Experimental Freezing Spray Guidance

Hurricane Force Warnings in Effect

Basin

Forecast hour


Modified Overland (US algorithm in cm/hr)		Stallabrass (Canadian algorithm in cm/hr)

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).