Avalanche Forecast
Issued: Dec 11th, 2019 4:38PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs and Deep Persistent Slabs.
william lawson,
Parks Canada
Great conditions can be found in the northern part of the forecast region. Keep an eye out for changing conditions, especially increase winds as there's a significant amount of snow available for transport.
Summary
Weather Forecast
Flurries will continue till the end of the week amounting to10cm of snow by Friday. I slight increase in wind values at alpine elevations is expected Thursday but will quickly dissipate by early Friday. Generale steady temperatures around -7 are forecasted till Friday.
Snowpack Summary
Snow amount vary through the forecast region. Areas north of the HWY1 (little Yoho) received 50-70cm last week creating a well developed early winter snowpack. These typical deeper snowpack areas have few faceted layers and are begging to form a settled mid pack. Around Field the snowpack is much shallower resembling the Banff forecast region.
Avalanche Summary
A few natural avalanches were observed in Little Yoho Wednesday that appeared to have released in the last 24 hours. One notable size 3 failed immediately below ridge crest on a steep alpine feature that appeared to be a wind slab releasing on the recent storm interface.
Confidence
Problems
Wind Slabs
Recent snow and wind have formed reactive wind in many open areas at alpine elevations. Human triggering of this slab remains possible or even likely in some terrain, though natural avalanche activity has slowed down.
- Use caution in lee areas. Recent wind loading has created slabs over weaker snow.
Aspects: North, North East, East, South East, South.
Elevations: Alpine.
Likelihood
Expected Size
Deep Persistent Slabs
The recent snow sits over weak facet and crust layers in some areas of the forecast region. Human triggering in steep terrain remains a concern.
- Be aware of thin areas that may propogate to deeper instabilites.
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Valid until: Dec 12th, 2019 4:00PM
