by tuesday, but the next two days, certainly the worst we have had so far this year and will likely see a number of tornadoes. some of them could be the large, long-lasting tornadoes that are generally destructive. >> thank you, rick. in other stories making headlines this sunday morning, we'll get to a fox news alert. overnight south korea's prime minister stepping down over that deadly ferry accident. he apologized to the victims' families amid claims that the government just didn't do enough to rescue their loved ones. 15 crew members involved in navigating the ferry have been arrested. meanwhile, the search of the wreckage continues today. 187 people are confirmed dead. 115 are still missing. at least nine people in texas were injured in an explosion at a plywood plant. it happened in the small town of corrigan at the plant. the cause of the explosion is