期刊
JOURNAL OF THE ATMOSPHERIC SCIENCES
卷 67, 期 9, 页码 3074-3083出版社
AMER METEOROLOGICAL SOC
DOI: 10.1175/2010JAS3416.1
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The three-dimensional axisymmetric wind field structure of the violent Spencer, South Dakota, 1998 tornado was analyzed using the ground-based velocity track display (GBVTD) method. Data from a Doppler on Wheels mobile radar, collected at very close range to the tornado, were used to conduct the GBVTD calculations at a very fine (16 m) resolution. The analysis revealed a two-cell vortex with a very strong axial downdraft throughout the observation period, radial inflow jets preceding intensification and a decrease in inflow preceding weakening, swirl ratio values consistent with observed multiple vortex structure, and other features of the vortex.
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