Rating
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
ease in
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
department at
the
University of Chicago, United states.
The categorization of
a tornado in the
F-scale is done by:
(1)
careful
estimation of the damage
(2)
observations
of the marks and patterns, the tornadoes leave, on the ground;
(3)
Analysis of
the data obtained from the radars
(4)
testimony of
the eyewitnesses etc.
