By the CNN Wire Staff
(CNN) – People in a huge swath of the United States are being urged to seek out shelters as needed on Sunday as a historic heat wave continues to bring sizzing temperatures — including to some who have lost power.
Extreme heat is the leading cause of weather-related deaths in the United States.
Twenty states were either partially or entirely under excessive heat warnings or heat advisories on Sunday, according to the National Weather Service. Temperatures over 100 degrees Fahrenheit were expected in much of the Southeast.
New York City was among the sites in the Northeast facing heat advisories. The National Weather Service said the advisory would be in effect from noon until 7 p.m. ET for the city, with temperatures expected in the mid-90s. When combined with humidity, it could feel like 100 degrees.
Over the past week, nearly 1600 high…
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