For Alpnachersee-Grenzstein : No gale warning.
We are 90% sure of the situation, because the high pressure system could move in more quickly than forecast.
Sunny despite some high cloud in the morning, sunny in the afternoon. No precipitation.
In the evening, very cloudy skies becoming totally overcast. No precipitation. ENE force 1 in the morning turning SW in the evening. Gusts reaching 6 knots all day. Excellent visibility.