He wasn't wrong though, it wasn't a Hurricane, it had hurricane force winds but there was no eye wall, no hurricane structure, by all meteorological standards it wasn't a hurricane but a very severe and deep low pressure system. Also, directly after he says that there isn't a hurricane coming he states that it is going to get very windy, but then puts those strong winds further south than they actually materialised, which was probably down to the way the models were working at the time.
Of course, the media picked up on him saying no Hurricane and then hurricane-force winds ripping apart south-east England, and Michael Fish would only ever be remembered for one thing...