Most NWS information is free of copyright, and can be redistributed, but not edited.

"Information on government servers are in the public domain, unless specifically annotated otherwise, and may be used freely by the public. Some NWS information changes rapidly in response to weather and climate events, so special attention should be given to the date and time of the data and products displayed.

In addition, NWS information may NOT be edited and then presented as official government material. NWS is providing this data “as is,” and the user assumes any risk related to using this data. NWS is not liable to you or anyone else due to your use of this data.

Finally, as required by 17 U.S.C. 403, if your page consists mostly of material appearing in NWS web pages, you must provide notice that it is NWS material incorporated and not subject to copyright protection. "