Stewartville, MA F1 Tornado of August 17, 1970

Figure 1 depicts the surface observations at 8:00 am EDT, which shows a cold front moving across Massachusetts. This front was the focus of thunderstorms in the early morning hours of August 2nd, which ultimately led to this tornado.

Figure 1. Surface weather map for August 17, 1970 at 8:00 am EDT (NOAA, 2019).

The Stewartville , MA F1 tornado of August 17 , 1970 impacted Franklin County in Massachusetts. According to NOAA (2019), the F1 tornado caused no fatalities or injuries, but caused $250 thousand dollars in property damage. The tornado touched down near River Road at 7:45 am EDT. The tornado travelled for 16.7 miles and had a maximum width of 33 yards. The tornado ended in New Hampshire near Richmond.


NOAA Central Library. (2019). U.S. Daily Weather Maps. Monday August 17, 1970 [PDF]. Retrieved from

NOAA National Centers for Environmental Information (2019). Storm Events Database. Retrieved from: