If they preempt programming, they're expecting ratings/viewership to go up from this coverage, so they can rack up the $$.
Money money money.... it's all TV networks care about these days
As should any business. Money is kind of an important thing in any business. I think it always has been about money. Viewing habits have changed dramatically over the past decade plus. More and more people spend less and less time watching TV, so when they do, these networks need something that will attract them. I know many of you don't like hearing this, but "reality" sells. Shows like Storm Stories and Peter Lik are probably what people want to see, and it's obviously working for TWC.
TWC is a business, and in order for a business to be successful it needs to respond to what the consumer market wants. And now the market wants reality TV. Those of us who are into weather and want a live 24 hour broadcast devoted to it are just a niche. The loss of live weather coverage isn't an accident, TWC knows exactly what it's doing. Unlike back in the 80s when they started, thanks to the internet and other info sources people now have many other ways to get their local weather. Still I think TWC should cover severe weather since that was their original mission, and that even during what live coverage remains their quality has gone downhill, and that's not about to change. A few nights ago I caught a "Live Update" where the OCM basically said "There are big storms in Missouri and Tennessee. You know what, you want more info go to weather.com. Now back to Tornado Diary." The message was clear: "Don't bother looking to us for storm info anymore, go online or elsewhere."