A bombing surface low (40mb in 24hrs) sped northward into Ohio during the overnight hours of Jan 26, 1978 sucking in cold arctic air from the upper midwest, causing severe blizzard conditions, winds 50-70 mph with gusts to 100, temps dropping to near 10º, and 1-3 ft of snow with up to 25 ft drifts. 70 deaths blamed on the storm. I-75 was closed for 3 days.
Record low barometric pressures were recorded throughout the area, bottoming out at 955mb near Detroit, which is lower than the 961mb of the 1993 Superstorm.

Sources: Extreme American Weather by Tim Vasquez
http://www.crh.noaa.gov/mkx/climate/big.php
http://www.intellicast.com/DrDewpoint/Library/1371/
http://dept.kent.edu/ksutop_story/archive_98/980121_blizzard_of_78_shmid.html