sentences:  After few other significant events in the rest of January, a deadly period took place in the latter part of the winter.Two deadly outbreaks and several other major tornado events marred February and March, especially in the southern US.The spring was also fairly active, with several significant tornado events in April and May, including a major outbreak in the first weekend of May producing the first ever EF5 tornado (and first F5 tornado on any scale in the 21st century).