Avalanche Forecast
Issued: Mar 14th, 2013 4:00PM
The alpine rating is Storm Slabs, Wind Slabs and Loose Wet.
, the treeline rating is , and the below treeline rating is Known problems includeCooler temp's will help bring the danger levels down, but it will take a few days for the new snow to stabilize at all elevations. Use conservative terrain choices.
Summary
Weather Forecast
The snow will ease off tomorrow and we should see freezing levels drop to 1200m by the end of the day. Winds will also decrease to moderate from the west. We may even see broken, patchy clouds east of the Divide. Saturday may bring another disturbance, with convective cells bringing light snow, moderate gusty winds, and a further drop in temp's.
Snowpack Summary
Up to 50cm of storm snow has fallen in the last 2 days, with higher amounts observed west of the Divide and up Hwy 93N. Storm slabs have formed on the surface and are bonded poorly to the older surfaces. Below tree-line, the rain has saturated the surface layers and created very unstable conditions.
Avalanche Summary
Lots of natural activity observed today, especially below tree-line in Yoho. Numerous deep, wet slabs to size 3 were seen failing and running to the valley floor. A party of 3 skiers in the Lake Louise backcountry remotely triggered a size 2 slab avalanche from 100m away, 50-60cm deep, 40m wide, and running 200m.
Confidence
Problems
Storm Slabs
40-60cm storm slabs are poorly bonded to older surfaces. Touchy conditions at all elevations.
- The new snow will require several days to settle and stabilize.
- Avoid all avalanche terrain during periods of heavy loading from new snow, wind, or rain.
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Wind Slabs
Strong W winds are developing wind slabs on lee aspects and will be sensitive to human triggering.
- Avoid freshly wind loaded features.
Aspects: North, North East, East.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Loose Wet
Rain to 1900m has created unstable conditions below tree-line. Travel is not recommended until the temperatures cool down.
- Difficult travel conditions.
- Ensure everyone has essential avalanche gear and knows how to use it.
Aspects: All aspects.
Elevations: Alpine.
Likelihood
Expected Size
Valid until: Mar 15th, 2013 4:00PM