http://www.noaanews.noaa.gov/april_2011_tornado_information.htmlNOAA's preliminary estimate is that there were 288 tornadoes during the entire outbreak from 8:00 a.m. EDT April 26 to 8:00 a.m. April 28, 2011. During the 24-hour period from 8:00 a.m. EDT April 27 to 8:00 a.m. EDT April 28, The National Weather Service (NWS) estimates there were a total of 211 tornadoes.
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Expert NOAA analysis of the fatality information indicates that 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. There were 334 fatalities during the 24-hour-period from 8:00 a.m. April 27 to 8:00 a.m. April 28.
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NWS’s preliminary estimate is that there have been more than 600 tornadoes thus far during the month of April 2011.
The previous record number of tornadoes during the month of April was 267 tornadoes set in April 1974. The previous record number of tornadoes during any month was 542 tornadoes set in May 2003.
The average number of tornadoes for the month of April during the past decade is 161.
The overall monthly average number of tornadoes for the past decade is 106....(more@lini)
Bright reds, oranges and yellows show tracks of where rotation was strongest as detected by NWS Doppler radars during the April 27, 2011 tornado outbreak.