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From the normally chilly Russian Arctic to the traditionally sweltering American South, big swaths of the Northern Hemisphere continued to sizzle with extreme heat as the start of summer more resembled the dog days of August with parts of China and Japan setting all-time heat records Friday.
In the United States a heat dome of triple digit temperatures in many places combined with high humidity oscillated from west to east. On Thursday, at least 15 states hit 100 degrees (37.8 degrees Celsius) and at least 21 high temperature marks were set or broken, according to the National Weather Service, which held 30 million Americans under some kind of heat advisory.