Experimental Freezing Spray Guidance


Alaska and Pacific  Atlantic  

Forecast hour

12  24  36  

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

NOTE: The experimental freezing spray guidance shown here should be used with other data when making decisions impacted by weather forecasts.
For official weather forecast information, please consult the following resources when using this guidance:

NWS Alaska Region

NWS Atlantic Marine Forecast Areas

NWS Pacific Marine Forecast Areas

Canada Marine Forecasts and Warnings

Other information about this product:

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).