CHICAGO -- Chicago saw it's warmest day in 11 months today.
Temperatures were projected at 90 for O'Hare and 93 at Midway. O'Hare reach 92.
Many flocked to area parks and beaches.
Thunderstorm development may occur rapidly over northern Illinois and NW Indiana late this afternoon, particularly between 4-8 p.m. These storms could bring hail and heavy winds.