1974 Super Outbreak facts for kids

Quick facts for kids
1974 Super Outbreak

Clockwise from top: Satellite image showing the massive storm system on April 3; storm path through Guin, Alabama; aerial view of damage in Xenia, Ohio; map showing paths of confirmed tornadoes; radar view showing severe supercell storms.
Meteorological history
Duration	April 3–4, 1974
Tornado outbreak
Tornadoes	149 confirmed
Maximum rating	F5 tornado
Duration	1 day, 1 hour, 16 minutes
Highest winds	Tornadic – 305 mph (491 km/h) (Xenia, Ohio F5 on April 3)
Highest gust	Non-tornadic – 85 mph (137 km/h) in Oklahoma
Largest hail	2.5 in (6.4 cm) at Abraham Lincoln Capital Airport, Illinois on April 3
Extratropical cyclone
Lowest pressure	980 hPa (mbar); 28.94 inHg
Maximum rainfall	3 inches (7.6 cm) in multiple locations
Blizzard
Maximum snowfall or ice accretion	12 inches (30 cm) in multiple locations in Colorado
Overall effects
Fatalities	310–335 fatalities
Injuries	5,454–6,142 injuries
Damage	$600 million (1974 USD)
Areas affected	Midwest and Southern United States, Ontario, Canada
Part of the tornado outbreaks of 1974

The 1974 Super Outbreak was one of the largest and most powerful tornado outbreaks in recorded history. It took place across 24 hours between April 3 and April 4, 1974. During this event, 149 tornadoes struck 13 American states and the Canadian province of Ontario.

This storm was famous for creating strong and violent tornadoes. Scientists recorded 30 violent tornadoes rated F4 or F5 on the Fujita scale. It set records for severe weather and helped scientists understand how massive storm systems create tornadoes.

The outbreak caused severe property damage across 900 sq mi (2,331 km²) of land. The total path length of all tornadoes combined reached 2,600 mi (4,184 km). At its peak, up to 15 different tornadoes touched down on the ground at the exact same time.

In 2023, weather researcher Thomas P. Grazulis created the outbreak intensity score (OIS) to rank outbreaks. The 1974 event scored 578 points. This score made it the most intense outbreak ever recorded in modern weather history.

Understanding the Meteorology Behind the 1974 Super Outbreak

Upper-level jet stream winds powering the storm system

A low-pressure storm system developed over the central plains on April 1, 1974. As the system moved eastward toward the Mississippi River and Ohio River valleys, it gathered energy. Warm, humid air surged northward from the Gulf of Mexico and collided with colder polar air.

This boundary created an unstable atmosphere with sharp temperature differences. Rising warm air created strong updrafts, forming severe thunderstorm clouds called supercells. Supercells are rotating thunderstorms that can produce powerful winds, hail, and tornadoes.

Forecasters at the National Weather Service anticipated severe storms for April 3. However, the true scale and intensity of the outbreak surpassed original expectations. Earlier on April 1 and 2, several strong tornadoes had touched down across parts of Kentucky, Tennessee, and Alabama.

On the morning of April 3, meteorologists issued severe weather alerts across the Midwestern United States. While southern states prepared for severe thunderstorms, northern areas near the Great Lakes and Canada experienced snow and freezing rain.

The Weather Setup on the Morning of April 3

Surface weather analysis on the morning of April 3

By early morning on April 3, a large upper-level atmospheric trough moved across North America. This trough brought very strong winds high up in the atmosphere, known as the jet stream. Atmospheric pressure dropped quickly over Kansas, reaching 980 mb (28.94 inHg).

Strong winds at lower altitudes pushed warm, moist tropical air over Louisiana, Mississippi, and Alabama. This warm air fueled convective available potential energy, known simply as CAPE. High CAPE values mean air can rise quickly to build towering clouds.

A layer of warm air higher up initially kept thunderstorms from developing too early in the morning. This stable layer acted like a lid on a boiling pot of water, allowing energy to build beneath it.

By mid-afternoon, daytime heating broke this lid, releasing enormous energy. CAPE values climbed past 2,500 J/kg across the lower Ohio Valley and Mississippi Valley. Fast-moving lines of storms formed and began racing northeastward at speeds exceeding 60 mph (97 km/h).

