Standardized Precipitation Index
Background

What is the SPI?

What is the SPI?  Cont.

Why SPI?

A Note on Data Sources

SPI Product Development Process

Short Term SPI (1-2 months)

Seasonal SPI (3- and 6-months)

Long-term SPI (1-year or more)

Sample SPI map:  Big Island

Sample SPI map: Maui

Sample SPI map: Oahu

Sample SPI map: Kauai

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