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Figure 6.24. Photographs of landspouts. (Top) April 22, 1981, south central Oklahoma;
(bottom) August 9, 2004, west of Limon, CO (photographs by the author).
Figure 6.25. Conceptual model of the life cycle of a non-supercell tornado. The solid line
marks the radar-detectable convergence boundary. Low-level vortices are assigned letters.
The three-dimensional wind field is indicated by arrows. In the last stage (rightmost panel)
a boundary-layer vortex (''C'') is stretched underneath an updraft in a buoyant cloud aloft
(from Wakimoto and Wilson, 1989).
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