This study was supported by NASA Grant NAG8-1425 under the auspices of the U.S. Weather Research Program. The radar data were provided under the Cooperative Agreement between the Office of Hydrology of the National Weather Service and the Iowa Institute of Hydraulic Research (NA47WH0495). We would like to thank Dr. Matthias Steiner for providing a computer code on which feature F8 is based. We appreciate Dr. Keeler’s sharing of his results on the same problem of AP detection.
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