Notice: welcome to x network
If ^^that^^ is the "real" notice it's another script, not mIRCs default notice display. (-Nick- message here)
Code:
on ^*:notice:*:?:{
  if !$window(@Notices) { window -n @Notices }
  echo -mlirtc notice @Notices $+(-,$nick,-) $1-
  haltdef
}