[
    {
        "role": "user",
        "content": "what%20is%20the%20rfastgest%20wind%20speed%20recorded%20in%20MPH%20that%20has%20ever%20happened%20on%20the%20earth"
    },
    {
        "role": "assistant",
        "content": "The fastest natural wind speed ever reliably recorded on Earth's surface by an anemometer (not inside a tornado) is **253 mph** (\u2248 408 km/h). This was measured on April 10, 1996, at Barrow Island, Australia, during Tropical Cyclone Olivia. ([guinnessworldrecords.com](https://www.guinnessworldrecords.com/world-records/93573-fastest-wind-speed-recorded-by-an-anemometer?utm_source=openai))\n\nIf you include tornadoes (measured by radar, not surface instruments), then the highest estimated wind speed is about **302 mph** (\u2248 486 km/h) in the Bridge Creek\u2013Moore tornado, Oklahoma, U.S., on May 3, 1999. ([guinnessworldrecords.com](https://www.guinnessworldrecords.com/world-records/73283-fastest-wind-speed-not-surface-speed?utm_source=openai))"
    }
]