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Archived

Avalanche Forecast

Apr 15th, 2016–Apr 16th, 2016
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: Northwest Coastal.

It will continue to look and feel a lot like winter Saturday. Approach the mountains as if the calendar says January, not April.

Weather Forecast

A ridge building to the south is expected to steer the jet stream into the northwest coast through the weekend. Freezing levels should remain relatively low through Sunday and a fair amount of precipitation is expected through the weekend. SATURDAY: Overcast skies, freezing level at 1500 m, 5 to 15 cm of snow, strong south wind. SUNDAY: Overcast skies, freezing level beginning around 1500 m, climbing to 2000 m throughout the day, 5 to 10 cm of snow, strong south wind. MONDAY: Overcast skies, freezing level holding around 2500 m, scattered rain/snow showers/flurries, strong to extreme south wind.

Avalanche Summary

No new observations to report from Thursday. On Wednesday loose wet avalanches were reportedly running naturally to size 1 on north through west facing terrain between 1300 and 1600 m. On Tuesday loose wet/"moist" avalanches to size 2 were observed from steep rocky terrain.

Snowpack Summary

5 to 25 cm of new storm snow has fallen at higher elevations in the last 72 hours. The wind has primarily been out of the south during the storm, which has likely formed fresh wind slabs and created new cornice growth. The storm snow has buried a widespread melt-freeze crust which was thought to exist almost everywhere, the exception may be high elevation north facing terrain. A widespread crust/facet layer from early February and depth hoar at the bottom of the snowpack (primarily in northern & inland areas) has gone dormant for the time being. These layers have the potential to wake up during periods of prolonged warming.

Avalanche Problems

Storm Slabs

New storm snow combined with strong southwest wind is expected to continue to generate fresh storm slabs Saturday. These storm slabs rest on a crust in many locations which will likely make them quite sensitive to human triggering.
The new snow will require a day or two to settle out.>Be alert to conditions that change with elevation.>Avoid all avalanche terrain during periods of heavy loading from new snow, wind, or rain.>

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 4

Cornices

New snow and strong southwest wind will add mass to the existing trophy sized cornices that adorn many ridge lines.  This may lead to natural cornice failure during the storm.
Continue to watch and limit your exposure to overhead cornices and give these monsters an extra wide berth when traveling on or below ridges. >

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

Elevations: Alpine.

Likelihood: Possible

Expected Size: 2 - 5