THE FORECAST ICING POTENTIAL ALGORITHM

The Forecast Icing Potential (FIP) algorithm was developed at the National Center for Atmospheric Research under the Federal Aviation Administration's Aviation Weather Research Program. The FIP examines output from a numerical weather prediction model to calculate the potential for in-flight aircraft icing conditions. This icing potential demonstrates the confidence that a three-dimensional atmospheric location, represented by a model grid box, will contain icing conditions. The algorithm uses a combination of weather scenarios and fuzzy logic membership functions to compute the icing potential.