Graphical Abstract

Ikuta, Y., T. Fujita, Y. Ota, and Y. Honda, 2021: Variational data assimilation system for operational regional models at Japan Meteorological Agency. J. Meteor. Soc. Japan, 99,
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Plain Language Summary: The regional data assimilation system at the Japan Meteorological Agency employs a variational data assimilation system on the basis of the non-hydrostatic model ASUCA (named ASUCA-Var). As a system for operational use, ASUCA-Var is designed for sustainable development. This paper reviews configurations, workflow of operational systems, and performances of ASUCA-Var.