How did John Know ?

John was watching television.
Just after the midnight news there was a weather forecast:
"It is raining now and will rain for the next two days.
However, in 72 hours it will be bright and sunny.."
"WRONG again", snorted John.
He was correct but how did he know?

Click here for Answer

John was watching news just after midnight, so after 72 hours it will be night time and not 'bright and sunny'