The all-season, winter, and spring models are compared in Figure 1.  The all-season winter models are most similar, but the all-season model results in slightly larger quantiles than the winter season model.  However, as was previously mentioned, multiple storm types affect the Willamette River watershed.  A mixed population analysis would be better suited to combine models for each season into a single probability distribution that reflects the occurrence of more than one type of storm in a year.

Figure 1. All-Season, Winter, and Spring 1-day Precipitation Models