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Avalanche Forecast

Archived

Mar 25th, 2020–Mar 27th, 2020

Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.

Regions

North Rockies.

Avalanche danger will steadily rise as a series of storms begin to impact the region.

Confidence

Low - Uncertainty is due to the limited number of field observations. Uncertainty is due to the track & intensity of the incoming weather system.

Weather Forecast

WEDNESDAY NIGHT: Strong west/northwest wind, freezing level at valley bottom, trace of snow possible.

THURSDAY: Overcast, strong west/northwest wind, freezing level rising to about 1500 m, 5 to 10 cm of snow possible during the day, another 5 to 10 cm possible Thursday night.

FRIDAY: Overcast, moderate to strong west/southwest wind, freezing level rising to about 1500 m, 1 to 5 cm of snow possible during the day, another 10 to 15 cm possible Friday night.

SATURDAY: Overcast, moderate to strong southwest wind, freezing level rising to about 1600 m, 10 to 25 cm of snow possible during the day with another 10 to 25 cm possible Saturday Night.

Avalanche Summary

No new avalanches were reported over the past couple of days.

Snowpack Summary

5-15 cm of recent new snow sits on top of a variety of old surfaces including hard wind affected snow, sun crust on slopes facing the sun and a melt freeze crust at lower elevations.

At lower elevations, two surface hoar layers 50-60 cm and 75-90 cm below the surface may still be present in the northern part of the region. Warm temperatures for an extended period last week have likely had a stabilizing effect on these buried weak layers. 

Terrain and Travel

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Watch for changing conditions today, storm slabs may become increasingly reactive.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.