By fitting the GEV function to observed rainfall data
or model outputs, changes in the extremes can be
assessed by noting how these shape parameters vary in
time or under different climate forcing conditions (e.g.,
Hosking and Wallis 1997; Huntingford et al. 2003;
Schubert et al. 2008). For a given precipitation amount,
the GEV facilitates the direct estimation of the ARI by
utilizing the precalculated lookup table of precipitation
thresholds for different ARIs.