Accession Number : AD0824157

Title :   INVESTIGATION OF THE QUANTITATIVE DETERMINATION OF PRECIPITATION BY RADAR.

Descriptive Note : Interim rept. no. 2, 1 Apr-30 Sep 67,

Corporate Author : ILLINOIS STATE WATER SURVEY DIV URBANA

Personal Author(s) : Mueller, E. A. ; Sims, A. L. ; Cataneo, R.

Report Date : DEC 1967

Pagination or Media Count : 54

Abstract : The results of two years of radar measurement of rainfall amounts over the Kankakee rain gage network has shown that the accuracy is not greatly different than the accuracy over the much closer East Central Illinois network. In either case if the standard error of estimate of radar amounts is chosen as a measure of the error, a result of about 0.2 inch for storm total is obtained. Results of preliminary study of extrapolation of radar rainfall equations to other parts of the world is reported. A method depending upon the percentage of rain days which are thunderstorms and the relative humidity at a level of 0.5 km has been tentatively chosen. A survey report on the relationships between rainfall rate and radar reflectivity in the measurement of precipitation shows that the relationships introduce less uncertainty than the errors in present day radar measurement of reflectivity. (Author)

Descriptors :   *METEOROLOGICAL RADAR), (*RAINFALL, NETWORKS, ILLINOIS, ATMOSPHERIC PRECIPITATION, REFRACTIVE INDEX, MEASURING INSTRUMENTS, RAINDROPS, COMPUTER PROGRAMS, ACCURACY, RANGE(DISTANCE), THUNDERSTORMS, PLAN POSITION INDICATORS, PARTICLE SIZE, HUMIDITY.

Subject Categories : Meteorology
      Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE