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."