Awwal 14, 1432, April 18, 2011, SPA -- A cluster of 241 lethal tornados over three days has claimed at least 40 lives, making it the largest tornado outbreak connected to a single storm system in US history, according to a meteorologist on Sunday. Henry Margusity, senior meteorologist with the private weather forecasting service AccuWeather.com, was commenting on the deadly twisters that ravaged cities and towns from Oklahoma to North Carolina from Thursday to Saturday. "There has not been a tornado outbreak in history over three days with this many tornadoes spawned by a single storm system," Margusity was quoted as saying by the German Press Agency "DPA".