Graduate Thesis Or Dissertation
 

A radar and synoptic study of rain at a point

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  • A radar echo-contour height measurement at different gain settings of the receiver, from RHI pictures shows that heavy rain occurs at the points above which steep echo-contour gradients appear. In this study, radar data came from the AN/CPS-9 radar located at McCulloch peak, about five miles from the Oregon State University campus. The data for rain intensity and drop-size distribution came from filter paper rain-drop recorders exposed by observers situated at various positions beneath the radar beam at different azimuth. The occurrence of heavy rain intensity at a point with the appearance of steep echo-contour gradient showed more consistency for convective and cold front showers than with warm front showers. In the case of convective showers it appears that strong echo-contour gradients lying near the freezing level do not necessarily associate with rain. The study of drop-size distribution shows that steep echo-contour gradients also occur with the expansion of the distribution pattern towards bigger drop sizes, thus indicating the presence of up-draft with steep echo-contour gradient.
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