April 4 (Bangladesh) During the afternoon of April 4, a powerful tornado struck seven districts in northern Bangladesh. At least 12 people were killed and more than 150 injured as the tornado destroyed hundreds of homes and uprooted large swaths of vegetation.
April 4–5 (United States) Several storms started to develop in the evening on April 3. Storms in Kansas, Missouri, Iowa and Illinois brought severe thunderstorms to the areas. A tornado watch was issued for Iowa and Illinois as the storms rolled through, and later a severe thunderstorm watch for northeastern Illinois and southeastern Wisconsin. However, there were no reported tornadoes. Continuing eastward, the system entered an environment favoring tornadic development. Two tornadoes were reported in Kentucky during the early afternoon, both rated EF2 and resulting in injuries. Near
Hopkinsville, a tornado, confirmed by local emergency services, caused significant damage to a manufacturing plant. Numerous buildings were reported to be destroyed, trapping residents within debris. In addition to the tornadoes, there was widespread wind damage (over 1,400 severe weather reports were received by the
Storm Prediction Center, with the vast majority being damaging winds) as an extremely large
squall line/serial
derecho tracked across the southern United States with wind gusts as high as 90 mph (145 km/h) reported across 20 states,
April 8–11 (United States) A large storm system with an associated frontal boundary moved northward and eastward across the central United States beginning on April 8. While initial severe weather was limited, a lone
supercell broke out ahead of a
mesoscale convective system in
Pulaski County, Virginia on the eastern end of the warm front that evening. Two tornadoes were confirmed, one of which was rated EF2 and caused severe damage in
Pulaski, Virginia. Numerous houses were damaged and eight people were injured. During the afternoon of April 9, supercells developed along the warm front and tracked through parts of
Kentucky,
Tennessee,
Virginia, and
North Carolina, generating softball sized hail and eight more tornadoes. During the evening of April 9, several severe thunderstorms developed across Nebraska, South Dakota and Iowa. A single supercell became tornadic over extreme western Iowa, producing a family of ten tornadoes over the course of five hours, the most powerful of which was an EF4
satellite tornado that completely leveled a farmstead in western
Pocahontas County, Iowa. destroying about 100 homes. Due to a 20-minute warning time, no fatalities took place and only 14 people were injured. Officials blocked off the town and
Governor Terry Branstad issued a disaster proclamation for the town. Additional tornadic activity developed on April 10 across
Wisconsin with several more tornadoes reported there.
April 14–16 (United States) During the afternoon of April 14, a significant tornado outbreak started setting up. A PDS (
Particularly Dangerous Situation) tornado watch was issued for much of eastern
Oklahoma. Supercells explosively developed over central Oklahoma. Storm chasers in the region reported several funnel clouds and two tornadoes, neither of which resulted in damage. Several tornadoes were confirmed through storm chaser video and local emergency management services. A large, intense, multiple-vortex tornado caused severe damage in the towns of
Atoka and
Tushka where many houses were destroyed or flattened. Numerous injuries were reported in the latter of these areas. Two people were killed and 25 more injured in Tushka. In
Arkansas, 2 people were killed when an EF1 downed a tree which landed on a house. During the late-night hours into the morning of April 15, tornadic activity lessened. However, by the late morning hours, supercell thunderstorms developed again over parts of
Mississippi, and tornadoes began to develop again. A
tornado emergency was declared for the northern
Jackson metropolitan area as a result at shortly after 11:00 am CDT (1600 UTC). A destructive tornado moved across the area with severe damage and multiple injuries according to
WLBT coverage. That afternoon,
Mississippi State University spotters confirmed a large tornado in east-central Mississippi and west-central
Alabama and another tornado emergency was issued.
ABC 33/40 coverage reported that the tornado was 3/4 mile (1.2 km) in width. Over 90 tornado sightings were reported that day and at least eight people were killed in Mississippi and Alabama. On April 16, another PDS tornado watch, along with a "high risk" alert from the SPC were issued for central and eastern North Carolina. At least 24 died and 135 were seriously injured in what became North Carolina's worst tornado outbreak in 25 years; tornadoes also struck
South Carolina,
Virginia,
Maryland and
Pennsylvania. Twelve of the North Carolina deaths took place in
Bertie County; tornado emergencies were issued for
Raleigh,
Snow Hill, and
Wilson at the height of the outbreak. In North Carolina, twelve supercells produced at least 25 tornadoes, with at least 32 counties affected. A total of 21 businesses and 440 homes were destroyed, 63 of those homes in
Raleigh; about 92 businesses and 6,189 homes suffered significant damage, 184 of those homes in Raleigh.
