May 20th 2013 Johnson-Pettis County MO Storm Damage Assessment

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May 20th, 2013 Johnson-Pettis County Missouri Tornado

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  Tornado tracks and damage contours are based on individual damage points and should not be expected to be fully accurate down to the neighborhood level. You can click on individual survey points and get additional information about the damage, and for many of the points a photo of the damage.


The National Weather Service from WFO Pleasant Hill, Missouri completed a damage survey in Johnson and Pettis Counties Missouri for a tornado that occurred on the evening of May 20th, 2013.

A supercell thunderstorm intensified as it moved into east Johnson County, MO near Knob Noster. Initially, strong, straight-line winds created minor damage in Knob Noster. As the storm continued to develop and move east, a tornado formed about 2 miles east of Knob Noster at about 457 PM. The tornado continued from this point to the northeast for approximately 14.5 miles, damaging numerous farm out-buildings, including two large chicken farms, before disapating around 516 PM, 2 miles north of Hughesville.

Maximum EF-Scale Rating...EF1

Estimated Maximum Wind Speed...95 MPH

Maximum Path Width...200 Yards

Path Length...14.5 Miles

The storm relative velocity image below shows the tornado's parent circulation develop just east of Knob Noster and progress to the northeast towards Hughesville, MO.


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