  Shan et al. (2023) recently reported significant seasonal advances of intense
tropical cyclones (TCs) in both the Northern Hemisphere (NH) and Southern
Hemisphere (SH) since the 1980s and emphasized the data insensitivity of this
conclusion, based on the advanced Dvorak Technique-Hurricane Satellite
(ADT-HURSAT) and the International Best Track Archive for Climate Stewardship
(IBTrACS) datasets. However, upon rigorously repeating the analysis procedure
in Shan et al. (2023), we are unable to replicate their conclusion. Our
analyses reveal that insignificant trends in median of intense TC occurrence
dates (hereafter referred to as $\tilde{date}_{intenseTC}$) are observed in the
SH based on the ADT-HURSAT, and in both hemispheres based on the IBTrACS. In
addition, we discover inconsistencies in $\tilde{date}_{intenseTC}$ trends
between the two datasets, which primarily arise from the differences in
identification of intense TC cases. The above discrepancies raise doubts about
the reproducibility and validity of Shan et al.'s conclusions regarding the
seasonal advance of intense TCs. Based on these findings, as well as the
limitations of both datasets, we argue that the reported seasonal advance of
intense TCs since the 1980s is inconclusive and further investigations with
alternative datasets and approaches are needed.
