The largest tornado outbreak and greatest one-day total for tornadoes in history occurred during last week's historic super tornado outbreak, said NOAA in a press release on Wednesday. They estimate 190 tornadoes touched down during the 24-hour period from 8:00 a.m. EDT April 27 to 8:00 a.m. EDT April 28 (132 tornadoes have already been confirmed, with several weeks of damage surveys still to come.) NOAA's estimate for the number of tornadoes during the three-day April 25 - 28, 2011 Super Outbreak, is 305. This is nearly double the previous record for a multi-day tornado outbreak of 155 tornadoes, set just two weeks previously during the April 14 - 16, 2011 outbreak.
There were tornado outbreaks in May 2004 (385 tornadoes) and May 2003 (401 tornadoes) that had more tornadoes, but these outbreaks occurred over an eight-day and eleven-day period, respectively, and were not due to a single storm system. Prior to April 2011, the most tornadoes in a 24-hour period, and in an outbreak lasting less than four days, was the 148 tornadoes in the Super Outbreak of April 3 - 4, 1974.
http://www.wunderground.com/blog/JeffMasters/comment.html?entrynum=1796
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