The WSR-88D provides high sensitivity, angular resolution, and transmit–receive stability, all of which support high-quality observations of weather variables. A research-to-operations (R2O) strategy for the PAR alternative for the WSR-88D replacement network is presented. Finally, we describe progress in developing methods to compensate for polarimetric variable estimate biases introduced by electronic beam-steering. Simulations are used to evaluate techniques for rapid volumetric scanning and assess data quality characteristics of PAR. Analysis of benefits that might be so realized indicates the possibility for additional improvement in severe-weather and flash-flood warning performance, with associated reduction in casualties. Changes in the number and/or locations of radars in the future network could improve coverage at low altitude. We assess these benefits using storm observations and analyses, observing system simulation experiments, and real radar-data assimilation studies. Research indicates PAR can plausibly achieve fast, adaptive volumetric scanning, with associated benefits for severe-weather warning performance. A key alternative being evaluated is polarimetric phased-array radar (PAR). This article summarizes research and risk reduction that will inform acquisition decisions regarding NOAA’s future national operational weather radar network.
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