For Alpnachersee-Grenzstein : No gale warning.
We are 75% sure of the situation, because the high pressure system could move in more quickly than forecast.
Skies very cloudy, risk of some thundery outbreaks. Risk of some spots of rain in the morning, light showers in the afternoon.
In the evening, skies clearing but continuing risk of storms. Light showers progressively becoming less frequent. NNE force 1 becoming NE force 2 in the middle of the day then SW force 1. Gusts reaching 13 knots in the middle of the day. Excellent visibility.