Avalanche Forecast

Issued: Jan 14th, 2013 10:26AM

The alpine rating is considerable, the treeline rating is considerable, and the below treeline rating is considerable. Known problems include Persistent Slabs and Wind Slabs.

Avalanche Canada slemieux, Avalanche Canada

Summary

Confidence

Poor - Timing, track, or intensity of incoming weather is uncertain

Weather Forecast

Monday night and Tuesday: A high pressure dominates the weather bringing dry conditions. Freezing level are expected to rise up to 2500 m. and the sun to shine in the alpine while valley clouds are expected. Winds should be strong from the Northwest.Wednesday: Dry, sunny and warm conditions persist. Thursday: A cold front should lower freezing levels and bring some light snow.

Avalanche Summary

No new avalanches were reported in the region.

Snowpack Summary

The upper snowpack instabilities that were starting to settle will most likely become unstable again with the continuation of the warming trend and additional solar radiation tomorrow.  Read the forecaster's blog to learn more about this process. Last week's storm snow and yesterday's snow is sitting above weak surfaces including surface hoar (found especially below about 1600 m in sheltered areas), facets and also on a sun crust on South facing slopes. Where it exists, the buried surface hoar is producing sudden collapse results and is sitting at a prime depth for triggering with rapid warming. Recent winds and some new snow have also left wind slabs in the lee of terrain breaks such as ridges and ribs at alpine elevations and also buried old windslabs. A strong mid-pack overlies a weak facet/crust layer near the base of the snowpack. Check out yesterday's YouTube video which demonstrates some of the weak layers and test results found around Valemount BC.

Problems

Persistent Slabs

An icon showing Persistent Slabs
Be aware of rapid warming and solar radiation which will weaken the snow surface, possibly triggering an avalanche on the surface hoar layer down 80-120 cm.
Avoid paths that have not avalanched recently.>Avoid open slopes and convex rolls at and below treeline where buried surface hoar may be preserved.>

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Likely

Expected Size

1 - 5

Wind Slabs

An icon showing Wind Slabs
New wind slabs may be found behind terrain breaks such as ridges and ribs and also older buried windslabs. These could be triggered by rapid warming and sun radiation over the next few days. Be aware that they could step down to deeper instabilities.
Cornices become weak with daytime heating, avoid traveling on slopes exposed to them.>Be aware of the potential for wide propagations due to the presence of hard windslabs.>

Aspects: North, North East, East, South East, South.

Elevations: Alpine, Treeline.

Likelihood

Likely

Expected Size

1 - 5

Valid until: Jan 15th, 2013 2:00PM

Login