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Assessment of Hydrologic and Hydrometeorological Operations and Services (1996) / Chapter Skim
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GLOSSARY
Pages 44-46

The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.


From page 44...
... Ensemble forecasting: In a hydrologic modeling context, a process whereby a hydrologic model is successively executed several times for the same forecast period by the use of varied data input scenarios or a perturbation of a key variable state for each model run. A common method employed to obtain a varied data input scenario is to use the historical meteorological record, with the assumption that several years of observed data covering the time period beginning on the current date and extending through the forecast period comprise a reason able estimate of the possible range of future conditions.
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From page 45...
... Local-area forecast: In the pre-modernization and associated restructuring of NWS, a locally tailored weather forecast that was prepared and issued by a WSO based on more general forecast products received from a "parent" Weather Service Forecast Office. This process did not apply to hydrologic forecasts, which were prepared initially by River Forecast Centers and issued to the public by NWS offices with hydrologic service area responsibility.
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From page 46...
... Base reflectivity data are converted to a precipitation estimate for each grid in the radar umbrella, using a complex algorithm that includes quality control procedures, a ZIR relationship, and a bias adjustment using data from a ground-based precipitation gauge network. Several graphical and digital products are produced for Weather Forecast Office operations and subsequent processing.
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Key Terms

  • weather forecast
  • field offices
  • precipitation processing
  • flood stage
  • precipitation estimates

  • hydrologic modeling
  • hydrologic model
  • climatic data
  • geostationary operational
  • stream level

  • selected field
  • varied data
  • forecast period
  • gauge location
  • numerical forecast

  • data input
  • environmental satellite
  • national climatic
  • operational environmental
  • data center

  • radar data
  • office configuration
  • service forecast
  • using data
  • weather service

  • hydrologic models
  • stream flow
  • quantitative precipitation
  • value simulated
  • products received


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