The CAMEX-4 Conically-Scanning Two-Look Airborne Radiometer (C-STAR) dataset was collected by the Conically-Scanning Two-look Airborne Radiometer (C-STAR), which was deployed during the Fourth Convection and Moisture Experiment (CAMEX-4). C-STAR data were collected at 37GHz (in the microwave part of the electromagnetic spectrum) for the period of 8 Aug 2001 through 24 Sept 2001. The CAMEX-4 missions studied hurricanes over land and ocean in the U.S., Gulf of America, Caribean, and Western Atlantic Ocean, and made use of multiple aircraft and research-quality radar, lightning, and radiosonde sites.