Daily tornado frequency distributions in the United States

The authors examine daily tornado counts in the United States over the period 1994‐2012 and find strong evidence for a power-law relationship in the distribution frequency. The scaling exponent is estimated at 1.64 (0.019 s.e.) giving a per tornado-day probability of 0.014% (return period of 71 years) that a tornado day produces 145 tornadoes as was observed on 27 April 2011. They also find that the total number of tornadoes by damage category on days with at least one violent tornado follows an exponential rule. On average, the daily number of tornadoes in the next lowest damage category is approximately twice the number in the current category. These findings are important and timely for tornado hazard models and for seasonal and sub-seasonal forecasts of tornado activity.

[1]  Harold E. Brooks,et al.  Statistical Modeling of Tornado Intensity Distributions , 2003 .

[2]  K. Emanuel.  Increasing destructiveness of tropical cyclones over the past 30 years , 2005, Nature.

[3]  Laura E. Michaels,et al.  The Decreasing Population Bias in Tornado Reports across the Central Plains , 2013 .

[4]  Michael K. Tippett,et al.  Association of U.S. tornado occurrence with monthly environmental parameters , 2012 .

[5]  Bruce D. Malamud,et al.  Statistics of severe tornadoes and severe tornado outbreaks , 2011 .

[6]  Nikolai Dotzek,et al.  Observational evidence for exponential tornado intensity distributions over specific kinetic energy , 2005 .

[7]  J. Kok,et al.  The physics of wind-blown sand and dust , 2012, Reports on progress in physics. Physical Society.

[8]  Lisa Schielicke,et al.  On the theory of intensity distributions of tornadoes and other low pressure systems , 2009 .

[9]  J. V. Ramsdell,et al.  Tornado climatology of the contiguous United States , 1986 .

[10]  Harold E. Brooks,et al.  On the Relationship of Tornado Path Length and Width to Intensity , 2004 .

[11]  Nikolai Dotzek,et al.  Derivation of physically motivated wind speed scales , 2009 .

[12]  James B. Elsner,et al.  Predicting Spring Tornado Activity in the Central Great Plains by 1 March , 2014 .

[13]  Harold E. Brooks,et al.  Evolution of the U.S. Tornado Database: 1954–2003 , 2006 .

[14]  Joseph T. Schaefer,et al.  A Minimum Assumption Tornado-Hazard Probability Model , 1986 .

[15]  Nikolai Dotzek,et al.  Assessing a Tornado Climatology from Global Tornado Intensity Distributions , 2005 .