Jeff Boyne, NWS La Crosse, WI
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|On November 11, 1940, a rapidly deepening low pressure system moved northeast from Kansas City, MO northeast through the Upper Mississippi River Valley and into the Upper Great Lakes. This low pressure area produced the lowest pressure reading ever recorded up to this time at Charles City, IA (28.92 inches), La Crosse, WI (28.72 inches), and Duluth, MN (28.66 inches). The lowest pressure recorded by this storm system in the United States was 28.57 inches at Houghton, MI (6:30 PM CST on November 11th).
Some of the other low barometric pressure readings from are listed below.
La Crosse, WI barograph tracing the barometric pressure from November 9-13, 1940. The lowest pressure during this storm was recorded (28.72 inches reduced to sea level) occurred around noon on November 11. This pressure reading is the fourth lowest in La Crosse. The only other dates to have lower pressures were on October 26, 2010 (28.685 inches); November 10, 1998 (28.691 inches); and April 3, 1982 (28.70 inches).