I agree with Weeters, it's also not just as simple as "we're breaking into programming," if WEWS is hubbed as far as master control, you would have to contact them and let them know you're breaking into programming. On top of that, the network will need to be informed you are breaking into their programming to deliver breaking news and find out if there will be a special re-air or if you're just plain SOL. In the case of soap opera viewers, you DO NOT mess with their soaps unless there is actual cause for concern. A simple crawl and heavy social media presence is good enough in this day and age. If they waited and broke into WWTBAM, they can do so because that is their syndicated slot and syndications can be reaired later. However, why would we risk potential local ad revenue for breaking news about something that ended up being nothing.
Furthermore, like Weeters said, it's better to know all the facts and have things confirmed than to break into programming and have no idea what you're talking about.
Working on an assignment desk, I get hate calls all the time for breaking into programming and against. You can't make everyone happy. And screaming at the person who answers the phone and telling them that they and the station can go to hell and you'll never watch them again means absolutely nothing. For every lost viewer for something stupid and small, we gain about 100 more.