The software on NWS government servers are in the public domain,
unless specifically annotated otherwise, and may be used freely by the
public so long as you do not
    
    1) claim it is your own (e.g. by claiming copyright for NWS information
    2) use it in a manner that implies an endorsement or affiliation with
       NOAA/NWS
    3) modify it in content and then present it as official government material.
    
You also cannot present information of your own in a way that makes it appear to
be official government information.

As required by 17 U.S.C. 403, third parties producing copyrighted works
consisting predominantly of the material appearing in NWS Web pages must
provide notice with such work(s) identifying the NWS material incorporated
and stating that such material is not subject to copyright protection.

The user assumes the entire risk related to its use of this software. NWS is
providing this software "as is," and NWS disclaims any and all warranties,
whether express or implied, including (without limitation) any implied
warranties of merchantability or fitness for a particular purpose.
In no event will NWS be liable to you or to any third party for any direct,
indirect, incidental, consequential, special or exemplary damages or lost
profit resulting from any use or misuse of this software.