The authors express their gratitude to Dr. H. Ishikawa for invaluable insights.
This study utilized the GSM dataset provided by the Japan Meteorological Agency (JMA).
The dataset was obtained from the following website:
JMA GSM Dataset.
This work is supported by the Ministry of Education, Culture, Sports, Science and Technology (MEXT) KAKENHI Grants 17H02956 and 17K14398.