Nearly 10 million people in central US under threat of severe weather, agency warns

National Weather Service's Storm Prediction Center issued a rare high risk for central Oklahoma and southern Kansas

Millions of people in the central US could see powerful storms on Monday including long-track tornadoes, hurricane-force winds and baseball-sized hail, forecasters said.

Much of Oklahoma and parts of Kansas are at the greatest risk of bad weather - including areas in Oklahoma, such as Sulphur and Holdenville, still recovering from a tornado that killed four people and left thousands without power last week.