I think part of this is a symptom of the demise of local forecasters of considerable experience as opposed to relying on a computer. I can recall the days in the early 80s flying out of Manchester and Birmingham where one was personally briefed by a local forecaster!
By that I do not mean that I am against computers! But a local forecaster was worth his/her weight in gold who was often privy to more anecdotal data than any "computer".
Remember going into Faro many years ago at night. At top of descent we heard the other company aircraft ahead of us diverting to Lisbon due fog at Faro. I decided to continue to overhead and was able to complete a visual approach in CAVOK conditions. After we had shutdown the agent came on the flight deck and I asked him where the fog was to which he replied "Oh fog never lasts more than 30 minutes here!". This is is the sort of local knowledge which can make a difference and he wasn't even a forecaster.
When I fly GA in the Midlands we talk about "Trent Valley" effect which has a tremedous effect on the local weather which is often at variance with the local weather.