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Experimental Freezing Spray Guidance
The Overland* and Stallabrass images above depict the forecast ice accumulation rate (in cm/hour) at 12 hours, 24 hours, and 36 hours. The rate is an instantaneous forecast, not cumulative.
The guidance is based on the Global Forecast System (GFS) model data.
*More information on the Fetch Factor applied to Overland freezing spray algorithm (pdf).