Forecasters have warned of more dangerously high temperatures Saturday in the eastern part of the United States with the possibility of severe thunderstorms, according to the National Weather Service.

Excessive heat warnings were issued by the service for parts of Maryland, Delaware, Pennsylvania, D.C., Virginia, North and South Carolina, Georgia, Indiana, Ohio, Illinois, Missouri, Kansas, Kentucky, Alabama, Tennessee and Arizona.

According to Weather.com severe thunderstorms could put areas from Iowa to Mid-Atlantic at risk, and another round of "widespread damaging winds may materialize in these hard-hit areas."

 Recently violent storms that followed extremely high temperatures wiped out power to more than 2 million people from Indiana to New Jersey, in the eastern United States.

In Virginia, two deaths were recorded including a 90-year-old woman asleep in bed, who died when a tree slammed into her home. Others who were injured include a park officer, who was hurt by an uprooted tree, and an 18-year-old man who was struck by a power line, said Fairfax County police spokeswoman Mary Ann Jennings Saturday.

West Virginia Gov. Earl Ray Tomblin declared a state of emergency after more than 500,000 were left without electricity.

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In Washington, D.C., area, Metrorail subway trains were returned to their endpoints due to the storms.

In Indianapolis more than 20 elderly residents at an apartment home had to move to a Red Cross facility and other accommodations when the apartment lost power due to a downed tree.

Reuters reported two other fatalities caused by heat in Tennessee. Two brothers aged 3 and 5 died after playing outside in the intense heat on Thursday.

Other heat-related deaths are being investigated.