Figure 1 depicts the surface observations at 8:00 am EDT, which shows a low pressure system across the Great Lakes with a cold front extending across the northeast United States. This cold front became the focus for thunderstorms in the afternoon hours of September 29th, which ultimately led to this strong F3 tornado.
The Tewksbury, MA F3 tornado of September 29, 1974 impacted Middlesex County in Massachusetts. According to NOAA (2019), the F3 tornado caused no fatalities, but caused 1 injury and caused $250 thousand dollars in property damage. The tornado touched down near Chandler Street at 5:05 pm EDT. The path of the tornado was not documented by NOAA, but it had a maximum width of 33 yards.
NOAA Central Library. (2019). U.S. Daily Weather Maps. Sunday September 29, 1974 [PDF]. Retrieved from https://library.noaa.gov/Collections/Digital-Collections/US-Daily-Weather-Maps
NOAA National Centers for Environmental Information (2019). Storm Events Database. Retrieved from: https://www.ncdc.noaa.gov/stormevents/