Last week I wrote about tornadoes and the Fujita Scale, introduced in 1971 by Dr. T. Theodore Fujita to categorize tornados by intensity and area and to estimate wind speeds. Shortcomings led to the 1992 updating that became known...

...about weather warnings, tornado talk and the Fujita scale (F-scale). The latter was introduced in 1971 by Dr. T. Theodore Fujita as a way of categorizing tornadoes by intensity and area and to estimate wind speeds. The scale is divided into...