Afternoon Supercell Development

In the early afternoon, three distinct lines of storms organized across the eastern United States. Strong wind shear caused the air within these storms to rotate rapidly. Wind shear occurs when wind changes speed and direction at different heights.

The southern part of the first storm line produced a tornado near Cleveland, Tennessee. Meanwhile, a second line developed over eastern Illinois and southern Indiana. These rotating storms produced several violent tornadoes, including F5 tornadoes in Depauw, Indiana; Xenia, Ohio; and Brandenburg, Kentucky.

A third line of thunderstorms formed near St. Louis, Missouri. The jet stream high overhead provided extra lift, helping the storm clouds grow taller and stronger. Large hail, some the size of baseballs, fell in parts of Illinois and Missouri.

As these storms moved east, they entered areas with warmer, moister air. This air allowed tornadoes to stay on the ground for long distances. One continuous tornado path stretched across Indiana for 121 miles (195 km).

Continued Severe Weather into the Night

As evening arrived, storm activity shifted further south into Alabama and Tennessee. Wind shear remained powerful, allowing supercells to maintain their strength for several hours without weakening.

These nighttime storms spawned massive tornadoes across the region. A long-track F4 tornado carved a path through central Alabama for over 110 miles (180 km). Two separate violent tornadoes struck the community of Tanner, Alabama, within thirty minutes of each other.

Another powerful tornado struck the town of Guin, Alabama, causing major damage. Multiple tornadoes also touched down across Tennessee, continuing the outbreak late into the night.

Storm Activity on April 4

Surface weather analysis on the morning of April 4

On the morning of April 4, the storm system moved toward the Appalachian Mountains and the East Coast. Rain and strong winds spread into Virginia, West Virginia, and North Carolina. The final tornadoes of the outbreak occurred in the southeastern states during the early morning hours.

In northern regions like Michigan and Ontario, cooler air produced heavy snowfall, freezing rain, and localized flooding. After the outbreak ended, scientists studied the storm tracks to learn how the event occurred.

Meteorologist Dr. Tetsuya T. Fujita studied the damage patterns in detail. He discovered that three-fourths of all the tornadoes belonged to 30 distinct tornado families. A tornado family occurs when a single rotating supercell produces multiple tornadoes one after another.

Summary of Confirmed Tornadoes

A commemorative map prepared by the Storm Prediction Center

The 1974 Super Outbreak produced an unprecedented number of violent tornadoes. Out of the 149 confirmed tornadoes, 23 were rated F4 and 7 were rated F5. This remains one of the highest concentrations of violent tornadoes ever observed in a single weather system.

The continuous outbreak lasted for approximately 18 hours across various regions. The longest individual tornado path occurred in Indiana near Monticello, tracking for 121 miles (195 km).

Tornadoes occurred in many types of terrain, including flat farmland, hills, and river valleys. This helped disprove old myths that tornadoes could not cross rivers or travel over steep hills.

Seven tornadoes reached F5 intensity during the outbreak:

• Depauw–Martinsburg, Indiana
• Xenia, Ohio
• Brandenburg, Kentucky
• Rising Sun, Indiana / Sayler Park, Ohio
• Tanner, Alabama (First Tornado)
• Tanner, Alabama (Second Tornado)
• Guin, Alabama

Notable Violent Tornadoes of the Outbreak

Depauw–Martinsburg–Daisy Hill, Indiana

Depauw–Martinsburg–Daisy Hill, Indiana

The wide tornado passing near Depauw, Indiana
Meteorological history
Duration	1 hour and 9 minutes
Formed	April 3, 1974, 2:16 p.m. CDT
Dissipated	April 3, 1974, 3:25 p.m. CDT
F5 tornado
on the Fujita scale
Overall effects
Casualties	6 fatalities, 76 injuries

Damage to buildings near Depauw, Indiana

This tornado was the first of seven F5 tornadoes to touch down during the outbreak. It formed at 2:16 p.m. CDT south of Huffman, Indiana. It moved quickly northeast across southern Indiana for 62 miles (100 km).

