Union City Tornado Makes History
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The first tornado captured by the NSSL doppler radar and NSSL chase personnel. The tornado is here in its early stage of formation.

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NSSL's first Doppler Weather Radar located in Norman, Oklahoma. 1970's research using this radar led to NWS NEXRAD WSR-88D radar network.

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Damage path of the Union City tornado with sketches of the funnel and associated debris cloud as seen from the south. Letters A through H indicate damaged farmsteads.

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Source:
The Union City, Oklahoma Tornado of 24 May 1973
NOAA Technial Memorandum ERL NSSL-80 (December 1976)