When I was operating commercially out of Leeds/Bradford (nice airfield for fog), it was not unusual to come in of a morning to find the forecast CAVOK, but the actual foggy. The forecast was produced by a computer in Frankfurt, which had all the facts, but no local knowledge. Depart for wherever, and then wait for the weather to become suitable to return home. The best destination was Belfast (Aldergrove) where one could actually speak to a real, live forecaster. Then, with a good idea of when the weather would improve, blast off and be first back.