The World Meteorological Organization (WMO) Solid Precipitation Intercomparison Experiment (SPICE) examined 9 different combinations of precipitation gauges/shields in several different environments. They then tested different functions for correction of the data for undercatch of solid precipitation. The use of high efficacy shields results in smaller uncorrected biases and higher number of 30 minute events with errors less that 0.1 mm. It appears as if there is error enhancement from correction of unshielded gauges – at higher wind speeds where measurements need doubling or tripling, the measurement uncertainty is doubled or tripled accordingly. This should be no surprise to readers of Hydrology Corner – the best way to control the quality your data is with best practices in the field.

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