The trick is to look at lots of different sources of information. If they correlate well, then it's a fair bet that the weather is in a reasonably predictable mood and you have half a chance of knowing what is going to happen.
If the various sources are divergent then you can be sure that at least some of them are wrong.
I find it is usually best to go back to the source data (models) rather than rely on something that has been 'interpreted' by a (series of) forecaster(s) .
Try
www.westwind.ch for a huge variety of wether sources for Europe. You will need to spend at least a hour working out what is what.