In a statement released today (April 19th) at 9:20am, the National Weather Service says their evaluation revealed the tornado in Delaware Co contained winds of 115-125mph ranking it an EF2 on the Enhanced Fujita Scale.
Began: 4 E Zena, OK at 1:30 am CDT April 18, 2013
Ended: 7 SE Grove, OK at 1:40 am CDT April 18, 2013
Path Length: 8 miles
Max Path Width: 800 yards
EF Rating: EF-2 with maximum wind speeds of 115-125 mph
Survey Summary: This tornado developed along the leading edge of the bow echo. It formed just east of Highway 59, south of Highway 127. The most intense stage of this tornado’s lifecycle was early on as it produced an 800 yard wide corridor of impressive tree damage when it crossed the 638 Road and severely damaged a permanent home. Numerous tress were snapped and uprooted, power poles were blown down, homes were damaged, and barns were destroyed as the tornado moved northeast. It dissipated about 2 miles west of the Missouri state line, north of East 324 Road.