As it traveled through Crawford County, the tornado widened to over 1 mi (1.6 km). It caused severe damage to farms and rural homes. In the town of Martinsburg, Indiana, 38 out of 48 homes were completely destroyed.

The tornado then struck Daisy Hill, sweeping away several well-built houses before dissipating near New Liberty. Six people lost their lives and 76 were injured along its path.

Decatur, Illinois

Decatur, Illinois

Aerial view of damage to neighborhoods in Decatur
Meteorological history
Duration	20 minutes
Formed	April 3, 1974, 2:30 p.m. CDT
Dissipated	April 3, 1974, 2:50 p.m. CDT
F3 tornado
on the Fujita scale
Overall effects
Casualties	1 fatality, ≥26 injuries
Damage	$3.2 million (1974 USD)

At 2:30 p.m. CDT, a strong tornado touched down near the Sangamon River in Illinois. It quickly grew into an F3 tornado as it moved northeast toward the city of Decatur, Illinois.

The storm damaged several residential areas and open farmland. At the Macon County Fairgrounds, it damaged exhibition buildings and barns, causing significant property loss.

In total, 55 homes were destroyed and 106 were damaged in Decatur. One person died and 26 others were injured. Over 2,000 local volunteers helped clean up debris and rebuild community facilities following the storm.

Parker City Tornado Family, Indiana

The Parker City Tornado Family

Tornado near Knightstown, Indiana, before moving toward Kennard
Meteorological history
Formed	2:50 p.m. – 3:58 p.m. April 3
Overall effects
Fatalities	2
Injuries	54
Damage	>$10 million (1974 USD)
Areas affected	Indiana
Tornado family
Tornadoes	3 confirmed
Maximum rating	F4 tornado
Duration	1 hour, 8 minutes
Highest gust	284 mph

This group of three tornadoes formed in east-central Indiana from a single supercell. As the first tornado weakened, a new one formed nearby in a repeating cycle.

The first tornado touched down near Fairland at 2:50 p.m. CDT, causing F3 damage. The second tornado reached F4 strength, striking Kennard, Indiana, where 70 percent of the town was damaged or destroyed.

The third tornado reached F4 intensity near Parker City, Indiana. It passed directly through Monroe Central Junior-Senior High School. Fortunately, students had been dismissed 20 minutes earlier, preventing major injuries.

Hanover–Madison, Indiana

Hanover-Madison, Indiana

Tornado approaching Hanover, Indiana
Meteorological history
Duration	47 minutes
Formed	April 3, 1974, 3:19 p.m. CDT
Dissipated	April 3, 1974, 4:06 p.m. CDT
F4 tornado
on the Fujita scale
Overall effects
Casualties	11 fatalities, 190 injuries
Damage	$35 million (1974 USD)

Shortly after the Depauw tornado ended, the same parent storm produced another violent tornado near Henryville, Indiana. This tornado grew to nearly a mile wide as it approached Hanover, Indiana.

The campus of Hanover College was heavily damaged, with building repair costs exceeding $10 million. In a nearby residential area, 71 out of 75 homes were leveled.

The tornado continued into Madison, Indiana, destroying approximately 300 homes and damaging the Clifty Creek Power Plant. Across its track, the tornado caused 11 deaths and 190 injuries.

Hardinsburg–Irvington–Brandenburg, Kentucky

Hardinsburg–Irvington–Brandenburg, Kentucky

Aerial view of Brandenburg, Kentucky, after the tornado
Meteorological history
Duration	52 minutes
Formed	April 3, 3:30 p.m. CDT
Dissipated	April 3, 4:22 p.m. CDT
F5 tornado
on the Fujita scale
Overall effects
Casualties	31 fatalities, 257 injuries
Damage	$2.5 million

Remains of a destroyed home in Brandenburg

This F5 tornado touched down at 3:30 p.m. CDT in Breckinridge County, Kentucky. It followed a 34-mile (55 km) path northeast toward the Ohio River.

The tornado caused F4 damage near Irvington before reaching its maximum F5 strength in Brandenburg, Kentucky. It leveled numerous buildings throughout the town, completely destroying the downtown district.

The storm claimed 31 lives and injured 257 people in Brandenburg. It crossed the Ohio River into Indiana, producing F4 damage before lifting. It remains the only officially recorded F5 tornado in Kentucky history.

