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Archived

Avalanche Forecast

Mar 22nd, 2017–Mar 23rd, 2017
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
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: Northwest Inland.

A persistent slab above a crust may take time to stabilize. Evaluate the terrain and snowpack carefully before committing to steeper terrain.

Confidence

Moderate - Due to the number and quality of field observations

Weather Forecast

THURSDAY: Unsettled weather with flurries bringing 5-15 cm of snow, moderate and gusty south wind, alpine temperature around -7 C.FRIDAY: Isolated flurries, moderate south wind, alpine temperature around -4 C.SATURDAY: Scattered flurries with 5-10 cm, moderate southwest wind, alpine temperature around -4 C.

Avalanche Summary

On Tuesday, a skier near Hazelton remotely triggered a size 1 avalanche that subsequently triggered two other size 2 avalanches on a persistent weak layer (30 cm deep). The avalanches occurred on northeast aspects at 1400 m. On Monday, a size 3 slab avalanche was triggered by a cornice fall on a north aspect at 1700 m north of Kispiox. Over the weekend, several reports describe reactive slabs above a crust, including a size 2.5 snowmobile-triggered avalanche in the Telkwas and a size 2 skier-triggered wind slab north of Kispiox.Steady loading and warming should keep the persistent slab reactive throughout the week.

Snowpack Summary

Unsettled weather with moderate winds is redistributing snow in exposed terrain. Mild temperatures have promoted the settlement of recent snow into a 20-60 cm thick slab above a crust interface. Recent reports suggest the bond to the crust is poor and has formed a reactive slab. Weak sugary snow near the ground has been a dormant instability, but it may still be possible to trigger in steep rocky terrain.

Avalanche Problems

Persistent Slabs

A 20-60 cm thick slab above a rain crust has been reactive to human triggers over the past week. Most activity has been in wind-affected terrain. Persistent slabs also have the potential to step down to deep basal weaknesses near the ground.
Choose well supported terrain without convexities.Avoid steep convexities or areas with a thin or variable snowpack.If triggered the persistent slabs may step down to deeper layers resulting in large avalanches.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 1 - 2