No hockey stick: Cook County July heat wave deaths at least 700+ in 1995; 80+ in 1999; zero so far in 2011

Chance of thunderstorms today as heat wave continues - chicagotribune.com

No heat-related deaths have yet been reported, according to the Cook County medical examiner’s office. At least 80 deaths were attributed to the July 1999 heat wave. Four years earlier, another July heat wave was blamed for more than 700 deaths in Cook County.