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Archived

Avalanche Forecast

May 1st, 2018–May 2nd, 2018
Alpine
Below Threshold
The avalanche danger rating in the alpine will be below threshold
Treeline
Below Threshold
The avalanche danger rating at treeline will be below threshold
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold
Alpine
Below Threshold
The avalanche danger rating in the alpine will be below threshold
Treeline
Below Threshold
The avalanche danger rating at treeline will be below threshold
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold
Alpine
Below Threshold
The avalanche danger rating in the alpine will be below threshold
Treeline
Below Threshold
The avalanche danger rating at treeline will be below threshold
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold

Regions: Glacier.

All permit areas are closed today.  Tuesday is the last day of the Winter Permit System for the season.

Weather Forecast

On Tuesday expect a cloudy morning clearing in the afternoon, light west winds and a freezing level around 2200m. There is a possibility of convective flurries early in the week. The middle of the week looks like the nicest weather then deteriorates Thursday/Friday with rain showers and freezing levels over 3000m

Snowpack Summary

On all but the high North facing terrain we have a near isothermal, moist snowpack. High freezing levels, an alpine inversion and rain below 2100m contributed to minimal overnight freezes and marginal surface crust formation over the weekend. Check in to the current weather data to see if alpine temps have been below zero before heading out.

Avalanche Summary

We're in a period of prolonged elevated avalanche danger right now. Numerous avalanches to size 3.5 throughout the park were observed over the last 5 days. We've seen a handful of deep slab avalanches in the backcountry mainly on South-West aspects. These slabs initiated as point releases gathered mass and overloaded a mid pack sliding surface.

Confidence

Avalanche Problems

Loose Wet

Surface layers are somewhere between moist and saturated depending on elevation. Point releases can be expected throughout the day today and may gain mass becoming large slides.  Solar heating in the afternoon should increase the avalanche activity.
Avoid exposure to avalanche terrain, large avalanches may reach the end of run out zones.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Very Likely

Expected Size: 1 - 3.5

Wet Slabs

Point releases have been gaining mass and in some cases triggering wet slab avalanches as they progress down slope. These slides are destructive and running far.
Avoid exposure to avalanche terrain, large avalanches may reach the end of run out zones.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 3

Cornices

Cornices are ripe and weakened by past warm weather. Avoid exposure to terrain below these large triggers.
Avoid exposure to avalanche terrain, large avalanches may reach the end of run out zones.

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

Elevations: Alpine.

Likelihood: Possible - Likely

Expected Size: 1 - 3