weather.gov is best for the "forecast discussion" page, which often gives backstory on which parts of the forecast are certain and which are speculative.
windy.com gives multiple forecasts from different agencies, which also helps calibrate confidence. They also have some great visuals, and a very good interface.
I'm in the US, and use both http://weather.gov and http://windy.com. I think they complement each other.
weather.gov is best for the "forecast discussion" page, which often gives backstory on which parts of the forecast are certain and which are speculative.
windy.com gives multiple forecasts from different agencies, which also helps calibrate confidence. They also have some great visuals, and a very good interface.