ForeFlight's icing layers have two options when connected to the internet: Icing (US) and Icing (Global), each sourced differently.
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Icing (US): This layer uses Forecast Icing Product (FIP) data, with forecasts updated hourly and extending up to 18 hours ahead.
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Icing (Global): This layer is based on the Global Forecast System (GFS) weather model, which updates every six hours, offering a broader, though coarser, view of icing potential worldwide.
For more detailed information on these layers, you can check out our blog post:
A Closer Look at Global Icing, Turbulence, and Surface Analysis Map Layers
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