Twister Road

These three video frame captures show a tornado

about 1.5 miles SW of Mapleton, Iowa around

7:25 PM, Saturday, April 9, 2011. Our chase

vehicle, driven by my son Ryan Alliss (silhouette

lower left in images), was northbound on Sumac

Avenue between 190th and 170th streets, about

six miles SE of Mapleton at this moment. Note

the dirt and debris being kicked up on the

ground ahead of the EF3 tornado (toward

the north or right). The tornado would cause

damage to about 60% of the town.