Acknowledgements

The radar data for this analysis were provided by the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA, http://pagasa.dost.gov.ph). The study was also funded by the German government through the German Academic Exchange Service (https://www.daad.de/en/). We would like to thank Daniel Michelson, Marco Gabella, and one anonymous referee for their valuable insights and comments that significantly improved the paper.