April 19–24 (United States) Yet another severe weather event developed across the
Midwest and southern
Great Plains on April 19 as another dynamic low pressure system tracked across the area. Thunderstorms began in the late afternoon and early evening with large hail and several tornadoes. Significant damage was reported near
Bowling Green, Missouri and
Girard, Illinois as a result of tornadoes, the latter of which was rated EF3. Another large tornado was reported near
Octavia, Oklahoma before the supercells merged into a very large
squall line. Overnight, the squall line tracked eastward with widespread wind damage and many embedded tornadoes across several states, a few as strong as EF2, but most were brief and weak. In the early hours of April 20, 2011, a tornado tore through a neighborhood in
Oregon, Ohio, leaving some significant damage but no injuries. Also, three tornadoes struck
New Albany, Indiana, and
Jeffersonville, Indiana. Both are cities just north of
Louisville, Kentucky Severe weather once again developed across parts of the
Midwest on April 22. The hardest-hit area was parts of the
St. Louis metropolitan area. A destructive tornado tracked across the region with severe damage in several communities including houses destroyed in communities such as
Bridgeton,
Ferguson,
Florissant,
Hazelwood,
Maryland Heights and
New Melle.
Lambert-St. Louis International Airport was hard hit with severe damage to numerous facilities there and injuries reported. Windows were blown out of the terminals there and airplanes were flipped in the field. Concourse C was the hardest hit, taking nearly a year to reopen; it reopened on April 2, 2012. The tornado was given a rating of EF4 based on finding of flattened houses in Bridgeton. Following assessments by the local National Weather Service, it was determined that a single tornado tracked for through parts of Missouri and Illinois, reaching a maximum width of . Elsewhere, there were several reported tornadoes, including an EF2 tornado which tracked through
Henderson,
Webster and
Union County. A few more tornadoes were reported on April 23–24; however, most did not cause any severe damage, though one EF2 tornado caused structural damage in the town of
Bardwell, Kentucky.
April 25–28 (United States and Canada) shortly after causing devastating damage on April 27. Between April 25 and 28, a historic and devastating tornado outbreak took place across much of the Southern United States as well as parts of the
Midwest and
Northeast. With 367 confirmed tornadoes and 324 tornadic fatalities, the outbreak ranks as the largest and one of the worst in United States history. More than three dozen tornadoes were confirmed each day of the event, with 42 on April 25, 55 on April 26, a 24-hour record of 223 on April 27, and 47 on April 28. In terms of violent tornadoes, the event ranks third with 15 EF4/5 rated tornadoes, behind the
1974 Super Outbreak and
1965 Palm Sunday outbreak. A large outbreak was possible for April 25–27 as the SPC issued a moderate risk of severe weather for three consecutive days, centered over
Arkansas through
Tennessee. By the late-afternoon hours of April 25, several tornadoes had been reported across a few states, including two which caused significant damage in
Oklahoma and Texas. At 3:25 pm CST (2025 UTC), the SPC issued a
PDS tornado watch for much of Arkansas and parts of
Missouri, Oklahoma, Texas and
Louisiana. Tornadoes were scattered that day until early evening, when an intense tornadic cell tracked near the
Little Rock metropolitan area and a
tornado emergency was declared for
Vilonia, Arkansas. A wide EF2 tornado then caused extensive damage in Vilonia. At least four people are known to have died in the town with many more injured. . On April 27, a large and destructive EF4 tornado struck
Tuscaloosa, Alabama, killing 44 people. The Tuscaloosa mayor called the damage "catastrophic." The same tornado hit the northern suburbs of
Birmingham, Alabama, shortly thereafter, killing 20 more people. Television reporters in Birmingham, filming the tornado, reported that even from miles away, the funnel was so wide that they could not
zoom their cameras out far enough to get the entire funnel into the frame at once. Over 200 tornadoes were reported during the SPC's reporting day of 1200
Z April 27 (7:00 am
CDT) to 1200Z April 28 (7:00 am CDT). 324 tornadic deaths were confirmed as a result of the outbreak, with as many as 238 in Alabama alone. The overall death toll also includes 32 deaths in Tennessee, 31 in Mississippi, 14 in Georgia, 5 in Arkansas, and 4 in Virginia, according to state officials. On April 27,
President Barack Obama approved
Governor Robert Bentley's request for emergency federal assistance including search and rescue support. On April 28, 2011, the
National Weather Service sent out people to survey the damage; however, with the large number of tornadoes across Alabama, the reports were not finalized for months. By April 30, the death toll from the event (including death tolls from flooding and other severe weather) stood at more than 340 people across six states. On a lesser note, an F0 tornado (the
Fujita scale was still used in
Canada) downed trees and ripped siding off store buildings in
Fergus, Ontario on April 27. ==May==