The natural phenomenon that can be observed in the Rockies during the spring is Avalanches.

During spring in the Rocky Mountains, avalanches are a significant natural phenomenon. As temperatures rise and snow begins to melt, the risk of avalanches increases, particularly in steep terrain with heavy snowpack. The combination of warming weather, rain, and the weight of new snow can destabilize slopes, leading to sudden snow slides that can be dangerous for hikers, skiers, and wildlife. Avalanche awareness is crucial for anyone exploring the Rockies in spring, as it impacts safety in outdoor activities. Understanding the conditions that lead to avalanches can help adventurers prepare and make informed decisions when venturing into the backcountry.