Info Taken from the NWS (update info from NCDC)

This info come from the NCDC.....

Did this storm break a national low pressure record? No. Bigfork, Minnesota recorded the lowest pressure in the U.S. for this particular storm. Bigfork had a minimum sea level pressure of 955.2 millibars (28.21") at 5:13 PM CDT. This set a new record low sea level pressure for Minnesota. However, this turns out to be the second lowest sea level pressure for a non-tropical (extratropical) low pressure system in the Continental United States. The National Climatic Data Center determined that the lowest CONUS, land-based, non-tropical, sea level pressure that can be confirmed is 955.0mb (28.20"). This occurred twice in United States history. The first time was on January 3, 1913 at Canton, NY. The second was on March 7, 1932 at Block Island, Rhode Island. These were verified by the NCDC using archived climate data publications. Many storms have been discussed as potential record holders for the lowest recorded sea level pressure in a non-tropical storm at a land-based observing station in the Continental United States (CONUS). The lowest that has been mentioned was 951.6 millibars at Bridgehampton, NY on March 3, 1914. However, this value cannot be confirmed by records held at the National Climatic Data Center (NCDC).





Older post...This info form the NWS...
New Record Low Pressure for a Non-Tropical Storm in the Continental U.S.


A new record was set on October 26th for the lowest pressure in a non-tropical storm in the mainland U.S.



The massive storm system barreling across the central U.S. had a minimum central pressure of 28.24" or 956 mb (equivalent to the minimum pressure of a Category 3 hurricane).



This breaks the old record of 28.28" (958 mb), set on Jan. 26, 1978, during the Blizzard of 1978 (aka the Cleveland Sueprbomb). This is also lower than the March 1993 Superstorm (aka "The Storm of the Century"), or the "Witch of November" storm that sank the Edmund Fitzgerald in 1975, or even the Columbus Day Storm of Oct. 1962.



Read the latest summary of the storm—including reports of peak wind gusts—from the NWS Hydrometeorological Prediction Center:



http://www.hpc.ncep.noaa.gov/discussions/nfdscc1.html