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Convective Lines Lines of convective cells can also produce severe weather and substantial damage. Tornadic supercell thunderstorms can develop in squall lines. Tornadoes (non-supercell) can also appear in developing lines in which the parent storms exhibit little rotation. Supercells Terms for using data resources. CD-ROM available. Credits and Acknowledgments for WW2010. Department of Atmospheric Sciences (DAS) at the University of Illinois at Urbana-Champaign. squall lines