It should be pointed out that a climatological GEV
distribution assumes the stationarity of the data; that is,
there is no systematic change in the data record and no
such changes will occur. Several studies have reported
nonstationarity of precipitation records in some regions
during the last half-century (Towler et al. 2010; Cheng
et al. 2014). Because of the short record of the TRMM
data, nonstationarity is not considered at the present;
however, this does not imply that the TRMM data do
not present any measurable trend in the extreme precipitation.
Nonstationarity should be considered in future studies when the TRMM–GPM data record becomes
longer (Katz 2010; Gilleland and Katz 2014,
manuscript submitted to J. Stat. Software).