[A-AS02] Extreme Events: Observations and Modeling

[AAS02-12] Precipitation patterns in landfalling typhoons over Japan

*Sridhara Nayak¹, Tetsuya Takemi¹ (1.Disaster Prevention Research Institute, Kyoto University)

Keywords:Precipitation pattern, Typhoon, Spell duration

Typhoons are one of the most dangerous weather events in the world and some of them bring extensive precipitation, and cause widespread flooding on the regions along their track. Thus understanding the precipitation patterns in landfalling typhoons has a focus in many previous studies. In this study, the precipitation patterns in 120 landfalling typhoons around Japan during 2006-2019 are extensively analyzed. The best track data from the Regional Specialized Meteorological Center (RSMC) Tokyo are used to identify the typhoon tracks and the precipitation datasets from the Radar Automated Meteorological Data Acquisition System (Radar-AMeDAS) are used to analyze the precipitation patterns. The probabilities of the different spell durations of precipitation intensities over different regions of Japan with various radii from the typhoon center starting from 10 km to 300 km shows that the occurrence of typhoon induced heavier precipitations is higher compared to the typhoon induced lighter precipitations. The heavier precipitations last up to a day, while the lighter precipitations last about 12 hours. The long-lived precipitations are also noticed that last up to 2 days, but they don’t occur so frequently. The results also indicate that the pattern of spell durations are mostly same over all the regions within 300 km radius.