National Weather Service: Denning, Ark., Destroyed By Tornado POSTED: 12:29 am CDT May 25, 2011 UPDATED: 12:43 am CDT May 25, 2011 FORT SMITH, Ark. -- The National Weather Service is reporting that a large, dangerous tornado has destroyed the town of Denning, Arkansas, in Franklin County, just south of Altus. The tornado hit the area about 12:15 a.m., and it continued to the northeast. Spotters reported that this large tornado was up to a mile wide at one point just before it struck Denning. 40/29 News reporter Kelly Johnson said there was lots of structural damage in the Denning...