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Archived

Avalanche Forecast

Jan 16th, 2019–Jan 17th, 2019
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
1: Low
The avalanche danger rating below treeline will be low
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
1: Low
The avalanche danger rating below treeline will be low
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Jasper.

Recent warm days and cool nights have strengthened the mid and upper snowpack, but changes to the deep persistent weakness will be much slower. A conservative approach is still warranted.

Weather Forecast

An arctic front approaching from the NE brings the potential for upslope flurries Thursday.  Followed by bands of precip embedded in a low this weekend, giving strong winds and rising temps.Thurs: Sun and cloud mix, light flurries. Alpine Low -15 C, High -8 C, light ridge wind.A detailed mountain weather forecast is available from Avalanche Canada.

Snowpack Summary

Surface conditions vary thanks to the past weeks drought - a thin crust on steep solar aspects, 5-10mm surface hoar in sheltered areas, and wind effect in exposed areas from moderate-strong SW winds. A generally strong mid snowpack overlies deep persistent weaknesses. Use caution in shallow areas where these deep weakness might be more reactive.

Confidence

Avalanche Problems

Deep Persistent Slabs

Use caution in shallow snowpack areas where deep weakness might be more reactive to a human load. Build trust slowly in the snowpack before committing to any large rideable slope.
Avoid steep convexities or areas with a thin or variable snowpack.Avoid thin, rocky or sparsely-treed slopes.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 1.5 - 4

Wind Slabs

Recently formed wind slabs appear to bonding well to the snowpack below.
Be careful with wind loaded pockets, especially near ridge crests and roll-overs.If triggered the wind slabs may step down to deeper layers resulting in large avalanches.

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

Elevations: Alpine.

Likelihood: Unlikely - Possible

Expected Size: 1 - 2