Study finds a shift eastward in this type of weather system
                                
                                
                                    (Newser) -
                                    Over the past few decades, tornadoes have been shifting—decreasing in Oklahoma, Texas, and Kansas, but spinning up more in states along the Mississippi River and farther east, a new study shows. Scientists aren't quite certain why, the  AP  notes. The study, which looked at changes since 1979, found...