Damaging winds along with a chance of hail and tornadoes are threatening states across the Southeast as a large swath of the country braces for severe weather for the rest of the weekend, forecasters said.

Over 1.5 million people were under tornado watches in Arkansas the morning of June 7. States in the Southern Plains region to the Carolinas are at risk for clusters of strong to severe thunderstorms moving rapidly, the Storm Prediction Center said. The storms will progress eastward throughout the day.

Heavy rainfall is also expected to pose a risk of flash flooding in some of the areas affected by storms, particularly across the mid-South and another cluster of states in New England, the National Weather Service said on June 7. Millions were under flood watches throughout Oklahoma and parts of the Texas Panhandle and southwestern Missouri; as well as parts of New York, Pennsylvania, Connecticut, Massachusetts, Vermont and New Hampshire.

The multi-day severe weather event could impact over 100 million people in total east of the Rockies through the weekend, AccuWeather reported. Major cities in the storm paths include Atlanta, Chicago, Dallas and Oklahoma City, according to the outlet.