Sperry–Piltz Ice Accumulation Index

The Sperry–Piltz Ice Accumulation Index, or SPIA Index, is a scale for rating ice storm intensity, based on the expected footprint of an ice storm, the expected ice accumulation as a result of a storm, and the expected damage a storm inflicts on human-built structures, especially exposed overhead utility systems such as power lines. == Background == The index was introduced in 2007 by Sidney Sperry of the Oklahoma Association of Electric Cooperatives, who developed the index together with Steven Piltz, Meteorologist-In-Charge at the National Weather Service office in Tulsa, Oklahoma.

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