This session welcomes studies of both the macro- and microproperties of tropical ice clouds using in-situ and remote sensing observations as well as high-resolution models. Topics of interest include but are not limited to 1) radiative effects of tropical ice clouds and associated uncertainties and anvil cloud feedbacks on warming; 2) the role of high clouds in driving tropical circulations, both in current-day and future climate; and 3) ice-phase condensate in mesoscale convective systems, tropical cyclogenesis, and other forms of tropical convective organization. We also welcome studies focused on ice cloud outflow in convective tracking data, ice microphysical sensitivities of climate-relevant variables, or analyses from the HAIC-HIWC, ATTREX, StratoClim, or ACCLIP campaigns.