Avalanche Forecast
Issued: Nov 14th, 2020 8:00AM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Storm Slabs and Wind Slabs.
Kate Ryan,
25 cm in the last 24 hrs and strong Southerly winds will be creating reactive slabs.
Avalanches have the potential to run from higher elevations to below treeline. Keep a heads up!
Summary
Weather Forecast
A transient ridge of high pressure today before a frontal system arrives tomorrow
Today: mix of sun and cloud with isolated flurries. Alpine high -10*C. Winds west-20 gusting to 45km/h
Tonight: mainly cloudy with isolated flurries. Low -11*C. Winds south-30km/h
Tomorrow: snow accumulating to 13cm. Freezing level 1200m. Winds SW-45 gusting to 75km/h
Snowpack Summary
Today's storm snow makes a total of 30-50cm over the Nov 5th crust. At treeline the meter plus snowpack consists of a series of crusts with weaker snow surrounding the crusts. The strong Nov 5th crust reaches as high as 2500m, and potentially higher on steep solar aspects.
Avalanche Summary
Moderate to strong S'ly winds are initiating a natural avalanche cycle from alpine features this morning. Yesterday, several small loose dry avalanches were observed off of the north side of Mt. Macdonald.
Confidence
Problems
Storm Slabs
Watch for soft storm slabs forming over the Nov 5 crust at and above treeline where wind effect may amplify their sensitivity to human triggering.
- Be careful with wind loaded pockets, especially near ridge crests and roll-overs.
- 1011
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Wind Slabs
Last weekend's outflow wind formed small pockets of windslab on immediate lees. These sit on a firm crust to 2500m and higher on steep solar aspects.
- Keep an eye out for reverse loading created by northerly winds last weekend.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Nov 15th, 2020 8:00AM
