Quick Answer
To assess avalanche risk, look for signs of instability, such as recent snowfall, steep terrain, and wind-blown snow, and use a clinometer to measure slope angles. A slope with an angle of 30-45 degrees is generally considered high-risk. Be cautious of slopes with a history of avalanches.
Assessing Terrain
When evaluating terrain for avalanche risk, consider the slope angle, aspect, and elevation. A slope with an angle greater than 30 degrees is considered high-risk, while a slope with an angle between 20-30 degrees is moderate-risk. Use a clinometer to measure the slope angle, and take note of any recent snowfall or wind-blown snow, which can increase the risk of an avalanche.
Reading Avalanche Terrain
Avalanche terrain can be divided into three categories: start zones, runout zones, and terrain traps. Start zones are areas where avalanches typically start, such as steep slopes and convex rolls. Runout zones are areas where avalanches typically end, such as flat areas or valleys. Terrain traps are areas where avalanches can become stuck, such as gullies or narrow chutes.
Measuring Slope Angles with a Clinometer
A clinometer is a tool used to measure the angle of a slope. To measure a slope angle with a clinometer, place the device on the ground and level it, then read the angle measurement. Use the clinometer to measure the slope angle at multiple points, taking note of any variations in slope angle. This information can help you assess the risk of an avalanche and make informed decisions about route selection and terrain navigation.
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