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Valery M. Melnikov, Richard J. Doviak, Dusan S. Zrnić, and David J. Stensrud

appear differently in different azimuthal directions. Visible and infrared satellite imagery (not shown) indicates the presence of thin upper-level clouds across central Oklahoma. Observers from Tinker Air Force Base (AFB) and Oklahoma City at 1650 UTC reported cloud bases at 7.6 and 8.5 km AGL, respectively. These reported cloud bases agree well with the layer between 7.5 and 9.5 km in Fig. 1a , indicating the layer is produced by particulate scattering ( Z DR of about 1 dB) from nonprecipitating

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A. B. White, M. L. Anderson, M. D. Dettinger, F. M. Ralph, A. Hinojosa, D. R. Cayan, R. K. Hartman, D. W. Reynolds, L. E. Johnson, T. L. Schneider, R. Cifelli, Z. Toth, S. I. Gutman, C. W. King, F. Gehrke, P. E. Johnston, C. Walls, D. Mann, D. J. Gottas, and T. Coleman

, the snow-level radar network provides detail on the timing of precipitation and the depth (up to the radar’s maximum range and subject to the radar’s minimum sensitivity) of the precipitating cloud layer. For example, in the left-hand side of Fig. 10 the network depicts the time lag required for the onset of a storm’s precipitation to proceed from north to south as the storm progresses down the coast of California. Fig . 10. Time–height sections of Doppler vertical velocity and snow level

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