We had a great weather-guesser at Gütersloh in the late 70s, who was very much trusted by us pilots. One Friday afternoon, he rang the squadron and advised that we all go to the bar. 30 minutes later we were hit with rain ice that turned the airfield into a skating rink, broke the tops off all the birch trees and locked people out of their cars by covering them in sheet ice.
Eh! Those were the days!
Mog