text: When predicting the weather, there are so many variables that's it's very difficult to try to predict what each one will be...   also being that they are 'variables', they can change without notice, and that changes what the weather will be, but the weatherman didn't know that change was going to happen...\n\nThey can just do their best, and hope it comes out right...\n\nOn a side note, most weathermen now don't predict the weather themselves, they use computer modeling software...\n\nThis software (in some cases) is linked directly to weather stations to get real time what is happening where, as well as feeds from satelites and other things and also uses what's happened in the past for that area to help predict the weather then the weatherman isn't a metorologist anymore, he/she's just there as a personallity either on the radio, or tv...