The CYGNSS constellation of eight satellites has been operating in low inclination (tropical) Earth orbit since December 2016. Each satellite carries a four-channel bistatic radar receiver that measures GPS signals scattered by the Earth surface. Over ocean, surface roughness, near-surface wind speed, and air–sea heat flux are estimated. Over land, near-surface soil moisture and flood inundation are estimated. The measurements are unique in several respects, most notably in their ability to penetrate through all levels of precipitation, made possible by the low frequency at which GPS operates, and in the frequent sampling of extreme weather and complete sampling of the diurnal cycle, made possible by the large number of satellites. The mission is currently in its continuous science phase of operation. Level 2 science data products are in development for near-surface (10 m referenced) ocean wind speed, ocean surface roughness (mean square slope), and latent heat flux. Level 3 gridded versions of the L2 products are available. A set of Level 4 products are also in development for direct tropical cyclone overpasses. These include the storm intensity (peak sustained winds) and size (radius of maximum winds), its extent (34-, 50-, and 64-knot wind radii), and its integrated kinetic energy. The use of CYGNSS Level 1 scattering cross section and L2 wind speed data products to improve hurricane numerical weather predictions is also under investigation. We expect the oral and poster presentations in this session to include some or all of the following topics: mission overview and status update; assessments of science data product quality; and results of scientific investigations using CYGNSS data products, including tropical cyclones, tropical convection and convectively coupled waves, air—sea interaction, soil moisture, and flood inundation