Bellbrook–Xenia–Wilberforce, Ohio

Bellbrook-Xenia-Wilberforce, Ohio

The large Xenia tornado moving through residential neighborhoods
Meteorological history
Duration	39 minutes
Formed	April 3, 4:33 p.m. EDT
Dissipated	April 3, 5:12 p.m. EDT
F5 tornado
on the Fujita scale
Highest winds	305 mph (491 km/h)
Overall effects
Casualties	34 fatalities, 1,150 injuries
Damage	$100 million (1974 USD)

The tornado that struck Xenia, Ohio, was the deadliest individual tornado of the entire outbreak. It began near Bellbrook at 4:33 p.m. EDT and intensified as it moved rapidly northeast.

The tornado reached F5 strength with winds estimated near 305 mph (491 km/h). It flattened entire neighborhoods in western Xenia, including Windsor Park and Arrowhead subdivisions.

In the center of town, schools, businesses, and churches were heavily damaged. Students practicing a play at Xenia High School safely took cover in a hallway seconds before the building was struck.

The tornado moved through Wilberforce, Ohio, damaging parts of Wilberforce University and Central State University. In total, 32 people died during the storm and two emergency responders died during cleanup efforts, bringing the total memorial count to 34.

Rising Sun, Indiana to Sayler Park (Cincinnati), Ohio

Tri-State (Indiana, Kentucky, Ohio)

The tornado approaching Sayler Park in Cincinnati
Meteorological history
Duration	23 minutes
Formed	April 3, 1974, 4:28 p.m. CDT
Dissipated	April 3, 1974, 4:51 p.m. CDT
F5 tornado
on the Fujita scale
Highest winds	> 261 mph (420 km/h)
Overall effects
Casualties	3 fatalities, 219 injuries

This tornado was notable because it crossed three state lines: Indiana, Kentucky, and Ohio. It touched down near Rising Sun, Indiana, and crossed the Ohio River into Boone County, Kentucky, producing F4 damage.

The tornado crossed the Ohio River a second time into western Cincinnati, striking the neighborhood of Sayler Park at F5 intensity. Many homes were completely leveled along the hillsides.

Because television news crews were broadcasting live weather coverage, this tornado was filmed in real time by local stations. Three people lost their lives and 219 were injured.

Louisville–Buckner, Kentucky

Louisville-Buckner, Kentucky

The Louisville tornado viewed from Bowman Field
Meteorological history
Duration	22 minutes
Formed	April 3, 1974, 4:37 p.m. CDT
Dissipated	April 3, 1974, 4:59 p.m. CDT
F4 tornado
on the Fujita scale
Overall effects
Casualties	3 fatalities, 207 injuries

Damage in the Northfield neighborhood of Louisville

Around 4:37 p.m. CDT, an F4 tornado formed in southwestern Jefferson County, Kentucky. It moved across Louisville, striking the Kentucky Exposition Center and Freedom Hall.

The tornado crossed Interstate 65 and moved through several residential neighborhoods, including Cherokee Triangle, Crescent Hill, and Northfield. Over 900 homes were destroyed along its 22-mile (35 km) path.

Historic Cherokee Park lost thousands of mature trees. Local radio reporters in helicopters provided live descriptions of the storm's path, helping warn residents in advance. Three people were killed and 207 injured.

Monticello–Rochester, Indiana

Monticello–Rochester, Indiana

Damaged church in Monticello after the tornado
Meteorological history
Duration	2 hours
Formed	April 3, 1974, 4:47 p.m. CDT
Dissipated	April 3, 1974, 6:47 p.m. CDT
F4 tornado
on the Fujita scale
Overall effects
Casualties	18 fatalities, 362 injuries
Damage	$250 million

This F4 tornado traveled 121 miles (195 km), making it the longest-tracked single tornado path of the outbreak. It touched down in Warren County and traveled northeast across northern Indiana.

The town of Monticello, Indiana, was hit particularly hard. The White County Courthouse, several churches, 40 downtown businesses, and three schools were heavily damaged or destroyed.

