Greatest Pressure Drop
A pressure deficit of 100 millibars (2.95 inHg) 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 millibars (25.10 inHg), which is the lowest pressure ever recorded at the Earth's surface when adjusted to sea level.
On April 21, 2007, a 194 millibars (5.73 inHg) pressure deficit was reported when a tornado struck a storm chasing vehicle in Tulia, Texas. The tornado was relatively weak and caused only EF2 damage as it passed through Tulia. The reported pressure drop far exceeds that which would be expected based on theoretical calculations.
There is a questionable and unofficial citizen's barometer measurement of a 192 millibars (5.67 inHg) drop around Minneapolis, Minnesota in 1904.
Famous quotes containing the words drop, greatest and/or pressure:
“Water, water, everywhere,
And all the boards did shrink;
Water, water, everywhere
Nor any drop to drink.”
—Samuel Taylor Coleridge (17721834)
“If I tell you that I would be disobeying the god and on that account it is impossible for me to keep quiet, you wont be persuaded by me, taking it that I am ironizing. And if I tell you that it is the greatest good for a human being to have discussions every day about virtue and the other things you hear me talking about, examining myself and others, and that the unexamined life is not livable for a human being, you will be even less persuaded.”
—Socrates (469399 B.C.)
“The mother whose self-image is dependent on her children places on those children the responsibility for her own identity, and her involvement in the details of their lives can put great pressure on the children. A child suffers when everything he or she does is extremely important to a parent; this kind of over-involvement can turn even a small problem into a crisis.”
—Grace Baruch (20th century)