The 2011 Super Outbreak
349 tornadoes in four days. 324 dead. Four EF5s in a single afternoon. Fifteen years on, the April 2011 super outbreak is still the largest and deadliest the United States has ever recorded — and the NOAA data shows just how far off the charts April 27 really was.
The 2011 Super Outbreak was the largest tornado outbreak in recorded US history: 349 tornadoes touched down across the eastern United States between April 25 and 28, 2011 (368 counting Canada), killing 324 people directly and injuring more than 2,900. Nearly all of that destruction happened in a single day. When I pulled the NOAA Storm Prediction Center records, April 27, 2011 shows 207 confirmed tornadoes and 319 deaths — the deadliest tornado day the country has seen since the 1925 Tri-State Tornado.
A typical year produces about one EF5 tornado — the strongest rating on the Enhanced Fujita scale. April 27 produced four of them in one afternoon, plus 11 EF4s. Total damage reached $10.2 billion (~$15 billion in 2025 dollars), making it the costliest tornado outbreak on record. Only the 1974 Super Outbreak rates higher for raw intensity, and only because it concentrated seven F5s into far fewer storms.
Below is a day-by-day breakdown straight from the SPC archive, a look at the four EF5s, and how 2011 stacks up against the outbreaks it's most often compared to — including the May 2026 super outbreak that finally ended a 13-year EF5 drought.
Four days, but really one
The outbreak unfolded in waves, but the fatalities were overwhelmingly loaded into April 27. Here's the day-by-day count from the SPC database:
| Date | Tornadoes | Deaths |
|---|---|---|
| Mon, Apr 25 | 46 | 5 |
| Tue, Apr 26 | 56 | 0 |
| Wed, Apr 27 | 207 | 319 |
| Thu, Apr 28 | 40 | 0 |
April 26 produced 56 tornadoes and zero deaths; April 27 produced 207 and 319. (Our count filters the SPC archive to one row per tornado; the NWS puts the April 27 single-day total as high as 224 — either way, the most active tornado day on record.) The difference wasn't the number of storms — it was where they went, how strong they got, and how long they stayed on the ground.
The four EF5s of April 27
Fifteen violent tornadoes (EF4 and EF5) caused 281 of the outbreak's 324 deaths — 87% of the toll from under 5% of the tornadoes. Four of them reached EF5:
Hackleburg–Phil Campbell, Alabama
72 deathsThe deadliest tornado of the outbreak and the deadliest in Alabama history. Wiped out ~75% of Hackleburg before tracking toward Huntsville.
Smithville, Mississippi
23 deathsWinds estimated near 205 mph flattened the small town of Smithville — vehicles were thrown hundreds of yards and a water tower was struck.
Rainsville / Sylvania, Alabama
25 deathsTore across DeKalb County in northeast Alabama, one of four separate EF5-rated tracks that day.
Philadelphia (Neshoba Co.), Mississippi
3 deathsRated EF5 on structural and ground-scouring damage despite a lower death toll thanks to a rural path.
The tornado most people remember, though, wasn't an EF5. The Tuscaloosa–Birmingham tornado — broadcast live as it churned through a major metro area — was rated EF4 and killed 64 people. It's a reminder that the Enhanced Fujita rating measures damage intensity, not death toll: an EF4 through a city can kill more than an EF5 through farmland.
Where the deaths happened
This was a Dixie Alley event — the Deep South, not the Great Plains. Alabama alone accounted for 233 of the 324 deaths. Tennessee actually recorded more tornadoes (72) than Alabama (58), but Alabama's were far more violent and tracked through populated areas.
| State | Tornadoes | Deaths | Weather records |
|---|---|---|---|
| Alabama | 58 | 233 | Alabama records |
| Mississippi | 39 | 38 | Mississippi records |
| Georgia | 13 | 25 | Georgia records |
| Tennessee | 72 | 19 | Tennessee records |
| Arkansas | 28 | 5 | Arkansas records |
| Virginia | 19 | 4 | Virginia records |
The same systems tore through metro areas from Tuscaloosa to Chattanooga — you can see the historical climate for hard-hit cities like Nashville, Memphis, and Atlanta on their city pages.
Why April 27 was so lethal
Three things stacked up. First, the atmosphere was as primed as forecasters ever see it — the SPC issued a rare "high risk" and warned of a "particularly dangerous situation" a full day out. Second, the violent tornadoes were long-track: the Hackleburg EF5 stayed on the ground for 132 miles — long enough to cross five counties and level several towns before it lifted.
Third, and most important, this was the Deep South. Our SPC analysis shows Southeastern tornadoes kill at nearly three times the rate of Great Plains tornadoes — more mobile homes, hillier and more forested terrain that hides funnels, denser rural population, and a longer storm season. The 2011 outbreak is the single clearest illustration of why the region earns the "Dixie Alley" label.
The warnings worked, for what it's worth. NWS lead times were long and accurate; the problem in 2011 wasn't detection, it was the sheer violence and the number of people in the path. The disaster reshaped how the Weather Service words its most urgent alerts and accelerated the rollout of impact-based warnings that spell out the threat in plain language.
How 2011 compares
| Event | Tornadoes | Deaths | EF5/F5 |
|---|---|---|---|
| 2011 Super Outbreak | 368 | 324 | 4 |
| 1974 Super Outbreak | 148 | 319 | 7 |
| May 2026 Super Outbreak | 206 | 78 | 1 |
| 1925 Tri-State (single tornado) | 1 | 695 | 1 |
For the full ranking of the country's worst events, see our deadliest tornadoes in US history analysis, and the year-by-year picture on our 2026 tornado season tracker.
Explore the tornado record yourself
Every tornado in this article comes from the NOAA SPC database, which we've made browsable. Map any state, filter by rating, or dig into individual events: