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It started on May 21, 2011 when a low pressure system over the great plains generated a cold front along which severe thunderstorms formed. There was a great difference between the wind speed and direction at high and low altitudes (a condition called wind shear). This set those storms rotating, and some went on to produce tornadoes from that rotation. Tornadic activity from this system continued for several days. The strongest of those storms generated an EF5 tornado on May 22 that tragically struck Joplin, Missouri.

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13y ago

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