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Various different temperatures and wind interactions at different altitudes can cause a rotating updraft called a mesocyclone .
It is worth to mention that the axisymmetric circulation characteristics of the mesocyclone at its mature stage resemble a feature very similar to that observed in a mature typhoon.
One of the major differences of super cells compared to that of single-cell and multi-cells storms is that, the super cell contains a viscous rotating updraft, this rotational updraft is known as a mesocyclone .
The frequency shift is then converted to wind velocity, yielding a small region of rapidly changing wind direction, a characteristic rotational wind shear signature of the mesocyclone indicating a tornadic circulation.
Figure 2 shows the trend of average lowest altitude diameter of the mesocyclone from T - 5 to T + 1.
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