Summary

7 natural size 2.0 avalanches were observed yesterday in the highway corridor east of the Rogers Pass summit out of the Mt McDonald gullies.

Confidence

Due to the number of field observations

Problems

Storm Slabs

An icon showing Storm Slabs
10cm has been added to the 30cm snow load and the moderate to strong winds we received yesterday. Expect some slabby snow as you climb higher in open areas. Remember that this new snow sits over surface hoar and on steep south a sun crust.
Be cautious as you transition into wind affected terrain.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible - Likely

Expected Size

1 - 2

Valid until: Nov 24th, 2014 8:00AM