For Alpnachersee-Grenzstein : 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.
Skies very cloudy, risk of thundery outbreaks during the afternoon. Risk of some spots of rain in the morning, showers late in the day.
In the evening, very cloudy with risk of storms. Light showers progressively becoming less frequent. NE force 2 turning E force 1 in the middle of the day then NNE. Gusts reaching 13 knots in the middle of the day. Excellent visibility becoming poor in the evening.