By John Moynier
In the event you commute, ski, snowmobile, snowshoe, or mountaineer in a space the place there's lots of slope and lots of snow, then you definately are uncovered to avalanche risk. In Avalanche conscious, veteran backcountry ski consultant and avalanche forecaster John Moynier deftly publications you thru the fundamentals of the way avalanches paintings, spotting avalanche terrain, and trying out the snow pack-before you enterprise onto volatile flooring. useful black-and-white illustrations of right apparatus, slope attitude, snow pit checks, and the results of wind and climate accompany his witty, informative reasons of the way to prevent avalanche danger. No booklet on avalanche protection will be whole with out a description of seek tools within the occasion of an unforeseen slide, and Moynier's beneficial motives of ways to head approximately discovering a misplaced buddy provide you with additional self belief if you happen to take on the slopes. For actually relaxing and profitable iciness expeditions, research Avalanche conscious earlier than you head out and make it a part of the security equipment you hold within the box.
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Extra info for Avalanche Aware: Safe Travel in Avalanche Country
Indirect-Action Avalanche Triggers Slabs also fail when a layer beneath the slab weakens. Avalanches that release due to internal weakening are called "indirect-action" avalanches. The Page 24 primary cause of this type of avalanche is the development of weak crystals or bonds between layers within the snowpack. The weakening process is essentially the rotting of the snowpack from within. " The hazard created by indirect-action triggers may actually increase with time after a storm, especially if the temperatures remain very cold or the snowpack is thin.
Before you begin digging, mark out the area you are planning to excavate. If you are planning to do a Rutschblock test (see page 84), make the pit at least a ski-length wide. Smooth the walls as Page 76 much as possible so you can easily distinguish individual layers. For the best information, make the pit walls and the face of the pit perpendicular. Digging into the slope from below will be easier and more efficient than digging a hole straight down. You will also want to make sure that your pack or loose items are off to the side to avoid burying them.
For this reason, convex roll-overs, where the slope angle increases dramatically, are particularly dangerous. The slope just above a break-over point on a convex slope is under the greatest tension. Compression stress is greatest at the bottom of convex slopes and occasionally skiers have ''tilted" a slab by overloading these areas. Slopes right below large rock outcrops or near buried bushes are likely failure points since very little tensile support exists above it. Buried bushes or small trees can also create weak points in the snowpack.
Avalanche Aware: Safe Travel in Avalanche Country by John Moynier