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A pressure deficit of 100 mb (hPa) was observed when a violent tornado near Manchester, South Dakota on June 24, 2003 passed directly over an in-situ probe. In less than a minute the pressure dropped to 850 mb (hPa), which is the lowest pressure ever recorded at the Earth's surface when adjusted to sea level.[11] There is a questionable and unofficial citizen's barometer measurement of a 192 mb (hPa) drop around Minneapolis, Minnesota in 1904.[12] From Wikipedia http://en.wikipedia.org/wiki/Tornado_records

Confirmed at NOAA

http://www.crh.noaa.gov/fsd/storms/tor062403/samaras/samaras.php

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the lowest air pressure is the exosphere

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Q: What is the lowest air pressure on record for the United States of America?
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