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https://www.noaa.gov/media/digital-library-photo/pl23nssl0030jpgDescription
During the early 1980s, NSSL and University of Oklahoma researchers place TOTO(TOtable Tornado Observatory) in the path of an on-coming tornado.It would measure temperature, pressure, relative humidity etc.It would record the data on tape inside the 55 gallon drum.TOTO was hit by a small tornado only once in April, 1985. (Image credit: NOAA Photo Library, NOAA Central Library; OAR/ERL/National Severe Storms Laboratory (NSSL))