Climatology of Tornado Outbreaks in the Eastern United States
Two metrics are developed to objectively assess and rank the intensity of each tornado outbreak in the climatology: 1) Work: The wind force of each tornado, estimated by its maximum F/EF level, multiplied by its track length and summed up across all of the tornadoes in the outbreak; 2) Fujita Miles: the track length of each tornado multiplied by its maximum F/EF level and summed up across all of the tornadoes in the outbreak. An adjustment factor is applied to each metric to account for variations in the intensity of each tornado along its track. Preliminary analyses indicate that the adjusted wind force of the tornadoes in each outbreak is highly correlated with the total adjusted Fujita Miles. These metrics are also used to assess the intensity of several recent tornado outbreaks from 2011 and 2012 and see where they rank among other major outbreaks in the historical record.