Whats the lowest barometric pressure ever measured in a tornado?
A barometric pressure of 850 mb (25.17 inches) was recorded in a tornado near Manchester, S.D., which is likely the lowest pressure ever recorded in a tornado. The tornado occurred on June 24, 2003, and caused F4 damage. The measured pressure drop of 100 mb as the tornado passed is a record listed in the Guinness Book of World Records. For comparison, Hurricane Katrina (.pdf) had a minimum central pressure of 902 millibars (26.64 inches) on Aug. 28, 2005, while a Category 5 hurricane. This online FAQ from the Storm Prediction Center has many more answers to questions about tornado history. (Answered by Dan McCarthy, warning coordination meteorologist with the Storm Prediction Center in Norman, Okla., Dec.
