In a morning update, forecasters rolled back a relatively ominous outlook and said that while some tornadoes could occur, the likelihood of several twisters was low. The Storm Prediction Center warns that northern Mississippi and western Tennessee on Thursday will have a moderate risk of severe thunderstorms, one of the National Weather Service's most elevated risk levels. The storm system already led to the traffic deaths of three storm chasers in West Texas and two children who touched a downed power line while playing in Fort Worth, Texas.