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Archived

Avalanche Forecast

Feb 15th, 2019–Feb 16th, 2019
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
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Glacier.

Variable surface conditions exist throughout the bulletin region. Travel cautiously in flat light.

Weather Forecast

The arctic ridge continues to keep moisture from advancing northward. Mainly cloudy with isolated flurries today, with a freezing level of 1200m. Ridge winds are forecast to be light from the SW. Freezing levels are expected to lower over the weekend, with ~ 5 cm of snowfall.

Snowpack Summary

A dusting of new snow covers old hard wind slabs, and scoured surfaces in the ALP and exposed areas of TL. Cold temps have created a weak, faceted upper snowpack. Wind slabs have been most reactive on solar aspects, where crusts are buried. The Jan 17 SH is down 50-70cm at TL and below.

Avalanche Summary

On Saturday there was a natural cycle triggered by strong N-NE winds. Since the weekend we have only seen sporadic small wind slabs and loose dry up to size 2.0 in the alpine. There have been no reports of any new avalanches on the Jan17th PWL in over a week.

Confidence

Forecast snowfall amounts are uncertain

Avalanche Problems

Wind Slabs

Ongoing moderate winds have created widespread wind affect in the Alpine and exposed areas at Tree Line, making for challenging travel. Windslabs vary from supportive hard slabs to pockets of wind-loaded facets.
Be careful with wind loaded pockets, especially near ridge crests and roll-overs.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2

Persistent Slabs

The Jan 17 Surface Hoar layer is buried 50 to 70cm at and below tree line. This interface exists on all aspects and most reactive between 1400-1900m, especially on steep solar aspects where it overlies a crust.
Use caution on open slopes and convex rolls at treeline where buried surface hoar may be preserved.Watch for whumpfing, hollow sounds, and shooting cracks.

Aspects: All aspects.

Elevations: Treeline, Below Treeline.

Likelihood: Unlikely - Possible

Expected Size: 1 - 2