Millions of people in the central United States must brace themselves for powerful storms that may include long-track tornadoes, hurricane-force winds and baseball-sized hail, forecasters said Monday,

The National Weather Service's Storm Prediction Center has issued a high risk of tornadoes across central and north-central Oklahoma this evening. Norman, Moore and Oklahoma City were among the population centers included in the Storm Prediction Center's high risk area.

A tornado destroyed homes, forced the evacuation of a nursing home and toppled trees and power lines when it roared through a small Oklahoma town, one of several twisters that erupted in the central United States amid a series of powerful storms that stretched into Tuesday.