CLIMATE APPLICATIONS: water vapour feedback; A long-term UTH data record will be used in a wide range of process studies. Upper-tropospheric moisture is central to tracking, understanding, modelling and predicting convection and advection at low latitudes. UTH data can be combined synergistically with a wide range of other datasets such as cloud, precipitation and flow, whether derived from satellites, reanalyses or other sources, for model evaluation, variability analysis, predictability research, and perhaps most of all, physical process studies (e.g., stratospheric-tropospheric exchange and the variations in lower stratospheric water vapour.).