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John M. Peters, Christopher J. Nowotarski, and Gretchen L. Mullendore

of supercell updrafts either, and the connection between helical flow in supercell updrafts and entrainment remains purely speculative. Of course, rigorous tests of either of these hypotheses were nearly impossible at the time, since simulations of deep convection only begin to develop a realistic inertial subrange of turbulence when the horizontal grid spacing is less than 250 m (e.g., Lebo and Morrison 2015 ), and computational resources largely precluded the use of grid spacing less than 1 km

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