The Sperry–Piltz Ice Accumulation Index (SPIAA) is a meteorological index created to measure the potential for ice accumulation on surfaces, particularly roads and other infrastructure, during winter weather events. It considers various meteorological factors such as temperature, precipitation, and wind conditions to provide a quantitative estimate of the likelihood and severity of ice accumulation. The SPIAA is valuable for weather forecasting and urban planning, as it helps authorities anticipate the impacts of freezing rain or similar weather phenomena.
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