1985 United States–Canada tornado outbreak

Satellite loop on May 31, showing a line of thunderstorms developing across Canada, Ohio, Pennsylvania and New York during the tornado outbreak The upper air pattern was conducive for a major severe weather event in the Great Lakes that Friday, May 31. An unseasonably deep low-pressure system at 984 hPa crossed out of the Midwestern U.S. through the day, and then into the Upper Peninsula of Michigan. Very warm air surged in ahead of this system. Temperatures reached the upper twenties in Celsius (approximately ) across much of southern Ontario, in addition to high dew point levels. An unstable atmosphere (surface based lifted indices around minus 6) was the byproduct of this. Directional wind shear was also present in the warm sector of the storm, in addition to high helicity values and a vorticity maximum approaching the lower lakes. The situation was worsened by the presence of copious amounts of moisture, which would allow any storms that could form to become severe rather quickly. Also, this was supportive of the HP (high-precipitation) counterpart of the supercell thunderstorm (Verkaik, 1997). All of this added up to the distinct possibility of severe rotating storms which would be messy, hard to see, and extremely dangerous. What was needed now was a trigger, and that came in the form of a trailing cold front behind the low. Severe thunderstorms and isolated tornadoes had already raked parts of the Midwestern United States (particularly in Iowa and Wisconsin) the day before on May 30, associated with this same cold front (Grazulis, 1990). The day started off on an active note with the warm front moving northwards. A possible tornado was reported near Leamington, accompanied by golfball-size hail from widespread severe thunderstorm activity in southwestern Ontario. Following the warm frontal passage, skies cleared rapidly and temperatures quickly began to rise. The cold front began crossing Lake Huron towards the noon hour, and with it several thunderstorms developed shortly after 1:30pm EDT, with the northernmost cell soon becoming most dominant. Environment Canada issued a severe thunderstorm warning at 2:25pm for Bruce County (complementing the special weather statement issued early that morning). At around 2:50pm, an F2 tornado touched down briefly in the Lion's Head area (north of Wiarton) before moving out over Georgian Bay and dissipating. At daybreak on May 31, 1985, a strong area of low pressure was centered near Duluth, Minnesota. A cold front extended south from the low across the western Great Lakes and then through Illinois and Missouri. The low tracked across the northern Great Lakes during the afternoon, while the cold front progressed eastward across Indiana and western Ohio. By late afternoon, temperatures had reached at Cleveland, 82 degrees at Youngstown, and at Erie, Pennsylvania. At the same time, conditions in the upper atmosphere continued to become more favorable for an outbreak of severe weather. By early afternoon, thunderstorms developed in Ontario, Canada, just ahead of the cold front. Despite a forecast for severe thunderstorms, though, the sun shone relentlessly for most of that Friday because of a fourth element: a stable air mass at about 2,000 feet above ground level, which served as a "lid" on the brew beneath. Then, at 2:50 p.m., the "lid" moved, and huge cumulonimbus clouds, anvil-topped thunderheads, appeared seemingly out of nowhere all along the Ohio-Pennsylvania border. The storms quickly grew into powerful tornadic supercells. ==Confirmed tornadoes==

} at this location. The fatalities occurred at Centerville. Newton Falls–Niles, Ohio/Wheatland–Hermitage, Pennsylvania This violent tornado began in eastern Ohio and tore directly through the towns of Niles, Ohio, and Wheatland, Pennsylvania, producing F5 damage at both locations. The tornado killed 18 people, injured 310 others, and was the most violent and deadly of the 44 recorded that day. Registering F5 on the Fujita scale, it remains the easternmost recorded F5/EF5 tornado in the United States (as of 2025), the only F5 in Pennsylvania history, the last F5 in Ohio to date, and was also the most violent tornado reported in the United States in 1985. It first touched down in Ohio near the Ravenna Arsenal in Portage County around 6:30 PM EDT. Gathering strength, it moved quickly into Newton Falls in Trumbull County causing F3 to F4 damage through much of the town. While nearly 400 homes were heavily damaged or destroyed, no fatalities were recorded in Newton Falls, due to the storm-readiness of local authorities and its tornado siren. Additional homes were completely destroyed as the tornado struck the north side of Lordstown. Continuing east, the tornado reached F5 intensity as it tore through the north side of Niles. Hundreds