This is the data used for Honda et al. entitled as "Real-Time 30-s-Update Big Data Assimilation System for Convective Rainfall Prediction with a Phased Array Weather Radar". The data includes: (1) Processed data used for plotting (dat4figs_JAMES.tar.gz) (2) Source code for SCALE (scale.tar.gz) (3) Source code for domains 1–3 and the boundary preparation in domain 4 (d3-d4-scale-letkf.tar.gz) (4) Source code for a spin up of domain 4 (d4-spinup-scale-letkf.tar.gz) (5) Source code for data assimilation in domain 4 (scale-letkf-d4.tar.gz) Python scripts for data analysis and plotting (AIP_realtime/python/Fig*_JAMES.py) are available from https://github.com/takumihonda/AIP_realtime/tree/03d6cf3e1405c21b73bf2923cb6914aeb6f3634d All figures with python can be reproduced with the archived minimal data (dat4figs_JAMES.tar.gz)