Washington, D.C., Mayor Muriel Bowser has activated an extended heat emergency in the capital through Thursday.

“With the heat index expected to exceed 100 degrees Monday through Thursday, residents and visitors are encouraged to take precautions to avoid heat-related illnesses and to check on neighbors,” Bowser’s office said in an announcement. 

The heat index, also known as the apparent temperature, is forecast to hit triple digits this week, with actual temperatures reaching 90 degrees.

Bowser first declared a heat emergency on July 4 and later extended it to Tuesday as temperatures in the district remained scorching.

D.C. residents are advised to limit their time outdoors, keep pets indoors, drink plenty of fluids, and shelter in air-conditioned buildings and cooling centers. Residents can request transportation to a cooling center by calling the shelter hotline at (202)-399-7093 and can find the center nearest to them at heat.dc.gov.

District spray parks are open from 10 a.m. to 6 p.m., and outdoor pools are operating on individual weekly six-day schedules.

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Residents should also recognize the signs of heat exhaustion and stroke, including dry red skin, convulsions, throbbing headaches, disorientation, chills, and delirium.

More than 146 million people across the country are currently under some form of heat warning as large swaths of the East and West coasts continue to suffer from dangerous, record-breaking heat waves.