of homes in the Niles area were destroyed, including several homes with anchor bolts that were swept away with the debris scattered downwind. The Niles Park Plaza shopping center was completely leveled and partially swept away at F5 intensity, with several of the fatalities occurring at that location. Steel girders were buckled at the shopping center, and a nearby retirement home and a skating rink were leveled as well. As the tornado struck an industrial area in Niles, large tall metal petroleum storage tanks (each weighing ) were torn from where they were anchored and thrown, some of which were tossed or bounced considerable distances. One of the tanks was found in the middle of a road, from where it originated. The tornado weakened slightly as it tore through the north side of Hubbard and through the center of Coalburg, though many additional homes were still leveled in those areas. As the tornado crossed the state line and reached Wheatland, Pennsylvania, it was a half-mile (0.8 km) wide and had regained F5 strength. A steel-frame trucking plant in Wheatland was obliterated and partially swept away at F5 intensity, as the building's steel girder frame was mangled into a pile and pushed off of the foundation. At nearby Wheatland Sheet and Tube, sections of pavement were scoured from the parking lot, and shards of sheet metal and routing slips were left wedged beneath the remaining asphalt. Ninety-five percent of Wheatland's business and residential area were destroyed. According to Storm Data from the National Weather Service, the destruction of the town "resembled that of a bombed-out battle field." Continuing east, the tornado weakened slightly but remained violent as it struck Hermitage, damaging or destroying 71 homes along with the town's airport, destroying several hangars and planes. A wing from one of the planes was found away in Mercer. Another trucking steel processing plant was heavily damaged in Hermitage as well. The tornado then destroyed 15 homes and damaged 30 others in the Greenfield area before finally dissipating. In Ohio, it was the deadliest tornado since the Xenia F5 during the Super Outbreak of April 3, 1974. The tornado was also captured on camera by several residents. ==Storm timeline and aftermath==

The outbreak lasted roughly from just before 2 p.m. EDT, when the first tornado touched down in Wiarton, Ontario, until just after 12 a.m. EDT when the last reported tornado struck Tobyhanna, Pennsylvania. The peak of the outbreak took place during the early evening hours where the strongest and deadliest tornadoes formed across western Pennsylvania and eastern Ohio. The first of two F4 tornadoes to affect Erie County touched down just west of the Pennsylvania state line around 5 p.m. The tornado moved across the northwestern tip of Crawford County and then entered Erie County near Pennside. After causing considerable damage there, the tornado slammed into Albion leveling the town. A ten-block area was completely destroyed, with nine people being killed. The tornado killed three more people in Cranesville before lifting. There were also 82 injuries, and a total of 309 destroyed buildings. The second F4 to affect Erie County touched down between Wattsburg and Corry in eastern Erie County. It clipped the northwestern tip of Warren County, before crossing into New York, where it did some damage in Chautauqua County, before dissipating near Panama. The tornado stayed on the ground for , but resulted in no fatalities. The most famous tornado of this outbreak touched down in Portage County, Ohio, near the Ravenna National Guard Armory at about 6:30 p.m. and cut a path through Newton Falls, Niles, and Hubbard, Ohio, before entering Pennsylvania. This was the only F5 in the United States in 1985, and the deadliest Ohio tornado since the Xenia F5 during the 1974 Super Outbreak. The outbreak took the lives of 90 people in the United States and Canada, the highest number of fatalities for an outbreak since the 1974 Super Outbreak and a mark that stood until the 2011 Super Outbreak. Other U.S. tornadoes Described as "one of the most impressive tornadic events of the 20th century" by meteorologist and researcher Thomas Grazulis, a massive, high-end F4 tornado tracked for through dense forest in central Pennsylvania. Near the beginning of its path, a few homes were heavily damaged and some outbuildings were destroyed, but otherwise, the tornado passed entirely through uninhabited areas in the Moshannon and Sproul State Forests. Surveyors estimated the damage path to be at least , The second-deadliest tornado in Pennsylvania history touched down in Trumbull County, Ohio, just yards away from the Pennsylvania state line, and tracked for through northwestern Pennsylvania. Rated F4, the tornado struck Jamestown in northwestern Mercer County, Atlantic and