Accession Number : AD0719878

Title :   On the Quantitative Determination of Precipitation by a Radar.

Descriptive Note : Final rept. Feb 62-Oct 68,

Corporate Author : OSSERVATORIO TICINESE DELLA CENTRALE METEOROLOGICA SVIZZERA LOCARNO-MONTI

Personal Author(s) : Joss,J. ; Schram,Karin ; Thams,J. C. ; Waldvogel,A.

Report Date : 1970

Pagination or Media Count : 41

Abstract : Measurements of radar reflectivity, rainfall rate and drop-size distribution were made for three classes of rain type: drizzle, uniform steady rain, and thunderstorms. Power-law relationships of the type a(R to the b power) where Z is radar reflectivity factor, R is rain intensity, and a and b are constants, were found for the three classes of rain. For the measurement of daily rainfall amounts exceeding 10 mm, these relationships produced a standard error of estimate of plus or minus 13%. For the same data, use of a single Z-R relation of all types of rain gave a standard error of plus or minus 28%. (Author)

Descriptors :   (*RAINFALL, MEASUREMENT), (*METEOROLOGICAL RADAR, RAINFALL), ATMOSPHERIC PRECIPITATION, RAINDROPS, THUNDERSTORMS, WEATHER FORECASTING, SWITZERLAND

Subject Categories : Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE