(CNN)Here's some background information about tornadoes, rotating columns of air that often, but not always, are visible as funnel clouds. According to the National Weather Service, in 2023 there were 83 tornado-related deaths in the United States.
Facts
Most tornadoes form from severe thunderstorms. Hurricanes can also produce tornadoes.
Tornado winds may exceed 300 miles (483 kilometers) per hour.
Photos: Major storms of the past 10 years
Photos: Major storms of the past 10 years
Major storms of the past 10 years – Super Typhoon Haiyan, one of the strongest storms ever recorded, made landfall in the Philippines on Friday, November 8. The storm had maximum sustained winds of 315 kph (195 mph) and gusts as strong as 380 kph (235 mph), officials said. That wind strength puts it well above the 252 kph (157 mph) threshold for a Category 5 hurricane, the highest category on the Saffir-Simpson hurricane wind scale.
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Photos: Major storms of the past 10 years
Major storms of the past 10 years – Hurricane Sandy, a Category 2 storm, formed on October 22, 2012, and dissipated on October 29. The hurricane's path went through Haiti, Jamaica, Cuba and the coastlines of New Jersey and New York. It caused $50 billion in preliminary damages and at least 165 deaths.
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Photos: Major storms of the past 10 years
Major storms of the past 10 years – Hurricane Isaac, a Category 1 storm, formed on August 21, 2012, and dissipated on September 1. Its path included Haiti, Cuba, southern Mississippi and southeastern Louisiana. It caused $2.35 billion in estimated damages and at least 41 deaths.
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Photos: Major storms of the past 10 years
Major storms of the past 10 years – Hurricane Ernesto, a Category 1 storm, formed on August 2, 2012, and weakened on August 8. The hurricane made landfall in the Mexican state of Quintana Roo, on the Yucatan Peninsula. It caused $174 million in damages and seven deaths.
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Photos: Major storms of the past 10 years
Major storms of the past 10 years – Hurricane Irene, a Category 1 storm, formed on August 20, 2011, and dissipated on August 29. The hurricane, which made landfall in eastern North Carolina, caused $7.3 billion in damages and at least 45 fatalities.
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Photos: Major storms of the past 10 years
Major storms of the past 10 years – Super Typhoon Megi made landfall over the northern Philippines island of Luzon on October 18, 2010. It was one of the most intense tropical cyclones on record. It had maximum sustained winds of 167 mph. An estimated $400 million in damages was reported, along with 11 deaths.
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Photos: Major storms of the past 10 years
Major storms of the past 10 years – Hurricane Ike, a Category 2 storm, formed on September 1, 2008, and dissipated on September 14. The hurricane's path included the Turks and Caicos Islands, Cuba, Texas, Louisiana and Arkansas. It caused $29.5 billion in damages and 155 deaths.
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Photos: Major storms of the past 10 years
Major storms of the past 10 years – Hurricane Wilma, a Category 3 storm, formed on October 15, 2005, and dissipated on October 25. The storm, which made landfall near Marco Island, Florida, caused $21 billion in damages and at least 45 fatalities.
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Photos: Major storms of the past 10 years
Major storms of the past 10 years – Hurricane Rita, a Category 3 storm, formed on September 20, 2005, and dissipated on September 24. It made its landfall in Louisiana, and it caused 54 fatalities and $12 billion in damages.
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Photos: Major storms of the past 10 years
Major storms of the past 10 years – Hurricane Katrina, a Category 3 storm, formed on August 25, 2005 and dissipated on August 29. The hurricane hit Florida as a Category 1 and then Louisiana as a Category 3. Its path also included Alabama and Mississippi. It caused $108 billion in damages and more than 1,723 deaths.
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Photos: Major storms of the past 10 years
Major storms of the past 10 years – Hurricane Dennis, a Category 4 storm, formed on June 29, 2005, and dissipated on July 13. The hurricane made landfall near Punta del Ingles in southeastern Cuba. It was responsible for at least 42 deaths as well as $2.23 billion in damages.
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Photos: Major storms of the past 10 years
Major storms of the past 10 years – Hurricane Jeanne, a Category 3 storm, formed on September 13, 2004, and dissipated on September 28. It made landfall on the east coast of Florida and is responsible for an estimated $6.88 billion in damages and 3,000 deaths in Haiti.
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Photos: Major storms of the past 10 years
Major storms of the past 10 years – Hurricane Ivan, a Category 5 storm, formed on September 2, 2004, and dissipated on September 24. Affected areas included Grenada, Jamaica, the Grand Cayman Islands, Cuba, the Dominican Republic, Venezuela, Tobago and Barbados. The hurricane caused more than $18.8 billion in damages and 25 deaths.
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Tornadoes can lift cars, mobile homes and animals into the air.
Tornadoes are sometimes called "twisters."
Are tornadoes getting stronger? 01:44
On average, tornadoes travel at around 10-20 miles per hour.
The average tornado is on the ground about five minutes.
