Figure 1 depicts the surface observations at 2:00 am EDT, which shows a cold front moving across the northeast United States. This front became the focus for intense thunderstorms in the afternoon hours of July 11th, which ultimately led to this F2 tornado, two F1 tornadoes in Worcester County and an F2 tornado in Middlesex County.
The Grounts Corner, MA F2 tornado of July 11, 1958 impacted Franklin County in Massachusetts. According to NOAA (2019), the F2 tornado caused no fatalities or injuries, but caused $2.5 thousand dollars in property damage. The tornado touched down in Franklin County near Millers River at 4:30 pm EDT. The tornado travelled for 1 mile and had a maximum width of 100 yards.
Sources
NOAA Central Library. (2019). U.S. Daily Weather Maps. Friday July 11, 1958 [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/
