Further on Radar's conmments: I found the met office's forecasts to be surprisingly accurate when I was regularly flying between Shetland & Scotland for over two years at all hours of the clock. They were damn near always on the mark when I compared their forecasts to what I experienced.
A number of times I had flights, including ambulance flights, that I cancelled due to the forecast - and backed up by the METARS - because I could find no legal & safe way to complete the flight without exposing the patient to a greater risk than waiting for a day or so for a Wx improvement.