For Matterhorn : No gale warning.
We are 80% sure of the situation, because the atmosphere might be less unstable and showers rarer than forecast.
Very cloudy with risk of thunderstorms in the morning, overcast skies with storms likely in the afternoon. Showers all day.
In the evening, overcast skies with risk of thundery outbreaks. Showers becoming less frequent. SW force 3 turning WNW in the middle of the day then W. Gusts reaching 25 knots in the evening. Good visibility becoming excellent in the middle of the day then excellent.