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US Climate Reference Network
US Historical Climatology Network - Modernization

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  • pdf document Technical Note  discussing the Geonor precipitation algorithm for calculating a single precipitation from three wires: Objectives for this change include allowing the inclusion of light precipitation, minimizing the number and magnitude of false reports, minimizing the effects of small-amplitude temporal variations in gauge depths, and minimizing the impact of extraordinary events such as gauge emptying, wire breaks, and the addition of antifreeze or oil.

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