On October 3, 1979, a significant tornado hit without warning in Hartford County, CT. This was one of the most destructive twisters to ever hit the state of Connecticut. There was another F4 to hit New Haven County, CT on July 10, 1989 which caused similar monetary damage. This 1979 tornado though is the deadliest tornado on record for Connecticut (1950-present). There were three fatalities. The deadliest known tornado in Connecticut was the 1878 Wallingford tornado – 34 killed on August 9, 1878. (Grazulis, 596). Read the detailes about this event here!