The most destructive and deadly tornadoes occur from supercells, which are rotating thunderstorms with a well-defined radar circulation called a mesocyclone. Supercells can also produce damaging hail, severe non-tornadic winds, unusually frequent lightning, and flash floods.
The United States has the highest number of tornado occurrences in the world with an average of more than 1,000 tornadoes reported each year.
A disproportionately high frequency of tornadoes occurs in Florida and a region called "Tornado Alley," which spans across the central southern plans.
Tornadoes usually occur during the spring and early summer, most often in the late afternoon and early evening.
A tornado watch is issued by the National Weather Service when atmospheric conditions promote the forming of tornadoes.
A tornado warning is issued when Doppler radar detects a mesocyclone in a thunderstorm or when a funnel cloud has been spotted.
A tornado emergency is enhanced wording in a tornado warning indicating a large tornado is moving into a heavily populated area. A severe threat to human life and catastrophic damage from a tornado is imminent or ongoing. The term was coined by forecasters in May 1999 and is used sparingly.
Enhanced Fujita Scale
The Enhanced Fujita scale became operational on February 1, 2007. It is used to assign a tornado a rating based on estimated wind speed and damage the tornado causes.
EF0 is the weakest point on the Enhanced Fujita Scale and EF5 is the strongest.
Timeline
March 18, 1925 - The deadliest US tornado in modern history hits the tri-state area of Missouri, Illinois and Indiana, killing 695 people. It is the longest-lived and has the longest path of any recorded US tornado.
1950 - The United States begins keeping official records about tornadoes.
February 2, 2007 - At least 20 people are killed in Lake and Volusia counties in Florida after at least three tornadoes touch down in the middle of the night.
March 1, 2007 - At least 20 people are killed, one in Missouri, 10 in Alabama, and nine in Georgia from a string of tornadoes. In Alabama, eight of the 10 killed are teenagers from Enterprise High School in Enterprise, Alabama.
February 5-6, 2008 - At least 57 people are killed, 31 in Tennessee, 14 in Arkansas, seven in Kentucky and five in Alabama from a string of tornadoes.
March 14, 2008 - A tornado reaching EF2 strength hits downtown Atlanta, damaging the Georgia World Congress Center, CNN Center, the Georgia Dome and many other buildings. One person is killed in a building collapse.
May 9-11, 2008 - A series of tornadoes kills 22 in three states including six in Ottawa County, Oklahoma; 13 in Newton County, Missouri; one in Jasper County, Missouri; one in an area of Purdy in Barry County, Missouri, and one in Laurens County, Georgia.
April 14-16, 2011 - At least 114 tornadoes touch down in Oklahoma, Kansas, Louisiana, Mississippi, Alabama, Missouri, Illinois, Georgia, South Carolina, North Carolina, Virginia, Maryland, Arkansas and Pennsylvania. Of the 46 fatalities reported, 23 occur in North Carolina.
April 25-28, 2011 - A record-setting outbreak of 362 confirmed tornadoes occurs. There are approximately 321 fatalities in six states during the entire outbreak. The majority of fatalities occur in Alabama, where as many as 249 people are killed. Other states reporting fatalities are Mississippi, Tennessee, Georgia, Virginia and Arkansas.
May 22, 2011 - An EF5 tornado strikes Joplin, Missouri, killing at least 158 people. It is the deadliest single US tornado since federal record-keeping began in 1950. The tri-state tornado of 1925 is still the deadliest tornado in modern US history.
May 24, 2011 - Tornadoes strike Arkansas, Oklahoma and Kansas, killing at least 18 people.
2011 - NOAA reports that 751 tornadoes touched down across the United States in April 2011, breaking the previous monthly record of 542 tornadoes in May 2003.
May 20, 2013 - An EF5 tornado hits Moore, Oklahoma. The path of the tornado is 17 miles long. Twenty-four people are killed.
January 20-22, 2017 - Twenty people are killed - more than in all of 2016 - during an outbreak of twisters stretching from Texas to South Carolina. More than 80 tornadoes are preliminarily reported over three days, with more than 60 reported on January 21 alone, according to NOAA.
March 3, 2019 - An outbreak of tornadoes touches down in Alabama, Georgia, Florida and South Carolina. In Lee County, Alabama, an EF4 tornado kills 23 people, making it the deadliest day for tornadoes in Alabama since the Tuscaloosa-Birmingham tornado that killed more than 200 people in 2011.
March 24, 2023 - At least 26 people are killed after tornadoes touch down in Mississippi and Alabama. In Sharkey County, Mississippi, an EF4 tornado flattens much of the community of Rolling Fork.
Top 10 Deadliest Single US Tornadoes
(Source: NOAA/NWS Storm Prediction Center)
March 18, 1925 - Tri-state area of Missouri, Illinois and Indiana - 695 fatalities.
May 6, 1840 - Natchez, Mississippi - 317 fatalities.
May 27, 1896 - St. Louis, Missouri - 255 fatalities.
April 5, 1936 - Tupelo, Mississippi - 216 fatalities.
