Jan. 29 - Feb. 3: 'Groundhog Day Blizzard' – A massive winter storm dubbed the "Groundhog Day Blizzard" struck several states across the southeast, central and northeast United States, paralyzing travelers, knocking out electricity and killing 36 people. Total losses approached $2 billion.
April 4-5: Tornadoes in Midwest, Southeast – During the first week of April, 46 tornadoes struck 10 central and Southern states, causing nine deaths and nearly $3 billion in damage. The twisters tore the roof off this manufacturing plant near Hopkinsville, Kentucky. The region saw more damaging tornadoes in the weeks that followed.
April 8-11: More tornadoes strike the U.S. – An estimated 59 tornadoes pummeled nine states in the central and southeastern United States, damaging more than 60% of the small town of Mapleton, Iowa, pictured here. There were no deaths, but this twister outbreak caused more than $2.2 billion in damage.
April 14-16: A third week of twisters – The cycle of deadly tornadoes continued in mid-April when an outbreak of 177 tornadoes struck 10 central and Southern states, killing 38 people. The power of the twisters bent over this tree in Camp Lejeune, North Carolina. Total property losses exceeded $2 billion.
April 25 - 28: Tornado 'super-outbreak' – In the last five days of April, a "superoutbreak" of more than 340 tornadoes hit the central and Southern states, killing 321 people -- most of them in Alabama. One mile-wide twister tore through Tuscaloosa, Alabama, pictured here, devastating the city. Total losses exceeded $10 billion.
May 22-27: Another tornado outbreak – On May 22, an extremely powerful tornado struck Joplin, Missouri, part of a six-day tornado outbreak of 180 twisters in more than a dozen states that caused 177 deaths, most of them in Joplin. The town is still rebuilding, as shown in this photo taken four months after the tornado -- the single deadliest twister in U.S. history. Total losses exceeded $9 billion.