Parametric roll resonance is a well known phenomenon that, under certain conditions, induces very large amplitude roll motions that could lead to consequences ranging from simple minor issues to even catastrophic ones. The need for a parametric roll real time prediction system has been stated by the industry in the last years. This work describes the results of the scale model experiments of a stern trawler under parametric roll conditions; the objective of these tests is to characterize its dynamical behaviour in these situations, and to test in realistic conditions the roll motion forecasting system developed by the authors. Moreover, the results of these forecasts for some test cases are also presented in this work.