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That question drives everything from weather forecasting to emergency response. And a decades-old citizen-science initiative driven by ordinary volunteers generates some of the nation’s unique — and useful — precipitation data. It’s called the Community Collaborative Rain, Hail & Snow Network (CoCoRaHS), a nonprofit network that works to measure and map rain, hail and snow. Although it began in Colorado, the network now has volunteers in all 50 states and even other countries throughout the Northern Hemisphere.