Tens of millions of people across the U.S. from the Plains to the Southeast are preparing for a potential multi-day severe weather outbreak this week, with forecasters warning of threats of large hail, damaging wind gusts and even some strong tornadoes. Strong thunderstorms rolled across Oklahoma and Texas to end the weekend on Sunday, but the FOX Forecast Center said the more significant severe weather threat will begin late Monday and last through at least Wednesday. The FOX Forecast Center said computer forecast models are highly confident that ingredients will come together to produce a widespread severe weather event. This...