Conflicts of Interest The authors declare no conflicts of interest. Data Availability Statement The upper air ERA5 reanalysis data were obtained from https://www.ecmwf.int/en/forecasts/datasets/reanalysis-datasets/era5. The tropical easterly wave tracking algorithm follows Belanger et al. (2017) and is available from ftp://ftp.ncdc.noaa.gov/pub/data/aewc-v1/src/src_readme.docx. The upper air NCEP-NCAR data are available from https://psl.noaa.gov/data/gridded/data.ncep.reanalysis.html.
