The Worst Derechos in US History
A derecho can flatten a swath of the country hundreds of miles long in a single afternoon — with hurricane-force winds and almost no warning. Here are the most destructive on record, ranked, and how the August 11, 2026 Midwest derecho compares.
The worst derecho in US history is the August 10, 2020 Iowa derecho — it caused $11.5 billion in damage, making it the costliest thunderstorm event ever recorded in the United States, with winds near 140 mph in Cedar Rapids. The deadliest was the June 29, 2012 mid-Atlantic derecho, which killed 22 people on an 800-mile run from Iowa to Washington, D.C. Both did what only a derecho can: turn a line of ordinary summer thunderstorms into an inland hurricane.
Searches for “derecho” broke out this month for a reason. On August 11, 2026, a fresh derecho carved a 400-mile path from eastern Iowa through the Chicago suburbs and into the Appalachians, killing three and cutting power to more than 700,000. It's the latest entry in a very short, very destructive list.
Derechos are rarer than tornadoes and less famous than hurricanes, so a clean ranking of the worst ones is surprisingly hard to find. We built one — ordered by a mix of death toll, damage, and geographic scale — and pulled NOAA rainfall records for the 2026 event to show a side of it the wind reports missed.
What Counts as a Derecho?
Not every bad windstorm is a derecho. Meteorologists reserve the term for a specific, measurable thing. The word is Spanish for “straight ahead” — the opposite of a tornado, which is Spanish-derived tornar, “to turn.”
- A swath of wind damage at least 60 miles wide
- A path extending more than 240 miles
- Numerous gusts of at least 58 mph, with several reaching 75 mph or more
- Produced by a single, progressive cluster of storms lasting 3+ hours
The damage engine is the downburst: rain-cooled air plunges out of a thunderstorm, hits the ground, and fans out at highway speed. String enough downbursts together in a fast-moving line — a “bow echo” on radar — and you get a derecho.
The 9 Worst Derechos in US History
Ranked by overall impact — a combination of deaths, damage, and the size of the area hit. Peak wind gusts and paths are from NOAA Storm Prediction Center and National Weather Service surveys.
The Midwest ("Iowa") Derecho
The costliest thunderstorm event in modern US history. A single line of storms raced 770 miles across the Corn Belt in about 14 hours, hammering an area larger than 90,000 square miles with hurricane-force winds. Cedar Rapids, Iowa took the worst of it — estimated gusts near 140 mph, comparable to a strong Category 4 hurricane, but sustained for far longer than a tornado. Roughly two-thirds of the city's tree canopy was destroyed in minutes.
The Mid-Atlantic / Ohio Valley Derecho
The deadliest derecho of the modern era. Born over Iowa on a record-hot afternoon, it ran 800 miles in about 12 hours, reaching the Washington, D.C. area by nightfall. It killed 22 people — several crushed by falling trees — and knocked out power to more than 4 million customers in the middle of a brutal heat wave, with temperatures over 100°F. Some homes had no power for a week.
The Houston Derecho
A derecho tore through the fourth-largest city in the country during the Thursday evening rush. Estimated 100 mph winds blew out windows in downtown Houston skyscrapers, raining glass onto the streets below, and left more than 1 million homes and businesses without power — some for a week, during the first serious heat of the season. Eight people died.
The August 2026 Midwest Derecho
The most recent major derecho — and the reason searches for the word spiked this month. On the afternoon of August 11, 2026, a bow echo swept out of eastern Iowa, blasted the south and southwest Chicago suburbs and northwest Indiana with 70 to 100+ mph winds, then reorganized over the Ohio Valley and pushed into the central Appalachians. A peak gust of 99 mph was clocked at Gary/Chicago International Airport. At least three people died — including one in Portage, Indiana, when a house exploded — and more than 700,000 lost power.
The Boundary Waters–Canadian Derecho (the "BWCA Blowdown")
One of the most extraordinary derechos ever documented — not for the cities it hit, but for the wilderness it leveled. Over the July 4th weekend, the storm flattened an estimated 25 million trees across more than 370,000 acres of the Boundary Waters Canoe Area Wilderness in northern Minnesota, a roadless expanse where thousands of campers were scattered across remote lakes with no warning and nowhere to shelter.
The May 2009 "Super Derecho"
Meteorologically the strangest event on this list. The May 2009 derecho wrapped up an intense, hurricane-like mesoscale vortex over southern Missouri and Illinois — a rotating core so well-defined that some researchers nicknamed it an "inland hurricane." It produced widespread wind damage independent of the more conventional bow-echo winds ahead of it.
The Corn Belt Derecho
A classic warm-season Corn Belt derecho that ran the same corridor the 2020 storm would follow 22 years later. It knocked down power lines and flattened crops across five states in the heart of the growing season, a reminder that this stretch of the Midwest is the most derecho-prone region on Earth.
The "More Trees Down" Derecho Series
A series of destructive windstorms during the deadly summer of 1980 — the same heat wave that killed more than 1,000 people nationwide. Meteorologist Ted Fujita's damage surveys documented embedded downbursts of 100+ mph within the broader wind swath as the storms ran from the Chicago area toward Detroit.