The tornado also passed through Rochester, Talma, Atwood, and Leesburg. It destroyed lakeside homes along Lake Wawasee and damaged aircraft at Wawasee Airport. Eighteen people died and 362 were injured along the track.

Moulton–Trinity–Tanner, Alabama (First Tornado)

Moulton-Trinity-Tanner, Alabama

The first Tanner tornado viewed near Decatur
Meteorological history
Duration	61 minutes
Formed	April 3, 1974, 6:20 p.m. CDT
Dissipated	April 3, 1974, 7:21 p.m. CDT
F5 tornado
on the Fujita scale
Overall effects
Casualties	28 fatalities, 267 injuries

In the early evening, severe supercells produced strong tornadoes across northern Alabama. The first violent tornado touched down at 6:20 p.m. CDT in Lawrence County, Alabama.

The storm tracked northeast through Mt. Hope and Moulton, sweeping away farmhouses. It crossed the Tennessee River and struck Tanner, Alabama, causing extensive F5 destruction.

The tornado continued into Madison County, damaging rural areas in Harvest, Alabama, before dissipating. It resulted in 28 fatalities and 267 injuries along its 61-minute path.

Jasper–Cullman–Fairview, Alabama

Jasper-Cullman-Fairview, Alabama

Damaged commercial buildings in downtown Jasper
Meteorological history
Duration	2 hours, 2 minutes
Formed	April 3, 1974, 6:44 p.m. CDT
Dissipated	April 3, 1974, 8:48 p.m. CDT
F4 tornado
on the Fujita scale
Overall effects
Casualties	3 fatalities, 178 injuries

This long-tracked F4 tornado touched down in Pickens County and moved northeast across Alabama for more than two hours. It intensified as it entered Walker County, Alabama.

The tornado moved directly through downtown Jasper, Alabama, at 6:57 p.m. CDT. It heavily damaged the county courthouse, downtown stores, and a fire station.

The storm continued across Lewis Smith Lake and passed through southern Cullman, Alabama. Three people were killed, 178 were injured, and approximately 500 buildings were destroyed.

Tanner–Harvest–Hazel Green, Alabama (Second Tornado)

Tanner-Harvest-Hazel Green, Alabama

The second tornado near Harvest, Alabama
Meteorological history
Duration	55 minutes
Formed	April 3, 1974, 7:30 p.m. CDT
Dissipated	April 3, 1974, 8:25 p.m. CDT
F5 tornado
on the Fujita scale
Overall effects
Casualties	22–27 fatalities, 250–270 injuries

Extreme damage near Harvest from the second storm

Just thirty minutes after the first tornado left Tanner, a second violent tornado followed a nearly identical path. It formed at 7:30 p.m. CDT along the north bank of the Tennessee River.

This second storm struck emergency workers and residents who were helping survivors from the first tornado. Buildings damaged during the earlier storm were completely leveled.

The tornado moved through Capshaw, Alabama, Harvest, and Hazel Green, Alabama, before crossing into Tennessee. Between 22 and 27 people died, and more than 250 were injured by this second storm.

Caledonia, Mississippi to Guin–Delmar, Alabama

Caledonia, Mississippi to Guin, Alabama

Severe damage in the center of Guin, Alabama
Meteorological history
Duration	2 hours, 32 minutes
Formed	April 3, 1974, 8:25 p.m. CDT
Dissipated	April 3, 1974, 10:57 p.m. CDT
F5 tornado
on the Fujita scale
Highest winds	285 mph (459 km/h)
Overall effects
Casualties	28 fatalities, 272 injuries

Satellite image showing the visible forest path of the Guin tornado

This nighttime tornado was one of the fastest-moving and most violent storms in the outbreak. It began near Caledonia, Mississippi, at 8:25 p.m. CDT and crossed into Alabama.

The tornado intensified to F5 strength with winds near 285 mph (459 km/h) as it struck Guin, Alabama. Much of the town's downtown business district and residential neighborhoods were swept away.

The storm continued into William B. Bankhead National Forest, leveling a path of trees one mile wide. The damage to the forest was so severe that the path was clearly visible in satellite images from space. Twenty-eight people lost their lives along its 135 miles (217 km) path.

