The May 2026 Super Tornado Outbreak

On May 13, 2026, 162 tornadoes touched down across the upper Midwest and Great Plains in a single 24-hour period — the second-highest count ever recorded, behind only the April 27, 2011 super outbreak (224 tornadoes). By the time the storms subsided on May 14, 206 tornadoes had been confirmed across 12 states, 78 people were dead, and more than 1,700 were injured. Preliminary damage estimates range from $8 to $12 billion.

The most violent tornado — and the one that rewrote meteorological history — struck Rochester, Minnesota. NWS damage surveys confirmed it as an EF5, with winds exceeding 205 mph. It was Minnesota's first EF5 ever, and the first in the entire United States since Moore, Oklahoma on May 20, 2013. That's a 13-year gap — the longest stretch without an EF5 since the Enhanced Fujita scale was adopted in 2007.

I went through the NOAA Storm Prediction Center records to put this outbreak in context. The numbers tell a clear story: May 2026 was the deadliest tornado event in 15 years, and the developing El Niño pattern that helped fuel it isn't going anywhere. The rest of tornado season could be just as active.

The Storm Prediction Center issued a rare High Risk for severe weather on May 12 — only the second High Risk of 2026 (the first was the April 17–18 outbreak). A deep trough dug into the northern Plains while a 60-knot low-level jet streamed Gulf moisture into Minnesota, Iowa, and Wisconsin. Surface dewpoints hit 75°F across southern Minnesota — a moisture level more typical of Louisiana in August than the upper Midwest in May.

Rochester is the third-largest city in Minnesota, home to the Mayo Clinic and about 125,000 people. It's not a place anyone associated with violent tornadoes. That changed at 4:47 PM on May 13.

The tornado touched down in rural Olmsted County, 8 miles southwest of downtown Rochester. Over its 22.3-mile path, it widened to nearly a mile and strengthened to EF5 intensity as it crossed into the city's southern and southeastern neighborhoods. NWS damage surveys documented complete destruction of well-built residential structures swept clean to foundations — the defining characteristic of EF5 damage. Estimated peak winds exceeded 205 mph.

It was only the second significant tornado to strike Rochester. The first was on August 21, 1883 — 143 years ago — and that tornado killed 37 people, leading the city's residents to establish the medical practice that eventually became Mayo Clinic. In a grim historical echo, the 2026 EF5's death toll was similar.

The Rochester EF5 joins a list of 60 F5/EF5 tornadoes documented in the US since 1950. Minnesota had produced exactly zero EF5s on the Enhanced Fujita scale (adopted 2007). The last F5-rated tornado in the state was the Chandler–Lake Wilson tornado on June 16, 1992 — 34 years ago. The 13-year national gap since the 2013 Moore EF5 had led some meteorologists to wonder whether improved construction or changing storm characteristics might reduce EF5 occurrences. Rochester answered that question.

I pulled NOAA SPC data for every major outbreak since 1950 to rank this event. The May 2026 super outbreak lands as the 2nd largest by 24-hour tornado count and the 3rd costliest on record. Only the April 2011 Super Outbreak and the March 2025 outbreak caused more damage.

The May 13–14 outbreak wasn't an isolated event. 2026 has been violent from the start. As of mid-May, approximately 550 tornadoes have been confirmed across the US — above the historical average pace of about 500 by this date (NOAA NCEI 1991–2020 baseline). Two separate outbreaks have produced EF4+ tornadoes before Memorial Day.

The April 17–18 outbreak produced 76 tornadoes and killed 12 people across 8 states — a major event in its own right. Combined with the May super outbreak, 2026 has already produced two of the 15 deadliest outbreaks in the last 20 years, and we haven't reached peak season yet (historically, the week of May 19–26 produces the most tornadoes nationally).

For comparison: the record year was 2011, which finished with 1,691 tornadoes. At the current pace, 2026 could approach 1,300–1,400 — well above the AccuWeather forecast of 1,050–1,250. But tornado counts are inherently noisy. A single quiet month can change the trajectory.

Three ingredients combined to create the May 13–14 setup, and all three have roots in the developing 2026 El Niño.

The El Niño connection matters for the rest of 2026. NOAA's Climate Prediction Center gives an 82% chance of El Niño forming by July, and a 2-in-3 chance it reaches “strong” or “very strong” intensity. Strong El Niño events correlate with increased severe weather across the Midwest and southern Plains. The hurricane season may be suppressed, but tornado and severe storm risk isn't going away.

The same storm system that devastated the upper Midwest pushed into Manitoba and Ontario. Environment Canada confirmed 39 tornadoes on May 13–14 — demolishing the previous Canadian record of 18 tornadoes in a single outbreak. Several tornadoes crossed the international border between Minnesota and Manitoba.

Canada's tornado climatology is less studied than the US, partly because population density is lower and many tornadoes go unreported. But this outbreak — striking near Winnipeg, Canada's 7th-largest city — underscored that violent tornado risk extends well north of the traditional Tornado Alley corridor.