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Is Spectral Processing Important for Future WSR-88D Radar?

This study investigates whether actual Doppler spectra display a Gaussian shape, which is vital for enhancing weather radar capabilities. Utilizing data from the KOUN radar at NSSL, this research analyzes Doppler spectra, focusing on clutter interference and the transformation of time series data to the frequency domain through Fourier Transform in MATLAB. The analysis of the tornado event on May 8, 2003, reveals that supercell storms exhibit distinct spectral characteristics, underscoring the need for advanced spectral processing in WSR-88D radar systems.

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Is Spectral Processing Important for Future WSR-88D Radar?

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  1. Is Spectral Processing Important for Future WSR-88D Radar? Carlos A. Rodríguez Rivera Mentor: Dr. Robert Palmer

  2. Goals • Determine if Actual Doppler Spectra have a Gaussian shape

  3. Definitions of Terms • Doppler Spectrum – power weighted velocity distribution within resolution volume of the radar • Clutter- unwanted echoes that interfere with the observation of signals on a radar • Range gate – the volume encompassed by one pixel of radar data

  4. KOUN Research WSR 88D Radar • Data from KOUN Radar at NSSL in Norman, Ok • Gates – can be over 1000 • Data are Time Series (Level I) • Necessary to convert to Frequency Domain with Fourier Transform using Matlab

  5. Typical Parameters of WSR 88D • Outputs (Level II): • Reflectivity (Z) • Radial Velocity (Vr) • Spectrum Width (W)

  6. Parametric Modeling of Doppler Spectrum • Assumed • Gaussian shape • Equation = • µ = Radial Velocity • σ = Spectral Width • S = Power

  7. Parametric Modeling of Doppler Spectrum

  8. Reflectivity and Velocity 313 x 24 F4 Tornado May 8,2003 in Moore, Southeast Oklahoma City and Choctaw, Oklahoma.

  9. Spectral Analysis and Gaussian Fit Actual Doppler Spectrum Gaussian Model Fit

  10. Improved Spectral Analysis Actual Doppler Spectrum Gaussian Model Fit

  11. How Close is Gaussian Model?

  12. Example of Spectra Azimuth 32.4º

  13. Examples of Spectra Azimuth 39.9º

  14. Comparison to Storm Structure

  15. Conclusions • The Supercell Storm has largest MSE near updraft region • The outflow region shows nearly Gaussian Doppler Spectra (low MSE) • Investigation of other storm types is necessary • Is Spectral Processing Important for Future WSR 88D Radar? YES!!!!!!

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