For Grienenbergsee : No gale warning.
We are 80% sure of the situation, because in this type of situation, it is difficult to define precisely when the precipitation will begin.
Overcast skies. No precipitation.
In the evening, very cloudy skies becoming totally overcast. Light rain in the early hours. SW wind force 4 from the middle of the day. Gusts reaching 30 knots in the evening. Excellent visibility.