The NWS Chicago/Romeoville Doppler Radar (KLOT) will remain offline today. While the radar is able to function, there remains significant calibration errors that result in a degradation of the radar data. Parts have been ordered to correct this issue. This is tied to a lightning strike to the facility which occurred on August 31st.
Alternate nearby radar locations can be found below, including FAA radar data:
FAA Terminal Doppler Weather Radars (TDWR):