1973 Union City tornado
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On May 24, 1973, a large and well-documented tornado moved across Canadian County, Oklahoma, striking the town of Union City. The tornado, which was on the ground for 26 minutes, killed two people and
The tornado, photographed by a National Severe Storms Laboratory research team
A photo of the tornado nearing the end of its life after tracking through Union City.
NSSL researchers observing the tornado
Tornado vortex signature
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A tornadic vortex signature, abbreviated TVS, is a Pulse-Doppler radar weather radar detected rotation algorithm that indicates the likely presence of a strong mesocyclone that is in some stage of tor
Typical display of a tornado vortex signature (the downward-pointing triangle near the mesocyclone) on a National Weather Service Doppler weather radar display (here the case of the 1999 Bridge Creek-Moore tornado).