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        Tracks of tornadoes generated during the 1974 Super Outbreak.
        From the  National Weather Service, Courtesy of  Ted Fujita ( actual image link)
        
         
        
        
         
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          This image is in the  public domain because it was stored on the web servers of the U.S.  National Weather Service. NWS-created images are automatically public domain since the NWS is a part of the US government. However, the NWS sites also host non-NWS images which have been submitted by individuals: these are generally shown as "Courtesy of ...". Such images have explicitly been released to the public domain by the copyright owner as part of the upload process: see for example  here,  here,  here and  here. As stated at  http://www.weather.gov/disclaimer.php:"The information on government servers are in the public domain, unless specifically annotated otherwise, and may be used freely by the public....". 
           Thus, all images on NWS servers are public domain (including "Courtesy of .." images) unless specifically stated otherwise.
            
           
            
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