NOAA April 2011 tornado information: “NWS’s preliminary estimate is that there have been more than 600 tornadoes…during the month of April 2011…NOAA’s preliminary estimate is that there were 312 tornadoes during the entire outbreak from 8:00 a.m. EDT April 26 to 8:00 a.m. April 28, 2011…The largest previous number of tornadoes on record in one event occurred from April 3-4, 1974, with 148 tornadoes…at least 344 people were killed during the entire outbreak from 8:00 a.m. EDT April 26 to 8:00 a.m. April 28…These are the most fatalities from a single tornado in the United States since May 25, 1955, when 80 people were killed in a tornado in southern Kansas with 75 of those deaths in Udall, Kansas.”