1) A change in wind direction and an increase in wind speed with increasing height creates an invisible, horizontal spinning effect in the lower atmosphere.
2) Rising warm air currents within the thunderstorm pulls the rotating air from horizontal to vertical, into the storm itself. wind speeds increase and the area of rotation extends through much of the storm. Most strong and violent tornadoes form within this area of strong rotation.
3) A lower cloud base can identify an area of rotation known as a rotating wall cloud. This area is often nearly rain-free, this is because the moisture in the air becomes caught in the rotating winds. The rain often falls behind the rotaions.
4) Moments later a strong tornado develops in this area. Tennis ball-sized hail stones and damaging "straight-line" winds also occurred with this storm
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