"Heavy rain once every 50 years" Why does it happen every year? The trick of "heavy rain reporting"

Roughly speaking Experts explain why it feels like ``heavy rains that occur once every 50 years'' occur every year. According to Associate Professor Yukiko Imada, in order to analyze data from different regions and periods separately, In recent years, historically heavy rain has been concentrated in a short period of time, and there is a structure in which it is felt more frequently. Read article