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Avalanche Forecast

Archived

Apr 21st, 2018–Apr 22nd, 2018

Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Below Threshold.
Treeline
Below Threshold.
Below Treeline
Below Threshold.

Regions

Olympics.

While generally safe avalanche conditions are expected Sunday, you can still trigger a small loose wet avalanche on steep sunny slopes or at lower elevations as the day warms. Look for signs of wet surface snow developing as you travel. Avoid slopes with terrain traps where even a small loose wet avalanche could have unintended consequences. 

Detailed Forecast

Sunday should be a fair spring weather day with some building cumulus in the afternoon. Freezing levels should push to near 6000 feet after a cool start. 

While generally safe avalanche conditions are expected Sunday, you can still trigger a small loose wet avalanche on steep sunny slopes or at lower elevations as the day warms. Look for signs of wet surface snow developing as you travel.  New rollerballs, fresh fan shaped avalanche debris, and wet surface snow deeper than your ankle all indicate the potential for loose wet avalanches has developed on similar steep slopes. Avoid slopes with terrain traps where even a small loose wet avalanche could have unintended consequences. 

Snowpack Discussion

An inch or two of new snow with moderate south winds Friday night transitioned to partly to mostly cloudy skies with cool temperatures in the Hurricane Ridge area Saturday. No new avalanches were reported. 

NWAC pro-observer Matt Schonwald visited the Hurricane Ridge area Friday. Initial warmth and sunshine Friday gave way to overcast high clouds as the day progressed. Melt-freeze crusts softened by late morning in the Hurricane Ridge area making for pleasant travel conditions. New snowfall received early last week has pushed the total snow depth in the near and above treeline bands to a seasonal maximum. Cornices were generally small in the Hurricane Ridge area. Only small loose wet avalanches were observed on steep sunny slopes Friday.  While several layers can be found within the snowpack, there are no significant layers of concern at this time.

Problems

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.