Recently a method has been described (Wilks and Eggleston 1992) which allows adjustment of gamma distributions representing monthly or seasonal precipitation totals in a manner consistent with the 30- and 90-day precipitation outlooks issued by the Climate Analysis Center (CAC) (Epstein 1988, Wagner 1989). The approach is analogous to that of Lehman (1987), which adjusts the parameters of Gaussian distributions representing average temperatures on the basis of the outlook probabilities for temperatures. The motivation in both cases is to allow users to evaluate probabilities for outcome thresholds other than the two (the 30th and 70th percentiles) to which the outlooks directly pertain.
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