Redstone Arsenal–Huntsville, Alabama

Redstone Arsenal–Huntsville, Alabama

Flash of light from power lines as the tornado enters Huntsville
Meteorological history
Duration	51 minutes
Formed	April 3, 1974, 10:24 p.m. CDT
Dissipated	April 3, 1974, 11:15 p.m. CDT
F3 tornado
on the Fujita scale
Overall effects
Casualties	2 fatalities, 7 injuries

Late in the evening, the same storm system produced an F3 tornado that moved toward Huntsville, Alabama. It struck military buildings at the Redstone Arsenal.

Early warnings allowed personnel to seek shelter, keeping injuries low. The tornado then moved across southern Huntsville, damaging nearly 1,000 buildings, homes, and businesses.

The storm climbed over Monte Sano Mountain before finally dissipating. Two people were killed and seven were injured.

Non-Tornadic Weather Impacts

Winter Weather and Blizzards

While tornadoes hit the South and Midwest, the northwestern side of the storm produced a severe blizzard. Cold air wrapping behind the low-pressure system brought heavy snow to eastern Colorado, Wyoming, and Nebraska.

Parts of Colorado received up to 12 inches (30 cm) of snow, closing schools and highways. In Nebraska, 60 miles per hour (97 km/h) winds created snowdrifts up to 7 feet (2.1 m) high, resulting in widespread power outages.

The Upper Peninsula of Michigan also experienced 12 inches (30 cm) of snowfall, while freezing rain caused dangerous travel conditions across northern roads.

High Winds and Flash Flooding

Severe thunderstorms produced straight-line winds and flash flooding in areas where tornadoes did not touch down. In Oklahoma, wind gusts reached 85 miles per hour (137 km/h), causing power outages and property damage.

Heavy rains fell rapidly across Michigan, dropping 3 inches (7.6 cm) of rain within two hours. This caused flash floods that washed out over 70 road culverts and small bridges in Sanilac County.

Flooding occurred in Georgia when Big Cedar Creek overflowed its banks, requiring 40 residents to evacuate. High straight-line winds also caused tree and power line damage across Virginia and West Virginia.

Relief Efforts and Scientific Legacy

In the days following the outbreak, state governors and the federal government declared disaster areas across affected states. The National Guard was deployed to assist with search and rescue operations, clear blocked roads, and maintain safety.

The American Red Cross and charitable groups established emergency shelters and food stations for families whose homes were damaged. Many volunteers from neighboring towns traveled to hard-hit communities to help clear debris and rebuild.

The 1974 Super Outbreak led to major advances in meteorology:

• Scientists improved Doppler radar technology to detect rotating winds inside clouds before tornadoes reach the ground.
• Weather services modernized emergency warning communications for television and radio stations.
• Researchers refined the Fujita scale to better evaluate structural damage and estimate tornado wind speeds.
• Communities updated building codes and improved emergency shelter plans in schools and public buildings.

Images for kids

• 

  Satellite view showing the storm system on April 3, 1974

• 

  Radar image showing rotating supercell storms over Ohio

• 

  Satellite view of the damage path through Bankhead National Forest

• 

  Map displaying confirmed tornado paths across the eastern United States

• 

  Aerial photo showing destruction in Xenia neighborhoods

• 

  The Depauw and Martinsburg tornado moving across Indiana

• 

  Aerial view of tornado damage in Decatur, Illinois

• 

  Funnel cloud near Knightstown, Indiana

• 

  Tornado approaching the town of Hanover, Indiana

• 

  Aerial photo of the aftermath in Brandenburg, Kentucky

• 

  The large F5 tornado moving through Xenia, Ohio

• 

  The Sayler Park tornado photographed near Cincinnati, Ohio

• 

  The Louisville tornado seen from Bowman Field

• 

  Damaged church structure in Monticello, Indiana

• 

  The first violent tornado near Trinity and Decatur, Alabama

• 

  Damage to downtown storefronts in Jasper, Alabama

• 

  The second violent tornado passing near Harvest, Alabama

• 

  Destruction in downtown Guin, Alabama

• 

  Nighttime electrical flashes from the Huntsville tornado

See Also

• Tornado outbreak
• Fujita scale
• Supercell
• 2011 Super Outbreak
• List of tornadoes and tornado outbreaks