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Archived

Avalanche Forecast

Mar 14th, 2015–Mar 15th, 2015
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Banff Yoho Kootenay.

Temperatures will cool off Sunday and conditions will improve as this happens.  Watch for local wind slab formation at upper elevations. SH

Weather Forecast

15-20 cm in the alpine can be expected in most of the forecast region.(Less in the Banff area) by Sunday AM.  This is a quick moving system which will  settle down Sunday morning.  Freezing levels to valley bottom and alpine highs of -8C for Sunday. 

Snowpack Summary

Rain at lower elevations (below 2000m) has saturated thin snowpack areas. 15-20cm and mod-strong West winds are expected by Sunday morning, which will form fresh wind slabs over previous wind slabs and hard surfaces in exposed lee terrain. The basal depth hoar/facets are bridged by the settled midpack, but caution is advised in thin snowpack areas.

Avalanche Summary

No new avalanches observed or reported today.

Confidence

Forecast snowfall amounts are uncertain on Sunday

Avalanche Problems

Wind Slabs

20cm distributed by winds will make wind slabs touchy in the short term.
Caution in lee and cross-loaded terrain near ridge crests.Use caution in lee areas. Recent wind loading have created wind slabs.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2

Deep Persistent Slabs

The lower half of the snowpack is weak due to the presence of basal facets and depth hoar. This layer has been dormant lately but may waken up with the warm temperatures , rain, or in shallow areas.
Be aware of thin areas that may propogate to deeper instabilites.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3