James Aanstoos, Department of Geological and Atmospheric Sciences, Iowa State University


This paper presents the comparison of rainfall estimation from X-band dual-polarization radar observations and NEXRAD observations to that of rain gauge observations. Data collected from three separate studies are used for X-band and rain gauge observations. NEXRAD observations were collected through the NCEI archived data base. Focus on the Kdp parameter for X-band radars was important for higher accuracy of rainfall estimations. The Unidata IDV was used to evaluate the rainfall estimates of NEXRAD observations. The rainfall estimation models were then evaluated versus gauge data using significance testing. It is shown that the Xband radar has a lower p-value thus indicating that the X-band radar is better in predicting rainfall accumulations. Average rain intensity (ARI) was then calculated approximately every 30 minutes to show that the NEXRAD radar is able to show periods of increase rain rate. The results show that the methodology works well at interpreting rain rates and rainfall estimations by X-band and partially by NEXRAD for the events analyzed herein.

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Brady E. Newkirk


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