Survey of relationships between rainfall rate and radar reflectivity in the measurement of precipitation. Stout, undefined & E. A. Mueller, G. E. 1968.
Survey of relationships between rainfall rate and radar reflectivity in the measurement of precipitation. [pdf]Paper  abstract   bibtex   
Raindrop-size distributions measured at Coweeta and eight other locations were used to derive a relationship between rainfall intensity and radar reflectivity for the purpose of using radar to estimate rainfall amount. Between geographic locations, rainfall rate varied 500 percent for the same reflectivity. Differences of 150 percent were attributed to storm type. At each site, differences within a storm were minor. For a given storm type at a specific location, errors in measurement of radar reflectivity are greater than errors of estimating rainfall from reflectivity.

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