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What is a loose snow avalanche (vs. slab avalanche)?
Start in a small area and grow as they gather loose snow. Formless mass with little cohesion.
What is a slab avalanche (vs loose snow avalanche)?
Large area of snow begins to slide at once. Defined fracture line. The cause of practically all avalanches.
What are ideal angle and slope conditions for an avalanche?
30 to 45 degrees and convex.
At what slope angles can avalanches occur?
25 to 60 degrees
When is snow on north facing slopes most likely to slide?
When is snow on south facing slopes most likely to slide?
Spring and sunny days
What is the wind speed threshold for avalanche danger to increase?
What are some risk factors for avalanche?
Old slide paths, hollow sound, cracks, recent avalanche activity, old snow covering anchors, wind in excess of 15 mph.
After one hour, what is a victim's chance of survival?
Mountain Rescue Alpine MR CAMRA
Alpine MR CAMRA