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(CNN) -
The first heat wave of the season begins Sunday and will continue through the workweek across much of the eastern United States.
Although it is not yet officially summer, nature plays by its own rules.
More than 30% of the American population will experience temperatures of at least 32 degrees Celsius or higher this week.
"The scorching hot and stifling weather of a large ridge will continue in the long term," says Kyle Theim, a meteorologist with the Atlanta office of the National Weather Service (NWS).
"Temperatures starting Monday will be between 10 and 15 degrees (Fahrenheit) above normal, and will close to record highs for both daily highs and lows," he adds.
More than 70 possible records from Sunday to Wednesday.
(CNN Weather)
It is possible that more than 70 daily heat records will be broken from Sunday through Wednesday, as a high pressure system dominates the eastern half of the US Some cities such as Atlanta, Nashville, Tennessee, Baltimore are expected to and Montgomery, Alabama, have several record hot days.
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Some places went ahead on Saturday, as temperatures reached 32 degrees Celsius, setting or tying records, such as Atlantic City, New Jersey, which reached 34.4 degrees Celsius (the old record was of 32.8 in 1992), and that of Georgetown (Delaware), which reached 33.9 degrees Celsius, surpassing the previous record of 33 in 1996.
There will be a short break of about two days in some cities in the Mid-Atlantic and Northeast.
"A strong cold front will pass between Sunday night and early Monday, finally giving us a break from the heat and humidity of summer," the NWS Boston office said.
Forecast of high temperatures in the USA (CNN Weather).
However, as quickly as the heat wears off, it will come back again.
Boston would go from 32 degrees Celsius on Sunday, to 15 and 21 on Monday and Tuesday, and then back to 32 on Wednesday.
Washington, Philadelphia and New York will experience a similar roller coaster of temperatures.
Boston, New York and Lexington, Kentucky typically see their first day of 32 degrees Celsius after June 1.
However, each of these cities will see those temperatures at least once in the next five days.
Washington is forecast to have several days above 32 degrees, including Wednesday, which is estimated to reach 36 degrees. Its average first day of 35 degrees or more does not usually come until June 21.
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Average date the first day of over 32 degrees Celsius arrives.
(CNN Weather)
The intense heat that arrives so prematurely tends to catch people off guard.
So be sure to stay hydrated, wear light-colored clothing, use sunscreen, and never leave people or pets in a vehicle on a hot day.
CNN meteorologist Gene Norman contributed to this text.
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