"A dangerous, widespread heat wave will bake the central and eastern U.S., bringing the hottest temperatures of the year and uncomfortably muggy air to the Midwest and Northeast that in some areas could last into much of next week,

The temperature made it to 91 on Saturday in Philly, and by the end of the workweek, that kind of heat may seem like a cool shower. By then, said Zack Taylor, chief of the analysis section at the National Oceanic and Atmospheric Administration’s Weather Prediction Center,

Dangerous weather is threatening much of the U.S., with deadly tornadoes in North Dakota and a life-threatening heat wave from Colorado to Maine.