“…Therefore, it is increasingly recognized that nonstationary probability distribution models should be assessed, and if they provide an improvement over stationary models, they can be implemented for effective risk management and design (Cheng, AghaKouchak, Gilleland, & Katz, 2014; Katz, 2013; Salas & Obeysekera, 2014). Frequency analyses of hydro‐climatic extremes that account for nonstationarity are attracting attention and a number of efforts have been reported in the literature addressing this issue (Li & Tan, 2015; Shiau & Liu, 2021; Su & Chen, 2019; Tan & Gan, 2015; Villarini et al, 2009; Villarini, James, & Napolitano, 2010; Yan, Xiong, Liu, Hu, & Xu, 2017). In nonstationary frequency analysis, distribution parameters are assumed to vary with the explanatory variables over time (Zhang, Gu, Singh, Xiao, & Chen, 2015).…”