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The 1973 Union City, Okla., tornado was the first captured by Doppler radar and chase personnel.

Photo of the 1973 Union City, Okla., tornado, first tornado captured by Doppler radar.

The 1973 Union City, Oklahoma tornado, shown here, was the first tornado captured by the National Severe Storms Laboratory Doppler radar and chase personnel. This tornado is in its early stage of formation.

Credit: NOAA

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