In Baltimore and across central Maryland, a severe thunderstorm warning and a heat advisory have been issued by the National Weather Service until Friday.

The alert from the weather service’s Storm Prediction Center in Norman, Oklahoma means conditions are favourable for storms exceeding 58 mph winds and one-inch pieces of hail, according to reports from the Baltimore Sun.

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According to the National Weather Service’s Baltimore/Washington division, the warning is in force until 5.30 pm in Baltimore City, southwestern Baltimore County, Columbia, Ellicott City, and Glen Burnie.

Warning the residents, the NWS tweeted: “Some of the storms today are packing winds of over 70 mph! If you hear thunder or a warning is issued, GET INSIDE and STAY AWAY FROM WINDOWS!”

Meanwhile, meteorologists advise inhabitants to seek shelter in an inner chamber on the lowest floor of a structure.

Trees were falling through the second floor of a residence, cars stuck on flooded highways, and trees and toppled utility poles obstructed streets, described by city police dispatchers, according to the Baltimore Sun report.

Just before 6 pm, Baltimore Gas and Electric reported 291 homes without electricity.

Anne Arundel, Baltimore, Calvert, Caroline, Carroll, Cecil, Charles, Dorchester, Frederick, Harford, Howard, Kent, Montgomery, Prince George’s, Queen Anne’s, St. Mary’s, Talbot, and Washington counties are all under a severe thunderstorm watch, according to the National Weather Service. The warning will last until 8 pm.

“During the watch, people should review severe thunderstorm safety rules and be prepared to move a place of safety if threatening weather approaches,” the weather service advised.

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Meanwhile, the NWS also issued a heat advisory until 7 pm for “dangerous heat and humidity” in much of Central Maryland Friday, with heat indices between 100 and 107 degrees.

“The combination of the high heat/humidity will lead to quite the unstable atmosphere,” the meteorologists wrote in their forecast discussion for the region.