Tornadoes emit electromagnetic waves in the radio spectrum and an electric field but the mechanism is still unknown There is also a correlation between production trends lightning by storm. There are no more lightning in a tornadic storm, sometimes there are none, but the researchers noted that cloud-to-ground lightning often reduced in number when the tornado reached the ground and increases when the tuba leaves. They also noted an unusually large number of positive lightning strokes increasing. These electromagnetic effects and lightning have nothing to do with the causes of tornado formation but rather be related to the stormy environment and its variations when the tornado occurs.
Colors and luminosities particular were often mentioned by witnesses but are probably due to the passage of external sources of light through the storm: street lighting, explosion of a power transformer , etc., because no internal source does. never been identified.
Finally, tornadoes are associated with changes in temperature , to humidity and atmospheric pressure . For example, when a tornado in Manchester, South Dakota June 24, 2003, a probe placed in the path noted a decrease in pressure of 100 hPa . The pressure is lowered at first very gradually approaching the vortex but suddenly its passage, while the minimum pressure reached 850 hPa , and then as suddenly as it rose. The decrease in temperature and increase in humidity were equally important and sudden .
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