Avalanche Forecast
Issued: Apr 2nd, 2021 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs, Loose Wet and Cornices.
Mark Herbison,
Quality skiing/riding still available on higher elevation, polar aspects.
The lower elevation snowpack will deteriorate with prolonged solar radiation and warming temps.
Summary
Weather Forecast
Saturday will have a mix of sun and cloud, winds 20-60km/hr from the South West and a freezing level up to 1900m as the valley bottom reaches a high of +12. A system pushes into the region on Saturday night bringing 10-15cm of snow and gradually decreasing winds over the day on Sunday.
Snowpack Summary
Crusts exist up to ~1600m on all aspects and higher on solar aspects. Strong Southerly winds have formed wind slab at tree line and above. The March 19 interface is down 20-50cm and consists of crust on solar aspects and facets on north aspects. Basal facets exist in shallow areas east of the divide.
Avalanche Summary
Several cornice failures over the last week up to size 2.5, some of which have pulled small slabs from the slopes below.
Confidence
Problems
Wind Slabs
Strong Southerly winds have berated the mountains for the last few days and have potentially built wind slab in the alpine and exposed tree line areas. There is uncertainty on how reactive these slabs are, so use caution in loaded terrain.
- Be careful with wind loaded pockets, especially in steep confined alpine terrain.
- Use caution in lee areas. Recent wind loading have created wind slabs.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Loose Wet
Saturday will see a freezing level of ~1900m and periods of increased solar radiation which could quickly weaken the snowpack . Avoid slopes where the snow is moist or punchy.
- Avoid ice climbs that are exposed to steep rocky terrain on solar aspects.
- Use caution on solar slopes if the snow is moist or wet.
Aspects: South, South West, West.
Elevations: Below Treeline.
Likelihood
Expected Size
Cornices
Cornices are big and the springtime is when they fall off more frequently. Strong winds combined with the forecasted warmup can make them more likely to fall. Don't be nearby when they do!
- Cornices become weak with daytime heating, so travel early on exposed slopes.
- Minimize exposure to overhead hazard from cornices.
Aspects: North, North East, East, South East.
Elevations: Alpine.
Likelihood
Expected Size
Valid until: Apr 3rd, 2021 4:00PM