The May 2022 Midwest Derecho
A prolific spring derecho that produced a record-setting number of severe wind reports for the region in a single day. Ahead of the winds, the storm kicked up a massive haboob — a wall of dust — across South Dakota, turning the sky an eerie brown before the 100+ mph gusts arrived.
August 11, 2026: A Wind Story That Became a Flood Story
The 2026 derecho is a good illustration of how these storms change character as they travel. On the Iowa and Chicago end, this was purely a wind event — our NOAA station records show barely any rain fell as the bow echo raced through:
| Station (Aug 11, 2026) | Rainfall | Role in the storm |
|---|---|---|
| Moline / Quad Cities, IL | 0.12 in | Leading edge — all wind |
| Dubuque, IA | 0.39 in | Early bow echo |
| Chicago Midway, IL | 0.66 in | Peak wind damage zone |
| Chicago DuPage, IL | 0.80 in | Peak wind damage zone |
| Columbus, OH | 2.16 in | System slows — flooding begins |
| Charleston, WV (Yeager AP) | 3.27 in | Appalachian flooding tail |
By the time the storm reached the central Appalachians, it had slowed enough to unload — 3.27 inches on Charleston, West Virginia in a single day. That's the pattern behind the flooding reports across Ohio, Kentucky, West Virginia, and Virginia that followed the wind damage. You can look up the weather on any day in your own city the same way.
Derecho vs. Tornado vs. Hurricane
All three bring destructive wind, but they behave completely differently. This is the fastest way to tell them apart.
| Feature | Derecho | Tornado | Hurricane |
|---|---|---|---|
| Wind type | Straight-line | Rotating | Rotating (broad) |
| Damage area | 100s of miles long | Yards to ~1 mile wide | Hundreds of miles wide |
| Warning time | Minutes to ~1 hour | Minutes | Days |
| Duration at a spot | 5–30 minutes | Seconds to minutes | Hours to days |
| Peak winds | 60–140 mph | Up to ~300 mph | 74–190+ mph |
| Season | Late spring–summer | Spring peak | Summer–fall |
The confusion is understandable — derechos often spawn tornadoes along their leading edge, as the 2020 (26 tornadoes) and 2026 (6 tornadoes) events both did. For the rotating side of the story, see our tornado history hub and the deadliest tornadoes in US history.
Why the Same States Keep Getting Hit
Look at the ranking and one thing jumps out: Iowa, Illinois, and Indiana appear over and over. That's not coincidence. The eastern Great Plains through the Ohio Valley is the most derecho-prone region on the planet, and it comes down to a summer pattern forecasters call the “ring of fire.”
When a strong heat dome (the Bermuda High) parks over the southern US, fast upper-level winds ride along its northern rim — right across the Corn Belt. Clusters of storms form on that rim in the late-afternoon heat and get shoved eastward for hundreds of miles without breaking apart. It's the same setup that drives the region's worst heat waves, which is why derechos and dangerous heat so often arrive together — as they did in 2012 and 1980.
The damage keeps climbing for a simpler reason: there is more to break. More homes, more power lines, more pavement, and — in the Corn Belt — a full season of crops standing in the path. A derecho that would have been a footnote in 1950 is now a multibillion-dollar disaster. See how the broader picture of US weather records and worst floods fits alongside these windstorms.
Frequently Asked Questions
What was the worst derecho in US history?
The August 10, 2020 Midwest derecho is the worst on record. It caused $11.5 billion in damage — the costliest thunderstorm event in modern US history — with estimated 140 mph winds in Cedar Rapids, Iowa, across a 770-mile path. The deadliest derecho was June 29, 2012, which killed 22 people from Iowa to Washington, D.C.
What is a derecho?
A derecho is a widespread, long-lived windstorm made of straight-line thunderstorm winds, not rotation. To qualify, the damage swath must be at least 60 miles wide, run more than 240 miles, and include multiple gusts of at least 58 mph with several reaching 75 mph or more. The word means "straight ahead" in Spanish.
What is the difference between a derecho and a tornado?
A tornado is a narrow, rotating column of air that carves a path a few hundred yards wide. A derecho is a wall of straight-line winds that can flatten a swath hundreds of miles long and dozens of miles wide in one pass. Derecho winds blow in one direction; tornado winds spiral. Derechos affect far more land area, while the strongest tornadoes reach higher peak wind speeds.
Where do derechos happen most often?
The corridor from the eastern Great Plains through the upper Midwest and Ohio Valley — Iowa, Illinois, Indiana, and Missouri — is the most derecho-prone region on Earth. Warm-season derechos ride the northern edge of the Bermuda High down this corridor, which is why the same states appear on nearly every worst-derecho list.
Are derechos getting worse?
The long-term trend is still being studied, but the damage is clearly rising because more people, power lines, and pavement now sit in the derecho corridor. The 2020 Iowa derecho ($11.5 billion) and the 2024 Houston derecho (over $1 billion) show how a single windstorm hitting a metro area or a full growing season can now rival a hurricane in cost.