To improve the landfalling tropical cyclone (TC) forecasting. the pseudo inner-core observations derived from the optimal-member forecast (OPT) and its probability-matched mean (OPTPM) of a mesoscale ensemble prediction system. namely TREPS. were assimilated in a partial-cycle data assimilation (DA) system based on the three-dimensional variational method. https://www.adaptsurvival.com/product-category/foulard/