Eli5 How do weather forecasts differentiate whether it will remain cloudy or the clouds will lead to rain?

Question

How do we know that it will remain cloudy but won’t rain? Or if the clouds will surmount to any precipitation?

In: 121

Answer 1

Wow, who knew predicting the future involved so much trial and error?

Answer 2

Basically, weather forecasters are like your mom. They’ve seen it all before and can predict the outcome.