Las Vegas baked in its record fifth consecutive day of temperatures sizzling at 46.1 Celsius or greater amid a lengthening hot spell that is expected to broil much of the U.S. into the weekend. Las Vegas is 10 degrees hotter than New Delhi and Rajasthan's Jaipur. Even by desert standards, the prolonged baking that Nevada's largest city is experiencing is nearly unprecedented, with forecasters calling it "the most extreme heat wave" since the National Weather Service began keeping records in Las Vegas in 1937. Here's the latest update.