Figure 1 depicts the surface observations at 2:00 am EDT, which shows a cold front slicing through southern Ontario and a warm front advecting northward across the northeast United States. A line of thunderstorms (squall line) is also observed ahead of the cold front. The squall line observed in Figure 1 later became responsible for this tornado and an F2 tornado.
The Skinner State Park, MA F1 tornado of July 5, 1957 impacted Hampshire County in Massachusetts. According to NOAA (2019), the F1 tornado caused no fatalities or injuries, but caused $2.5 thousand dollars in property damage. The tornado touched down in Hampshire County near Mountain Road at 8:20 am EDT. The tornado travelled for 1 mile and had a maximum width of 33 yards.
NOAA Central Library. (2019). U.S. Daily Weather Maps. Friday July 5, 1957 [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/