Are there any other tornado strength scales in use?
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Yes. In Great Britain meteorologists use the TORRO (the TORnado and storm Research Organisation) Scale, which is divided into T0 through T10 measurements of strength. A T0 tornado has winds beginning at 40 miles (64 kilometers) per hour, and a T10 is a “Super Tornado” with wind speeds of 270 to 299 miles (435 to 480 kilometers) per hour.