Can weather changes during a trip lead to new avalanche risks?

Understanding Avalanche Triggers

Avalanches are often triggered by new snowfall, which can be a result of weather changes during a trip. For instance, if a storm moves into the area, depositing 12 inches of new snow in a short period, it can create a unstable snowpack. This new snow can be more prone to sliding than the existing snowpack, especially if it’s deposited on top of an existing weak layer.

Identifying New Avalanche Risks

When assessing the risk of a new avalanche, consider the following factors:

• New Snow Depth: If the new snow depth is greater than 6 inches, it’s more likely to create a unstable snowpack. For every 2 inches of new snow, the weight on the existing snowpack increases by 1-2 pounds per square foot.
• Wind Slab Formation: Wind can transport light, loose snow and deposit it in drifts, creating a slab that’s prone to sliding. If wind speeds exceed 30 mph, it’s more likely to form wind slabs.
• Temperature Fluctuations: Rapid temperature changes can cause the snowpack to become unstable, especially if the temperature drops by more than 15°F in 24 hours. This can cause the snowpack to become more prone to sliding.

Mitigating New Avalanche Risks

To mitigate new avalanche risks, consider the following techniques:

• Regularly Assess the Snowpack: Monitor the snowpack for signs of instability, such as cracking or collapsing.
• Use Avalanche Safety Tools: Carry avalanche safety tools, such as a transceiver, probe, and shovel.
• Travel in Groups: Travel in groups of three or more, with one person designated as the “sitter” to monitor the snowpack.
• Avoid Riding Slopes Above 35°: Avoid riding slopes with an angle greater than 35°, as they’re more prone to sliding.