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Analysis of Spectral Fields During Tornadic Events: KOUN Radar Observations from May 2003

This study presents analyses of spectral moments fields derived from KOUN radar data collected during a tornadic event on May 8, 2003. It explores the characteristics of equivalent reflectivity factor, mean Doppler velocity, and spectral width in both time and frequency domains. The tornado spectra were observed between azimuths of 24° and 34°, revealing multimodal and wide spectra within the tornado region. In contrast, non-tornadic regions exhibited maxima at wind velocity, with narrower widths. This research provides insights into radar observations of tornadic systems.

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Analysis of Spectral Fields During Tornadic Events: KOUN Radar Observations from May 2003

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  1. Examples of spectral fields Tornadic Spectra - May 8, 2003 Svetlana Bachmann 04/13/2005

  2. The fields of spectral moments from data collected with the KOUN radar during a tornadic event (May 8, 2003)The fields of spectral moments re estimated using both time and frequency domain methods. equivalent reflectivity factor (dBZ) mean Doppler velocity spectrum width In Time Domain In Frequency Domain

  3. Region with the tornado Spectra for azimuths from 24 to 34. Y-axis shows range gate number (1 km = 4 range gates), X-axis shows spectral coefficient number (zero velocity is in the center), color-scale shows power in logarithmic units. Tornado spectra are evident in radials 28.5, 29, 29.5, 30 at ~100th ranges gate (~ 25 km) Z v w In non-tornadic regions spectra exhibit maxima at the wind velocity. At the regions with ground clutter spectra show two maxima at wind and at zero-velocities. The width of the maxima are narrow. At the tornado region spectra are multimodal and wide.

  4. Azimuth 5 10 15 20 25 30 35 0 -35 35 Velocity Range, km Tornado

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