Almost 66 million people were under some level of heat alert yesterday afternoon. About 150 million people will experience temperatures above 90 degrees Fahrenheit.
A heat wave is forecast to hit the East Coast and the Midwest and last through at least Friday.
Heat warnings, watches or advisories were in effect from Iowa to Maine, affecting Detroit, Cleveland, Cincinnati, Pittsburgh, Philadelphia, Boston, New York and other cities.
Records could be set in 200 cities from the Ohio Valley and the lower Great Lakes into the northern mid-Atlantic and the Northeast, according to the National Weather Service.
While much of the Midwest and the East Coast will be sweltering under a heat dome, other areas of the country are bundling up.
Parts of southern Oregon and Northern California faced a freeze warning early this morning.
Yesterday, Kirk, Oregon, had a low temperature of 19 F, making it the coldest place in the U.S. Today, forecasters are calling for a low of 38 in Kirk.
In Texas, by contrast, the country's highest temperature of the day was recorded at 114 degrees in Rio Grande Village. The area remains under extreme heat risk today
