The Modern EF5 Drought

The United States has not had an officially rated EF5 tornado since Moore, Oklahoma on May 20, 2013. As of 2026, that's 13 years - the longest EF5-caliber drought in modern history. Meteorologists debate whether this reflects actual reduction in tornado intensity or a stricter application of damage-based rating criteria.

The Numbers

Last EF5: Moore, OK - May 20, 2013
Time since: Over 13 years and counting
Previous longest gap: 8 years (F5s were less frequent in the 1960s-80s)
Total US EF5s ever: 9 (since scale started in 2007)

Modern Near-EF5 Events

Several recent tornadoes have shown damage or radar signatures consistent with EF5 but were rated EF4:

Bassfield, MS (April 12, 2020) - Long-track EF4, some damage indicators consistent with EF5
Mayfield, KY (December 10, 2021) - EF4, 165-mile path, widespread devastation
Rolling Fork, MS (March 24, 2023) - EF4, near-total town destruction
Sulphur, OK (April 27, 2024) - long-track EF3
El Reno, OK (May 31, 2013) - EF3 despite radar-measured 296 mph winds

Theories for the Drought

1. Stricter Rating Standards

The most-discussed explanation. Since 2013, NWS survey teams have been more conservative in assigning EF5 ratings. Damage indicators require engineered structures failing at specific ways - not just total destruction. Meteorologists argue:

Modern buildings have varying construction quality that's hard to evaluate
Foundation-sweeping alone is not sufficient without engineered anchor documentation
The tornado must strike well-documented structures at peak intensity

2. Statistical Variation

EF5 tornadoes are rare - about 1 per year on average during the 2007-2013 period. Long gaps are statistically possible even without underlying changes.

3. Climate Shift

Related to Tornado Alley 2.0: activity shifting east into Dixie Alley may reduce EF5 potential because:

Southeastern tornadoes tend to be shorter-lived
HP (high-precipitation) supercells produce fewer classic EF5 events
Great Plains cyclic supercells (traditional EF5 producers) have decreased

4. Detection Bias

Some argue we've been better at detecting the total structure damage that would rate EF5 in previous eras, but the surveys are now more conservative.

The Debate

Meteorologists have been arguing over the drought for years:

Position 1: "There have been near-EF5 events; the ratings are too conservative."
Position 2: "The damage genuinely hasn't met EF5 criteria."
Position 3: "Individual case-by-case; the drought is likely partly both."

Consequences of the Drought

Even with the drought, deadly tornadoes continue:

Rolling Fork 2023 killed 21 people despite EF4 rating
Mayfield 2021 killed 57 in Kentucky alone
2019 Beauregard AL EF4 killed 23
2020 Nashville EF3 killed 25

Rating debates matter for scientific classification, but human suffering doesn't discriminate by rating.

What Might End the Drought

Several scenarios could produce a rated EF5:

A violent tornado directly striking a well-engineered structure (skyscraper, industrial facility, hardened building)
A slow-moving multi-vortex event similar to Jarrell 1997
A change in NWS rating philosophy toward including radar measurements
A tornado producing damage across many EF5-suitable damage indicators simultaneously

The Statistical Bet

Statistically, another EF5 is likely eventually. The pre-2013 era averaged ~1 EF5 per year. The current gap is 13x above that average. Even under the strictest rating standards, the odds favor a future EF5 assignment.

When it happens, the meteorology community will scrutinize the rating carefully - as with every EF5 assignment. Until then, the drought continues.

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