The Biggest Tornado Ever Measured – Mulhall, Oklahoma 1999

Late on May 3rd, 1999 — the same night an F5 tore through Moore, Oklahoma and killed 36 people — a second monster was crossing the dark farmland near the tiny town of Mulhall. Almost no one remembers it. It may have been the biggest tornado ever measured. Storm researcher Joshua Wurman had his Doppler on Wheels radar pointed straight at it, and the screen showed something that shouldn’t exist: a rotating core nearly a mile wide, with winds clocked around 302 mph and smaller tornadoes orbiting inside the big one like horses on a carousel. Its circulation was roughly twice the width of the famous Moore tornado — meaning its total destructive power may have been even greater. Yet it was officially rated only F4. Not because it was weaker, but because it crossed open farmland with little to destroy, and the rating system scores damage, not measured wind. This is the story of the forgotten giant — the record-breaker that killed no one, missed the cameras, and quietly rewrote what we thought a tornado could be."