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Instead of leveling off, however, the jet descended in less than 40 seconds at an estimated rate 157 feet per second (9,430 feet per minute [92] (more than 150 feet per second or 100 miles per hour (160 km/h)), and impacted at 9:20 p.m. local time, with such force that the flight data recorder was never located. [93]
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.