Roger Allen

Date of Award


Document Type


Degree Name

Master of Science (MS)


Atmospheric Science

Committee Chair

Lawrence Carey

Committee Member

Kevin Knupp

Committee Member

Sundar Christopher


Hail., Reflectance., Radar meteorology., Polariscope.


With the growth of C-band dual-polarized radar systems in foreign weather services and research institutions, it is important for researchers and operators to understand how to use them when analyzing hail producing storms. Compared to S-band dual-polarized radars, little research has been done on the effects of hail on C-band observations. Past comparisons made between the two wavelengths consisted of small test samples. This study collected data from 35 storms with conrfirmed hail reports to make a comparison between S-band and C-band hail signatures. The study concluded that while Z(subscript H) was approximately the same across the two wavelengths, melting and resonance has a stronger effect on C-band differential reflectivity (Z(subscript DR)) and correlation coefficient (ρ(subscriptHV)) than S-band Z(subscript DR) and ρ(subscriptHV) . These attributes caused a more pronounced increase of C-band Z(subscript DR) (1 to 3 dB more) and decrease in ρ(subscriptHV) (0.03 to 0.08 less) than S-band. The larger the median C-band Z(subscript DR) is, the more different the values of Z(subscript DR) and ρ(subscriptHV) at the two wavelengths become due to C-band's higher sensitivity to resonance.



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