The intensity of a
tornado is measured by the damage it makes on
man made structures, vegetation. Direct measurement of the wind speed,
pressure, etc inside a tornado cannot be measured accurately with
most of the cases. So, this indirect way of measuring the
strength of the
tornado is followed.
The scale for the
measurement, called ‘Fujita-scale’ or F-scale, was
introduced by T.
Theodore Fujita of the meteorology
University of Chicago, United states.
The categorization of
a tornado in the
F-scale is done by:
estimation of the damage
of the marks and patterns, the tornadoes leave, on the ground;
the data obtained from the radars
the eyewitnesses etc.