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<br />~ <br />~-~. <br />f ! <br />,-- <br />, <br />L <br />~, <br />I <br />I <br />, <br /> <br />~ <br /> <br />; <br />, <br />r. <br />,. <br />[ <br />t <br /> <br />f <br />, <br /> <br />t <br />I' <br />f <br />, <br />, <br />~; <br />f'~ <br />>--- <br /> <br />, ' <br />~ . <br />I <br />t <br /> <br />i- <br />, <br /> <br />, <br />, <br />\ <br /> <br />RADAR-RAINFALL DATA <br />FOR THE GREAT FLOOD OF 1993 <br /> <br />by <br /> <br />David C. Curtis' <br />DC Consulting <br /> <br />Joe D'Aleo' <br />WSI Corporation <br /> <br />Lee Larson3 <br />National Weather Service <br /> <br />The Great Flood of 1993 along the Mississippi River saw forty-six river monitoring stations in <br />nine states reporting flows in excess of the 100-year flood. Forty-two stations reported record <br />flows, some more then twice the previous records. Over 100,000 square miles of the Mississippi <br />River basin experienced signilicant flooding. <br /> <br />A radar-based rainfall data set has been developed for the period April 1 - August 31, 1993. The <br />radar-rainfall estimates were developed on a grid with 2 km x 2 km (1.5 mi.%) cells every 15 <br />minutes. That data set includes rainfall estimates for more than 600,000 cells for the five month <br />period. <br /> <br />The radar based rainfall data set is compared with a second data set including rainfall <br />measurements from a network of traditional rain gauges. The rain gauge data was used in NWS <br />flood forecast operations during the Great Flood of 1993. The results of the data base <br />comparison are analyzed and presented in this paper. <br /> <br />David C. Curtis, Ph.D., DC Consulting, 9477 Greenback Lane, #522A, Folsom, California 95630, Tel. <br />(916) 988-2771 <br /> <br />Joe D'Aleo, WS1 Corporation, 4 Federal Building, Billerica, MA, 01821, Tel. (508)670-5119 <br /> <br />Lee Larson, National Weather Services, Kansas City, Missouri <br />