After a record heat wave accompanied by deadly thunderstorms hit the mid-Atlantic over the weekend, more than three million people are still without power across the region, Reuters reports.

Emergencies were declared in Washington D.C., Maryland, Ohio, Virginia and West Virginia on Saturday due to the damage of the overnight storms, which unleashed hurricane-force winds across and a 500-mile (800-km) stretch along the east coast.

The powerful storms left at least 13 people dead.

Officials in some areas say power repairs could take up to a week, as heat advisories remained in effect on Sunday, with temperatures reaching over 100 degrees Fahrenheit around the country.

According to the National Weather Service, temperature records for June were broken on Friday in Washington, Tennessee, Kentucky and Georgia with temperatures reaching at least 104 F in multiple cities.

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