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Reflectivity and precipitation measurements

This is a short chapter mainly to discuss other users of radar data apart from duty forecasters.


- 3.1. Quantitative precipitation estimates


- 3.2. Reflectivity

  • Radar does not measure precipitation intensity (mm) but scattering of microwaves.
  • Scattered power (W) is converted to reflectivity (dBZ) (radar equation, assumptions made) and that further to mm/h (ZR equation, assumptions made) z -> dBZ
  • Marshal & Palmer RDSD
  • Moments of RDSD (z, R, lwc)
  • z not linear to R
  • Typical z-R relations (write as R-z relation?)
  • z of snow, graupel, hail
  • Accumulation: role of time-interval
  • vpr, melting layer (link to problems)
  • Gauge comparisons are not straightforward

Material to this section is available through:

- Laurent Delobbe: animations, PowerPoint presentations and case study material
- Iwan Hollemann: PowerPoint presentations
- Roger Deslandes: animations, PowerPoint presentations, quizzes and case study material
- Wilfried Jacobs: animations, PowerPoint presentations, case study material and other
- Urs Germann: animations, PowerPoint presentations, quizzes and other
- Evelyn Murphy: PowerPoint presentations
- Uta Gjertsen: PowerPoint presentations
- A.J. Illingworth: PowerPoint presentations and other
- Paul Joe: animations, PowerPoint presentations and case study material
- R.J. Keeler: PowerPoint presentations and other
- Martin Hagen: PowerPoint presentations and quizzes
- Peter Rodriguez: case study material and other
- Frederic Fabry: animations and other

mise jour Wednesday 4 May 2016