A comparison of NEXRAD WSR-88D rain estimates with gauge measurements for high and low reflectivity gradient precipitation events.

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Rain gauge measurements were compared with radar-estimated storm total precipitation for 43 rain events that occurred at ten locations. Gauge-to-radar ratios (G/R) were computed for each case. The G/R ratio is strongly related to precipitation type, with the mean G/R slightly less than 1.00 for high-reflectivity gradient cases and greater than 2.00 (factor of 2 radar underestimation) for low-reflectivity gradient cases. both precipitation types indicated radar underestimate at the nearest ranges. However, the high-reflectivity gradient cases indicated radar overestimation at further ranges, while the low-reflectivity gradient cases indicated significant radar underestimation at all ranges. Occurrences of radar overestimates may have ... continued below

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11 p.

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Jendrowski, P.; Kelly, D. S.; Klazura, G. E. & Thomale, J. M. April 14, 1999.

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Rain gauge measurements were compared with radar-estimated storm total precipitation for 43 rain events that occurred at ten locations. Gauge-to-radar ratios (G/R) were computed for each case. The G/R ratio is strongly related to precipitation type, with the mean G/R slightly less than 1.00 for high-reflectivity gradient cases and greater than 2.00 (factor of 2 radar underestimation) for low-reflectivity gradient cases. both precipitation types indicated radar underestimate at the nearest ranges. However, the high-reflectivity gradient cases indicated radar overestimation at further ranges, while the low-reflectivity gradient cases indicated significant radar underestimation at all ranges. Occurrences of radar overestimates may have been related to high reflectivity returns from melting ice, bright-band effects in stratiform systems and hail from convective systems. Bright-band effects probably were responsible for improving the radar underestimates in the second range interval (50-99.9 km) for the low-reflectivity gradient cases. Other possibilities for radar overestimates are anomalous propagation (AP) of the radar beam. Smith, et al. (1996) concluded that bright band and AP lead to systematic overestimate of rainfall at intermediate ranges.

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11 p.

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OSTI as DE00011754

Medium: P; Size: 11 pages

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  • 29th International Conference on Radar Meteorology, Montreal, Quebec (CA), 07/12/1999--07/16/1999

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  • Report No.: ANL/ER/CP-98756
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 11754
  • Archival Resource Key: ark:/67531/metadc622391

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  • April 14, 1999

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  • June 16, 2015, 7:43 a.m.

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  • April 6, 2017, 7:25 p.m.

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Jendrowski, P.; Kelly, D. S.; Klazura, G. E. & Thomale, J. M. A comparison of NEXRAD WSR-88D rain estimates with gauge measurements for high and low reflectivity gradient precipitation events., article, April 14, 1999; Illinois. (digital.library.unt.edu/ark:/67531/metadc622391/: accessed October 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.