Flash floods reeking havoc in the streets of chicago today. floodwaters stranding multiple cars and shutting down major expressways. this comes after what the national weather service calls a chicago s heaviest rain event in over 40 years. the wet weather also forcing nascar to make changes to its first ever chicago street race. crews have been working all day to dry the roads to attempt today s cup series event, which has not yet started. saturday s race was halted and won t even be finished. meantime, 63 million people are under heat alerts today. temperatures from california to the gulf coast are currently in the danger zone. 106 degrees in fresno. 113 in phoenix. and a mild 95 in new orleans. cnn meteorologist allison chinchar has more on the wild weather this weekend. paula, nearly 100 million people are still under the