Discussion
Which quantity does a drought index attempt to capture?
Answer: A
Drought is a relative concept, since a rainfall total that would be normal in a desert would be an extreme drought in a rainforest, so indices measure departures from the local distribution. Consecutive dry days is one simple measure among many. The relativity is why a single global threshold cannot work and why several indices coexist for different purposes. Most errors here come from carrying a result across from a neighbouring case where it does not hold.
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