Avalanche Forecast
Issued: Nov 30th, 2020 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs and Persistent Slabs.
Timothy Johnson,
A weak temperature inversion is forecasted for Tuesday so watch for solar triggered avalanches around rocky terrain.
Summary
Weather Forecast
Parker Ridge Area
Tuesday: Sunny, alpine temperature: High 1 °C. Ridge wind northwest: 10 km/h. Freezing level: 1400 metres. Weak temperature inversion.
Wednesday: Sunny with cloudy periods. Precipitation: Nil. Alpine temperature: Low 2 °C, High 6 °C. Light ridge wind. Freezing level: 3500 metres.
Snowpack Summary
Extreme winds have stripped the snow from windward slopes in the alpine. Soft snow can still be found in specific sheltered locations at tree line and below. Snow depth at the Bald Hills at tree line is around 80cm with the Nov 4 crust down 50cm and breaking down. The snowpack is supportive to skis. There may be a thin temperature crust below 1700m
Avalanche Summary
Reports of isolated large avalanches failing near the ground have been reported in the region over the last 72hrs. On Saturday explosive control at Parkers slabs resulted in two size 2.5 avalanches from the wind loaded storm snow. A few other thin slabs were noted in steep alpine terrain.
Confidence
Problems
Wind Slabs
Continuing strong SW winds in the alpine is scouring windward slopes. Be cautious of local wind influences where reverse or cross loading may have occurred.
- Watch for Wind Slabs low on slopes, and in usually sheltered terrain, due to previous extreme winds.
- If triggered the wind slabs may step down to deeper layers resulting in larger avalanches.
Aspects: North, North East, East, South East, North West.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Persistent Slabs
The Nov. 4 is down about 50cm at tree line (2000m) and breaking down. Be careful around "thin to thick" areas where deep slabs could be triggered.
- If triggered the storm slabs may step down to deeper layers resulting in large avalanches.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Dec 1st, 2020 4:00PM
