Avalanche Forecast

Issued: Mar 14th, 2013 10:38AM

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

Avalanche Canada slemieux, Avalanche Canada

Precipitation amounts vary a lot throughout the region. Be aware of conditions that are specific to your area and make observations continuously as you travel.

Summary

Confidence

Fair - Forecast snowfall amounts are uncertain on Friday

Weather Forecast

Thursday night and Friday: Enhanced precipitation are expected over the region with the low pressure tracking over the region tonight. Freezing levels will start to drop (1700 m.) bringing the snow line lower. Light to moderate amounts are expected until Friday and will taper off becoming light during the day. Moderate to strong winds should switch from the SW to the W.Saturday: Unsettled conditions without any frontal systems bringing very light precipitation,moderate to strong W winds, mainly cloudy skies and freezing levels near 1500 m.Sunday: Similar pattern as Saturday with cooler temperatures and lighter winds.

Avalanche Summary

A natural avalanche cycle happened yesterday at all elevation and on all aspect up to size 3 in the Lizard Range region. Suspect similar cycle in the South Rockies region where precipitation amounts were similar.

Snowpack Summary

The warm storm has left a significant amount of wet precipitation or heavy snow (10-30 cm of heavy snow above 1800m. and rain under).  At higher elevations, snow has been transported by strong SW and W winds creating windslabs that are probably very touchy. Below the freezing line, the snowpack is rain soaked. Another pulse of precipitation is forecasted, adding weight onto the storm slab and the already moist/wet snowpack.  The new snow has not been bonding well to the underlying surfaces creating natural avalanche activity and showing signs of instability like cracking around skis.  Some of the significant underlying surfaces mentioned before include a suncrust on S aspects and a melt-freeze crust on all aspects below 1700 m.

Problems

Storm Slabs

An icon showing Storm Slabs
Warm and wet storm has created and is going to keep developing storm slabs, new wind slabs lee of strong SW-W winds in the alpine, wet slab and loose avalanches at lower elevations.
Be alert to conditions that change with elevation.>Minimize exposure to overhead avalanche terrain, as large avalanches may reach the end of runout zones.>

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Very Likely

Expected Size

1 - 6

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

Login