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Figure 7.4. Forecast parameters for distinguishing between tornado and non-tornado convec-
tive storm environments as a function of elevation (ELV) in mMSL. Distribution of a measure
of surface-1 km vertical wind shear and mixed-layer LCL (from Brooks et al., 2003). (Bottom)
Box-and-whisker plots of LCL for soundings associated with supercells having spawned
''significant'' (F2 or greater) tornadoes (TOR), supercells not having spawned significant
tornadoes (SUP), and non-supercell thunderstorms not having produced any severe weather
(i.e., large hail, strong straight-line winds, or tornadoes) (ORD) (from Rasmussen and
Blanchard, 1998).
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