Hail Detection by Polarimetric Radar

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Hail Detection by Polarimetric Radar
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Ldr 10 log10 (Zvh / Zhh)
Wakimoto and Bringi 1988
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HDR (Aydin et al 1986)HDRZh f(ZDR)CSU-CHILL
21 June 2001 data
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T-Matrix Scattering Model Results
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HQP DefinitionData from 10 July 2002 Pinery Storm
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COMET 2002 Project Procedures

• Four PPI sweeps between 0.5 and 3.5 deg.
• HQP calculated from sweep one in each volume on a
  Cartesian grid.
• Hail map generated based on maximum HQP observed
  at each grid point.
• Post storm surveys conducted to hail map
  features.
• GPS readings taken at survey data points.

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CHILL LDR vs. Observed Hail Diameters
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Diameter Coded Histograms(left bin includes no
hail cases)
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Statistics with varying thresholds.75 inch hail
identification
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Conclusions

• Based upon the present verification data set, the
  statistical performance of HQP is not
  significantly better than HDR.
• Both polarimetric hail parameters are superior to
  the current WSR-88D hail indicators.
• Polarimetric variables bring along their own data
  quality issues.