Weather Radar Technology Beyond NEXRAD (2002) / Chapter Skim
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5. Automated and Integrated Products
5. Automated and Integrated Products
Pages 46-53
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From page 46... ...
Investigations into nowcasting and into the assimilation of radar data into numerical weather prediction (NWP) and hydrologic models have revealed additional demands on the radar data and the derived products.
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From page 47... ...
To alleviate data latency issues for all algorithms, it is necessary either to have a fixed scan strategy that is suitably rapid for all circumstances or to have an adaptive scan strategy that can concentrate radar resources effectively. Operational mechanical scanning radars are usually restricted to 360-degree scans, with each rotation taking 15-20 seconds.
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From page 48... ...
Comprehensive and accurate boundary layer wind and reflectivity information is required for the successful nowcast of convective storm development and precipitation rate. · Accurate precipitation-type identification is required for improved QPE nowcast.
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From page 49... ...
Several methods for the physical initialization of models using estimated precipitation rates from satellite observations have been applied in global models in the tropics (e.g., Krishnamurti et al., 1993; Treadon, 1996; Falkovich et al., 2000~. These methods change the model initial conditions during a period before the start of the forecast, forcing the model to produce rain where observed and eliminating it where satellites indicate no precipitation.
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From page 50... ...
Subjective forecasting and nowcasting would also be greatly benefited by such datasets. Recommendation The value of radar data, as part of an integrated observing system, in diagnostic applications nowcasting systems, and hydrologic and numerical weather prediction models should be considered in the design of the next generation weather radar system.
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From page 51... ...
When a replacement radar system is installed, it will be critical to retain continuity in observational content and, as much as possible, to retain formats to ensure preservation of the climatic record for analysis and assessment of changes. The possible relationships of weather variability associated with global climate changes such as temperature and sea state changes are of particular importance, and the availability of a consistent weather radar database within this context will be critical to making and/or validating associated assessments.
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From page 52... ...
These considerations are far-reaching. Recommendation Plans for next generation weather radar systems should include provisions for real-time dissemination of data to supportforecast, nowcast, and warning operations and data assimilation for numerical weather prediction, and certain research applications.
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From page 53... ...
highly directed aids for meteorological users that provide forecasters with improved assistance in operational warning and forecast needs and (2) a potpourri of nonmeteorological products and decision aids for nonmeteorological users such as those in the civil and military aviation sectors, the newly emerging intelligent surface transportation systems (e.g., smart cars and trucks)
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