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Jianhua Sun and Sixiong Zhao

days during 2008, in future studies we plan to conduct climatologic analyses of IPE in China to further compare with the results of Cortinas et al. (2004) . b. The synoptic patterns in the four stages Figures 7 and 8 show the average geopotential height and anomalies at 500 hPa, the average wind, and the temperature fields at 850 hPa for the four freezing precipitation stages, respectively. Figure 7a indicates that the westerlies in the first stage could be seen forming two branches: one to

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Howard B. Bluestein

discrete echo of ∼35 dB Z or stronger is in fact associated with an updraft, even though the updraft may be removed spatially from the location of the radar echo, and may lead the location of the radar echo in time. The evolution of the cells is discussed both from a plot of individual cell locations as a function of time ( Fig. 6 ) and from series of WSR-88D plan position indicator (PPI) images of radar reflectivity from Amarillo, Texas (AMA), and DDC; Fig. 7 depicts the evolution on a 30-min time

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