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Archived

Avalanche Forecast

Mar 23rd, 2021–Mar 24th, 2021
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
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
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Glacier.

Moderate winds will encourage slab development and increase the hazard this afternoon.

Weather Forecast

A ridge of high pressure will break down later today as a fontal system pushes in from the NW.  A mix of sun and cloud today with an alpine temperature of -7, moderate SW winds and freezing level at 1400m.  The incoming frontal system will deliver 5-10cm of new snow Wednesday with an alpine temperature of -5 and freezing levels around 1400m.

Snowpack Summary

30-45cm of recent storm snow is covering a melt-freeze crust on solar aspects and isolated pockets of surface hoar on polar aspects. Recent high freezing levels have created a moist upper snowpack at lower elevation which is now topped with a breakable crust. Cornices are large and fragile.

Avalanche Summary

A group triggered a skier accidental size 1.5 on the top of Puff Daddy , where the storm slab has gained more cohesion.  Three size 2-2.5 natural avalanches were observed on steep N facing terrain in the highway corridor in the gullies on Mt MacDonald.

Confidence

Timing, track, or intensity of incoming weather system is uncertain

Avalanche Problems

Wind Slabs

Moderate winds have coaxed 30-45cm of recent storm snow into a cohesive and reactive slab in exposed areas. This slab sits atop a crust on steep solar aspects and surface hoar on shaded aspects. This layer is reactive to skier triggers.

  • Be careful with wind loaded pockets, especially near ridge crests and roll-overs.
  • Carefully evaluate terrain features by digging and testing on adjacent, safe slopes.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 2.5

Loose Dry

Today's weather forecast calls for sunny periods. Although the day is starting off cold, intense spring sun combined with recently deposited snow will lead to loose avalanches on steep solar terrain this afternoon.

  • Minimize exposure to sun exposed slopes when the solar radiation is strong.
  • Recent snow may be more sensitive to human triggering on solar aspects where it sits on sun crust

Aspects: South East, South, South West, West.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 1 - 2