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Oklahoma: Risks & Trends

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Same standard as every other page on this site: every figure below is independently sourced, and figures that vary across sources, or measure genuinely different things, are flagged as such rather than collapsed into one number that looks more precise than the underlying data actually supports.

The Bridge Creek-Moore tornado (1999): the highest wind speed ever recorded on Earth

MetricFigure
Peak rating F5
Peak measured wind speed 321 mph ±20 mph (revised upward from an initial 1999 measurement of 301 mph in a 2021 reanalysis)
Measurement method Mobile Doppler radar (Doppler on Wheels), University of Oklahoma
Direct deaths 36
Indirect deaths 5
Injuries 583
Path length 38 mi
Duration 1 hr 25 min
Damage (1999 dollars / 2025-adjusted) $1 billion / ~$1.9 billion

Why the record wind speed figure changed

The originally reported 301 mph measurement was revised to 321 mph following a 2021 scientific reanalysis of the original radar data, with a stated margin of error of ±20 mph either way. This still stands as the highest wind speed ever measured inside a tornado, or anywhere on Earth, by direct instrumentation.

The Moore tornado (2013): the same city, an EF5 again

MetricFigure
Peak rating EF5
Deaths 24 (7 children at Plaza Towers Elementary)
Injuries 377
Peak width ~0.5 mi
Peak winds ~200 mph
Buildings damaged or destroyed ~2,400, including two elementary schools and Moore's only hospital
Damage estimate $2-3.5 billion (estimates varied widely in the weeks after the event)

Nine of the tornado’s deaths, beyond the 7 at Plaza Towers, occurred in eight different homes within a quarter mile of the school, concentrated in the same immediate area.

What these two have in common

The two Moore tornadoes, separated by 14 years, demonstrate that Oklahoma’s most extreme tornado risk isn’t randomly distributed, certain corridors within Tornado Alley, Moore among them, have now been struck by top-of-scale tornadoes more than once within a single generation. That history is a direct argument for permanent storm shelter infrastructure rather than treating a single close call as reason enough to feel safe going forward.

Sources