June 18-20, 2011 Tornado Outbreak


June 18-20, 2011 Tornado Outbreak


The following information is preliminary and subject to change based on additional data received and evaluated at the National Weather Service.   

Tornadoes occurred over a three day period across eastern Colorado, southwest Nebraska, and northwest Kansas.  Tornadoes first developed during the evening of June 18, 2011, across Cheyenne County, Colorado.  During the evening of June 19, 2011, tornadoes occurred across southwest Nebraska from northern Dundy County to northern Red Willow County.  Finally, tornadoes were reported from northern Gove County to Norton County in northwest Kansas during the afternoon and evening on June 20, 2011.  Most of the tornadoes will be rated either EF0 or EF1 on the Enhanced Fujita Scale.  However, stronger tornadoes occurred in Norton and Graham Counties in Kansas where at least one tornado will be rated an EF3.  A National Weather Service storm assessment team is currently evaluating the storm damage to make further EF ratings.    


Map of Preliminary Tornado Locations (June 18-20, 2011)



Radar Imagery

Reflectivity Data in Norton County
(June 20, 2011 - 2:12 PM CDT)



Velocity Data in Norton County
(June 20, 2011 - 2:12 PM CDT)

Storm Photos


Tornado north of Benkelman, Nebraska, courtesy of
 Jason Frederick and Al Kasten


Tornado south of Calvert, Kansas, courtesy of Cindy Boss


Tornado near Edmond, Kansas, courtesy of Rick Rostek 


Tornado 12 Miles North of Hill City, Kansas, courtesy of Gary Hyde

 Damage Photos












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