The TCSP TICOSONDE-AURA 2005 dataset consists of 4 soundings per day (00, 06, 12, and 18 UT) launched from Juan Santamaria International Airport, WMO station 78762, latitude 10 degrees N and 84.2 degrees W. The launch program began at 00 UT on 16 June 2005 and ended 00 UT 24 August 2005. With a very few exceptions, the sondes were Vaiasala model RS92-SGP and the ground station was a DigiCORA MW11 equipped for GPS wind-finding and upgraded for RS92 telemetry. A small number of ascents were made with RS90-AG and RS80-15G sondes. Most ascents were done with 500-g latex balloons filled with hydrogen. Exceptions included 24 ascents at 06 and 18UT in July that were piggybacked on a larger payload consisting of the University of Colorado Cryogenic Frostpoint Hygrometer (CFH) and an ECC ozonesonde. Median termination altitude for all ascents was approximately 26 km. Data were recorded at the maximum MW11 sample rate of one every two seconds. The TCSP mission collected data for research and documentation of cyclogenesis, the interaction of temperature, humidity, precipitation, wind and air pressure that creates ideal birthing conditions for tropical storms, hurricanes and related phenomena. The goal of this mission was to help us better understand how hurricanes and other tropical storms are formed and intensify.