Those messages are sent to stderr, and pretty much only those messages are generally seen on that output stream. You can close it or redirect it on the command-line.
$ find / -name netcdf 2>&-
$ find / -name netcdf 2>/dev/null
Also, if you are going to search the root directory (/), then it is often good to nice the process so find doesn't consume all the resources.
$ nice find / -name netcdf 2>&-
This decreases the priority of the process allowing other processes more time on the CPU. Of course if nothing else is using the CPU, it doesn't do anything. :) To be technical, the NI value (seen from
ps -l) increase the PRI value. Lower PRI values have a higher priority. Compare
ps -l with
nice ps -l.