For Grienenbergsee : No gale warning.
We are 85% sure of the situation, because in this type of situation, it is difficult to define precisely when the precipitation will end.
Very cloudy skies to overcast. Risk of black ice.
In the evening, good clear periods but cloud building. Warning: icy conditions likely. W force 3 turning NW force 4 in the middle of the day then NNW. Gusts reaching 21 knots in the middle of the day. Visibility reduced by mist becoming good in the middle of the day then good.