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Archived

Avalanche Forecast

Apr 21st, 2018–Apr 22nd, 2018
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
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.

Watch for surface layer instability and increasing avalanche danger as the day progresses.

Weather Forecast

West winds moderate gusting to strong will bring in another 5-10cm at higher elevations over the day. Alpine highs of -4C and freezing levels up to 1600m this afternoon. Sunny with cloudy periods and a warming trend to start the new week. Look for a change to more spring like snowpack conditions.

Snowpack Summary

Yesterday's moist afternoon snow surface is now being insulated by 10cm of storm snow at 1900m. There was likely little overnight recovery of surface crust overnight. Dry snow still exists on shaded aspects at high elevations. Cornices and wind loaded pockets lurk above treeline. The April 7th crust is now down 50-70cm and still a concern.

Avalanche Summary

New size 2 wet loose avalanche in MacDonald Gulley 3 this morning. Yesterday one new size 2 avalanche recorded in the west end of the highway corridor off of steep south facing terrain.

Confidence

Freezing levels are uncertain

Avalanche Problems

Storm Slabs

Thin fresh storm slabs should be forming this morning over the old snow surface. Watch for their reactivity early in your tour and continue to monitor through the day.
Watch for whumpfing, hollow sounds, and shooting cracks.Be careful with wind loaded pockets, especially near ridge crests and roll-overs.

Aspects: North, North East, East, South East, South.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2.5

Loose Wet

Little if any crust recovery last night. Look for daytime warming to increase the potential for loose wet slides at lower elevations today. Make the decision to be finished early.
Use extra caution on solar slopes or if the snow is moist or wet.Use extra caution on slopes if the snow is moist or wet.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2.5