Amount of precipitation: USA Overview | Loop: 3 hours loop

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The precipitation-radar images show only qualitative information on precipitation.
Their quality is limited to non-quantitative information, since radar is only an indirect method of measuring precipitation, based on reflectivity. Precipitation data in mm and rate data in mm/h are approximations formed via a standard relationship between dBZ levels and instantaneous precipitation values.
For different technical reasons radar information is still incomplete and patchy (https://en.wikipedia.org/wiki/Weather_radar).