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<br /> 6 <br /> 5 <br />::E 4 <br />~' <br />" 3 <br />-'" <br />" 2 <br />Ci <br />;2 <br />::; <br />,- 0 <br />;;; <br />;- .1 <br />- .2 <br />VJ <br />, <br />Z -3 <br /> -4 <br /> .5 <br /> .6 <br /> -9 -K .7 -6 <br /> <br />~ <br />::E <br />~ <br /> <br />" <br />-'" <br />" <br />Ci <br />'0 <br />c <br />" <br /> <br />,- <br />;:; <br />;- <br /> <br />c <br /> <br />VJ <br />Z <br /> <br />,~1ES1 <br />to 20 30 35 40 45 50 54 58 <br />u, CSU-CHILL 210K MUT: UIlZ, KUI' (White), ZUJ{(llIurk) <br />K <br />7 <br />6 <br /> <br />tional settings, especially warn, <br />ing situations, extensive data <br />processing and/or tuning of ra, <br />dar rain-rate relationships in real <br />time is impracticaL Therefore it <br />is necessary to examine the rela, <br />tive accuracy of radar-rainfall <br />measurements in postevent pro- <br />cessing, Here the word "accu- <br />racy" refers to the amount of <br />rainfall measured by the radar <br />compared to that measured by <br />the rain gauge network. <br />Herein, we briefly discuss <br />several radar estimates of the <br />maximum Storm Total Precipi, <br />tation (STP) for the FCL flood <br />(Table 2), The rainfall estimates <br />were computed using KCYS <br />Level II reflectivity data, and <br />CSU-CHILL reflectivity and <br />polarimetric data, The data were <br />gridded with a horizontal spac- <br />ing of 500 m at an elevation of <br />approximately I lan, Reflectivity, <br />based rain rates were computed <br />for each grid point using the <br />NEXRAD Z-R relationship (Z = <br />300R'4) applied to both untrun- <br />cated and truncated reflectivity <br />(53 dBZ) values, Given the ap' <br />parent tropical nature of the <br />convection, two tropical Z-R <br />relationships (Table 2) were <br />also utilized (Short et aL 1997; <br />Rosenfeld et aL 1993) for com, <br />parative purposes, Rain rates <br />were integrated over the 5,h du- <br />ration of the storm to compute <br />the STP, Level II data from <br />the Denver NEXRAD radar <br />(KFfG) were unavailable dur, <br />ing the initial phase of the analy' <br />sis, though a recent service <br /> <br />FIG, 18, Horizontat cross section at 1.2 Ian AGL ofCSU-CHILL radar data at 2108 MDT 28 July 1997, (a) Reflectivity (shaded), <br />2DR (black contour), and KDP (white contour). The 2m: is contoured every 0.3 dB starting at 1.2 dB. KIll' is contoured every 0.50 km-' <br />starting at 10 lan-I. (b) Rainfall rate in mm h-1. The blended R(KDP' ZnR) rain-rate product is shaded as shown and the NEXRAD Z-R <br />rain rates are contoured at the same rainfall intensities for direct comparison (1, 10,20,30,40,50,70,90, and 110 mm h-I). The plane <br />of the vertical cross sections shown in Fig. 17 for the same time are indicated by a dashed blue line. <br /> <br />.. <br /> <br />210 <br /> <br />5 <br /> <br /> <br />4 <br />] <br />2 <br />I <br />() <br />-I <br /> <br />.2 <br /> <br />.3 <br />-4 <br />-5 <br />-6 <br /> <br />.9 -8 .7 -6 -5 -4 .3 -2 -I () <br /> <br />2 3 456 <br /> <br />7 K 9 <br /> <br /> <br />.5 -4 -3 -2 .( 0 ( 2 3 4 5 6 <br />E-W of Taft and Drak~ (KM) <br />r I ,~I=I I , , <br />10 20 30 40 50 70 90 110 <br /> <br />7 K 9 <br /> <br />Vo/' 80, No, 2, Februory 1999 <br />