prev next front |1 |2 |3 |4 |5 |6 |7 |8 |9 |10 |11 |12 |13 |14 |15 |16 |17 |18 |19 |20 |21 |22 |23 |24 |25 |26 |27 |28 |29 |30 |31 |32 |33 |review

A simple, objective definition of a highdeath tornado is to take all killer tornadoes within a 5-yr window and find the 95th percentile of the death tolls associated with those tornadoes. Smoothing the 95th percentile value with a 3-point median filter, followed by an 11-point running mean, shows that it has dropped from 20–25 during the period of 1900–70 down to about 10–15 since 1975.