Describe the Enhancement

The CDP threshold type in MET is for "climatological distribution percentile" thresholds. This threshold type requires that the climo mean and standard deviation be defined. When they are, a threshold like <CDP33 is applied by computing the 33rd percentile of the climo distribution (assumed normal) at each grid point. NOAA/CPC produces probability forecasts of being in the lower (<33), middle (33 to 67), and upper (>67) terciles. When computing statistics, MET must determine the probability of event for the climatology. For simple thresholds like, CDP67, the climatological probability is simple and constant... namely there's a 33% probability of being in the lower tercile and a 33% probability of being in the upper tercile. And the existing code handles those just fine.

The problem is that the MET library code does NOT currently handle complex thresholds like >=CDP33&&<=CDP67. It cannot determine that the climatological probability of being in the that range is 34%. This issue is to enhance MET to handle this type of complex CDP threshold. Specifically, enhance the logic of derive_climo_prob() in pair_base.cc.

Currently the percentile type for complex thresholds is undefined. Recommend enhancing that logic to return CDP if all simple threshold which comprise it are of that type.

Time Estimate

1 day

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