Forecasters say a tornado that hit Little Rock's suburbs and killed 15 people had winds approaching 200 mph.
Sunday's storm was rated as a "high-end" EF4 on a scale of tornado strength. The EF4 rating is the same as that given to a storm that killed 13 people on Feb. 5, 2008.
Storms rated EF4 have winds between 166 and 200 mph.
Arkansas hasn't had a top-of-the-scale storm since April 10, 1929, when a twister formed south of Batesville in Independence County and struck Sneed in northern Jackson County. That storm was rated F5 on a previous scale and killed 23.