From the NOAA Satellite and Information Service.
Click on the chart for the entire story.
The period through the end of May, 2011 was marked by numerous large severe weather outbreaks, causing a record-breaking tornado year for the year-to-date period. Approximately 1,400 preliminary tornado reports were received by the National Weather Service during the January–May period, and 875 of those tornado reports were during the month of April alone.
Terrible and beautiful at the same time.