May 18-21 2013 tornado outbreak Image 6
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May 18-21, 2013, tornado outbreak (Image 6)

July 10, 2014
An aerial photo showing the damage track of the Moore Tornado that struck Moore, Okla., May 20, 2013. The EF5 tornado devastated parts of the city. Twenty-four people were killed and thousands of structures destroyed--many were completely flattened. Several other tornadoes occurred during the day in areas further eastward, though the majority were weak and caused little damage. The May 18-21, 2013, tornado outbreak was significant, affecting parts of the Midwestern U.S. and lower Great Plains. This event occurred just days after a deadly outbreak struck Texas and surrounding Southern states on May 15. On May 16, a slow moving trough (an elongated region of relatively low atmospheric pressure) crossed the Rocky Mountains and traversed the western Great Plains. Initially, activity was limited to scattered severe storms; however, by May 18, the threat for organized severe thunderstorms and tornadoes greatly increased. A few tornadoes touched down that day in Kansas and Nebraska, including an EF4 near Rozel, Kan. Maintaining its slow eastward movement, the system produced another round of severe weather nearby. Activity significantly increased on May 19, with tornadoes confirmed in Oklahoma, Kansas, Iowa, Missouri and Illinois. In Oklahoma, two strong tornadoes (one was rated EF4) caused significant damage in rural areas of the eastern Oklahoma City metropolitan area; two people lost their lives in Shawnee. However, the most dramatic events occurred the next day with the devastating Moore Tornado. This image was taken by Roger M. Wakimoto while performing tornado research for the University of Colorado, Boulder. Wakimoto is the assistant director for the National Science Foundation's (NSF) Directorate for Geosciences. (Date of Image: May 2013) Credit: Roger M. Wakimoto, University of Colorado

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