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Horsepower (hp) is a unit of measurement of power, or the rate at which work is done, usually in reference to the output of engines or motors. There are many different standards and types of horsepower.
On May 3, 1999, the highest wind speeds recorded on Earth at 321 mph (517 km/h) took place during the 1999 Bridge Creek–Moore tornado outbreak. The estimated costs were $1 billion (about $1.8 billion in 2024). This event was the first issued tornado emergency by the National Weather Service in history.