Weather is like medicine, they practice it. TV people are hired for there ability to read, not be experts in metrology. The weather Channel being a possible exception. Believe it or not there are some great sources of weather out there. If you can read millibar or pressure charts you can do it on your own. I always laugh when I see someone ( my wife ) pull out a radar app and attempt to determine what's going to happen. As someone who's crossed a few oceans and the continent a more than a few times we have to have a somewhat reliable source of weather or it would be a mess. That being said, things change. Weather is very dynamic.