About NDFD Graphics
The National Weather Service's NDFD graphic products are derived from a prescribed set of data contained within the NDFD (https://www.weather.gov/mdl/ndfd_home). These graphics are representations of the official NWS digital forecast. Forecast information for the Canadian portion of the Great Lakes is for informational purposes only and does not constitute an official forecast. Forecast information for Alaska is experimental. Forecasts for the offshore waters and high seas areas of the Pacific Ocean and the high seas areas of the Atlantic are also experimental.
Detailed information about NDFD data can be found at https://www.weather.gov/mdl/ndfd_home.