In the course of the recent WMO international instrumentintercomparison in the field and the associated specific laboratory tests,highly accurate rainfall intensity measurements have been collected and madeavailable for scientific investigation. The resulting high quality data set(contemporary one-minute rainfall intensity data from 26 gauges based onvarious measuring principles) constitutes an important resource to provideinsights into the expected behaviour of rain intensity gauges in operationalconditions and further useful information for National MeteorologicalServices and other users. A few aspects of the analysis of one-minuteresolution rain intensity measurements are discussed in this paper, focusingon the observed deviations from a calculated reference intensity based onfour pit gauges. Results from both catching and non-catching type gauges arediscussed in relation with suitable tolerance limits obtained as acombination of the estimated uncertainty of the reference intensity and theWMO accuracy limits for rainfall intensity measurements. It is shown thatsuitably post-processed weighing gauges and tipping-bucket rain gauges hadacceptable performance, while none of the non-catching rain gauges agreedwell with the reference.
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