Morning & evening 'time'

Most English-speaking people, I'd assume (correct me if I'm wrong), know what morning and evening are. So why do so many weather forecasters, who seem to have a strange language all of their own, refer to "morning time" and "evening time"?

Weather conditions

Why is it that when the dictionary defines weather as "atmospheric conditions" nearly everyone unthinkingly refers to "weather conditions"?

It's daft!