April 6, 1936 - Gainesville, Georgia - 203 fatalities.
April 9, 1947 - Woodward, Oklahoma - 181 fatalities.
May 22, 2011 - Joplin, Missouri - 158 fatalities.
April 24, 1908 - Amite, Louisiana and Purvis, Mississippi - 143 fatalities.
June 12, 1899 - New Richmond, Wisconsin - 117 fatalities.
June 8, 1953 - Flint, Michigan - 116 fatalities.
Top 10 Costliest Tornadoes since 1950 (in 2023 dollars)
(Source: NOAA/NWS Storm Prediction Center)
May 22, 2011 - Joplin, Missouri - $2.8 billion (actual cost) - $3.78 billion (adjusted for inflation)
April 27, 2011 - Tuscaloosa, Alabama - $2.45 billion (actual cost) - $3.33 billion (adjusted for inflation)
May 20, 2013 - Moore, Oklahoma - $2 billion (actual cost) - $2.62 billion (adjusted for inflation)
June 8, 1966 - Topeka, Kansas - $250 million (actual cost) - $2.35 billion (adjusted for inflation)
May 11, 1970 - Lubbock, Texas - $250 million (actual cost) - $1.97 billion (adjusted for inflation)
October 20, 2019 - North Dallas, Texas - $1.55 billion (actual cost) - $1.84 billion (adjusted for inflation)
May 3, 1999 - Moore/Oklahoma City, Oklahoma - $1 billion (actual cost) - $1.83 billion (adjusted for inflation)
March 3, 2020 - Nashville, Tennessee - $1.5 billion (actual cost) - $1.78 billion (adjusted for inflation)
April 27, 2011 - Hackleburg, Alabama - $1.29 billion (actual cost) - $1.75 billion (adjusted for inflation)
April 3, 1974 - Xenia, Ohio - $250 million (actual cost) - $1.59 billion (adjusted for inflation)
Photos: Photos: 10 deadliest U.S. tornadoes
10 deadliest U.S. tornadoes – 1.The "Tri-State Tornado," which killed 695 people and injured 2,027, was the deadliest tornado in U.S. history, according to the National Oceanic and Atmospheric Administration. The tornado traveled more than 300 miles through Missouri, Illinois and Indiana on March 18, 1925, and was rated an F5, the most powerful under old Fujita scale (winds of 260-plus mph).
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Photos: Photos: 10 deadliest U.S. tornadoes
10 deadliest U.S. tornadoes – 2. The "Natchez Tornado" killed 317 people and injured 109 on May 6, 1840, along the Mississippi River in Louisiana and Mississippi. The official death toll may not have included slaves, according to the Federal Emergency Management Agency.
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Photos: Photos: 10 deadliest U.S. tornadoes
10 deadliest U.S. tornadoes – 3. The "St. Louis Tornado" killed 255 people and injured 1,000 on May 27, 1896, in Missouri and Illinois. It had winds of between 207 mph and 260 mph.
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Photos: Photos: 10 deadliest U.S. tornadoes
10 deadliest U.S. tornadoes – 4. The "Tupelo Tornado" killed 216 people and injured 700 on April 5, 1936, in the northeastern Mississippi city.
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Photos: Photos: 10 deadliest U.S. tornadoes
10 deadliest U.S. tornadoes – 5. The "Gainesville Tornado" was a pair of storms that converged April 6, 1936, in Gainesville, Georgia, killing 203 people and injuring 1,600. The tornado destroyed four blocks and 750 houses in the northern Georgia town.
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Photos: Photos: 10 deadliest U.S. tornadoes
10 deadliest U.S. tornadoes – 6. The "Woodward Tornado" wreaked havoc across parts of Texas, Oklahoma and Kansas on April 9, 1947 killing 181 people and injuring 970. The funnel cloud reportedly was more than a mile wide in places.
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Photos: Photos: 10 deadliest U.S. tornadoes
10 deadliest U.S. tornadoes – 7. The tornado that struck Joplin, Missouri, on May 22, 2011, killed 158 people and injured more than 1,000. The storm packed winds in excess of 200 mph and was on the ground for more than 22 miles.
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Photos: Photos: 10 deadliest U.S. tornadoes
10 deadliest U.S. tornadoes – 8. The "Amite/Pine/Purvis Tornado" killed 143 people and injured 770 on April 24, 1908. The storm left only seven houses intact in Purvis, Mississippi, and also caused damage in Amite, Louisiana.
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Photos: Photos: 10 deadliest U.S. tornadoes
10 deadliest U.S. tornadoes – 9. The "New Richmond Tornado" killed 117 people and injured 200 on June 12, 1899, in New Richmond, Wisconsin.
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Photos: Photos: 10 deadliest U.S. tornadoes
10 deadliest U.S. tornadoes – 10. The "Flint Tornado" killed 115 people and injured 844 on June 8, 1953, in Flint, Michigan. The tornado was the deadliest twister ever recorded in the state.
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