I agree with IO540.
But there has been a noticeable trend over the past year or so of the forecast timings being out by a long way, and that some of the events turn out to be less severe than predicted. (have they never heard the fable about the boy who cried wolf?)
Personally, I now never cancel a booking on the basis of a morning forecast, but usually go to the field and review the situation there. I reckon last year I flew on a lot of my planned days, which the forecast said would be poor, and vice versa.
What has annoyed me more, though, is reviewing the weather the night before, from a collection of sources, and waking up to find something totally different by the 08.00hrs report.
In my view, either the weather we get now is more unpredictable than in the 70s, 80s and 90s, or the methods they use now are more prone to changes. I'd like to know which.