A series of powerful tornadoes tore through six American states over the weekend, killing at least 90 people.Tornadoes are destructive storms in which powerful winds move around a central point.One of the tornadoes moved through Mayfield, a small town in Kentucky.The storm caused widespread destruction there and killed at least eight people.The eight people confirmed dead in Mayfield worked in a candle factory that was destroyed in the storm.Eight more workers at the factory remain missing.Kentucky Governor Andy Beshear had earlier feared up to 100 people may have been killed in his state.But on Sunday he reduced that estimate down to as low as 50.Mayfield is a town of about 10,000 people.Judy Burton is a Mayfield local who spoke to The Associated Press about the storm.She said she was able to take shelter in the basement of her apartment building with her dog and other people before the tornado hit.