Operational weather radar in the United States: Progress and opportunity

The NEXRAD operational system consisting of a network of WSR-88D radars is now operational within the 50 states, as well as Puerto Rico and Guam. This technology has been enthusiastically received by weather forecasters in al l regions and climatic regimes of the country. Improvements in shea-term we ather forecasting and nowcasting have resulted, but the potential for furth er improvement is also great. Many of the advantages of the system are asso ciated with its quantitative and precise digital data, but problems related to accuracy of precipitation estimation, contamination of Doppler radar pr oducts by ground clutter, and the range folding of velocity data all deserv e attention. These problems and others are being addressed by the Operation al Support Facility of the triagencies: the National Weather Service, the F ederal Aviation Administration, and the Department of Defense. Further impr ovements to the system, in both hardware and software, will greatly enhance its capabilities for the future. These improvements are likely to include new open-system signal and data processing architectures that will greatly expand the ability of the system to produce a wide range of better and more sophisticated weather products. In addition, new capabilities such as pola rization diversity may also be added. At the same time, it is appropriate t o look forward into the future and, within a decade, to begin planning for the successor to NEXRAD.