At 1145 EST, a quick-hitting F3 hit parts of Montgomery County, PA. The official path is only 2 miles. The tornado paralleled Limerick Road on its western side and moved right over a housing development called “The Hamlet”. It was a newer development. Per Storm Data, “Of the 27 inhabited houses, 4 were leveled, 16 were damaged beyond repair, 1 under construction was destroyed and only 7 remained liveable. Damage in this development alone was $2 million.”
Fujita researched this tornado family and the influence that microbursts may have had on them. Per Grazulis, “Professor Fujita’s mapping of the Canton tornado family shows how microbursts and/or other downburst-type winds move the tornado from side to side and may influence its intensity. Microburst m2 might have caused the break in the path. Otherwise the event might have been a single tornado. Microburst m6 might have caused the tornado to intensify. Both deaths were in that area.” (Grazulis, 1178)
A significant tornado crossed through parts of Stearns and Sherburne Counties in Minnesota on July 22, 1967. This tornado is officially listed in the SPC Tornado Database with a rating of F2. Grazulis has a rating of F3.
It was called the most damaging Minnesota tornado to date, but Thomas Grazulis in Significant Tornadoes questions that statement. He believes this was a “complex combination of tornadoes and microbursts” and that much of the damage was due to the strong microbursts.