National Academies Press: OpenBook

Weather Radar Technology Beyond NEXRAD (2002)

Chapter: Color Plates

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Suggested Citation:"Color Plates." National Research Council. 2002. Weather Radar Technology Beyond NEXRAD. Washington, DC: The National Academies Press. doi: 10.17226/10394.
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PLATE 2. Schematic diagram showing the concept of a single phased array antenna that scans mechanically in azimuth and electronically in elevation. In this example, two elevation groups allow coverage to 60 degrees using two rotations

Suggested Citation:"Color Plates." National Research Council. 2002. Weather Radar Technology Beyond NEXRAD. Washington, DC: The National Academies Press. doi: 10.17226/10394.
×

PLATE 1. Vertical section of reflectivity and the corresponding fuzzy logic based hydrometeor classification (adapted from Liu and Chandrasekar 2000).

Suggested Citation:"Color Plates." National Research Council. 2002. Weather Radar Technology Beyond NEXRAD. Washington, DC: The National Academies Press. doi: 10.17226/10394.
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Page 82
Suggested Citation:"Color Plates." National Research Council. 2002. Weather Radar Technology Beyond NEXRAD. Washington, DC: The National Academies Press. doi: 10.17226/10394.
×
Page 83
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Weather radar is a vital instrument for observing the atmosphere to help provide weather forecasts and issue weather warnings to the public. The current Next Generation Weather Radar (NEXRAD) system provides Doppler radar coverage to most regions of the United States (NRC, 1995). This network was designed in the mid 1980s and deployed in the 1990s as part of the National Weather Service (NWS) modernization (NRC, 1999). Since the initial design phase of the NEXRAD program, considerable advances have been made in radar technologies and in the use of weather radar for monitoring and prediction. The development of new technologies provides the motivation for appraising the status of the current weather radar system and identifying the most promising approaches for the development of its eventual replacement.

The charge to the committee was to determine the state of knowledge regarding ground-based weather surveillance radar technology and identify the most promising approaches for the design of the replacement for the present Doppler Weather Radar. This report presents a first look at potential approaches for future upgrades to or replacements of the current weather radar system. The need, and schedule, for replacing the current system has not been established, but the committee used the briefings and deliberations to assess how the current system satisfies the current and emerging needs of the operational and research communities and identified potential system upgrades for providing improved weather forecasts and warnings. The time scale for any total replacement of the system (20- to 30-year time horizon) precluded detailed investigation of the designs and cost structures associated with any new weather radar system. The committee instead noted technologies that could provide improvements over the capabilities of the evolving NEXRAD system and recommends more detailed investigation and evaluation of several of these technologies. In the course of its deliberations, the committee developed a sense that the processes by which the eventual replacement radar system is developed and deployed could be as significant as the specific technologies adopted. Consequently, some of the committee's recommendations deal with such procedural issues.

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