Cochranton in southern Crawford County, and Cooperstown in northern Venango County, narrowly missing Oil City to the north before dissipating south of Tionesta in western Forest County. Despite being rebuilt in 1987, business never recovered at the shopping plaza, which sits vacant today. In North Sewickley Township, the tornado struck the junction of PA 65 and PA 588, destroying the Spotlight 88 Drive-In Theater, a gas station, three homes and two other businesses. In Butler County, the tornado crossed Interstate 79, where it blew a southbound van a quarter of a mile (400 m) off the highway. The family of four inside the van was ejected, but survived. A trailer park near Evans City was destroyed, as was another trailer on Watters Station Road, where two people were killed. Near Callery, 40 homes were destroyed. People in the area reported pieces of sheet metal and shreds of pink insulation falling from the sky shortly before the tornado arrived. Near the end of its path, the tornado killed a babysitter and a young girl near Saxonburg, before dissipating near Sarver. In all, this tornado killed nine people, injured 120, and caused more than $10,000,000 of damage in Beaver County. Three tornadoes were reported in New York: two in Chautauqua County, and one in St. Lawrence County. The first tornado, rated F4, crossed into New York from Erie County, Pennsylvania, and tracked for ( in Pennsylvania, in New York), striking Clymer and Harmony in southwestern Chautauqua County before dissipating. The second tornado, rated F3, touched down in southeastern Chautauqua County and tracked for , striking Kiantone, Carroll and Poland, and narrowly missing Jamestown to the east. The third tornado, rated F1, touched down in northern St. Lawrence County, and was produced by a supercell that crossed into the North Country from Ontario. This tornado tracked for five miles, passing north of Norfolk. In all, 65 people were killed in Pennsylvania, which remains the highest death toll in a tornado outbreak in Pennsylvania history. == Canada ==

Most of the tornadic activity at this point moved into southern Ontario producing more tornadoes (some of which were significant). These tornadoes formed around the Highway 7 corridor between Lindsay to Madoc (Joe and Leduc, 1993) near the towns of Wagner Lake (F1 at 5:40 pm), Reaboro (F1 at 6:05 pm), Ida (F2 at 6:20 pm), Rice Lake (F3 at 6:25 pm), and Minto (F1 at 6:35 pm). Most of these tornadoes had conversely shorter paths than the earlier tornadoes, likely as a result of the parent thunderstorms beginning to weaken. In addition, they did not receive as much media attention as the previous tornadoes (those earlier storms were grouped collectively by the media as comprising "The Barrie Tornado"), probably a result of the fact that they didn't have the opportunity to cause as much damage. It stayed over rural areas for most of its path, however a few homes (especially in the Terra Nova and Mansfield area) sustained F3 damage. It has been disputed whether this path was of two separate tornadoes or just one. Shortly after this tornado dissipated, there were hints of another brief touchdown near Angus in the Blackdown Park training area of Canadian Forces Base Borden (north of Alliston). The next tornado was the last of this storm, but was the most infamous one. It formed in southern Simcoe County (Essa Township), less than southwest of Highway 400 and the Barrie city limits. At approximately 4:00 pm, all electrical power in Barrie went out, as the Grand Valley/Tottenham tornado took out the main hydro transformers, southwest of the city (LeGrand, 1990). Few residents were aware of the tornado, but many people were let off work 30–45 minutes before the storm hit due to these power outages. Had this not happened, the death toll would have been higher. The intensifying tornado first obliterated a pine tree forest plantation. Some high trees were snapped at the level. At this point the damage path was about wide, moving steadily towards the east-northeast. It then entered the southern part of Barrie shortly before 5:00 pm. Visibility was very low as the tornado was cloaked in heavy rain and dust. Extensive F3 and localized F4 damage occurred to an entire square block of homes in the Crawford Street and Patterson Road subdivision. Five people were killed in the area as some homes there were not well-built, and thus collapsed after being pushed off their foundations. The Grand Valley–Tottenham supercell The storm which had initially developed east of Clinton produced a new tornado a couple kilometres north of Arthur by 4:15 pm. Many power lines and hydro towers were destroyed early in its lifetime (including those used to deliver electricity from the Bruce Nuclear Generating Station to northern and western parts of the Greater Toronto Area). The tornado quickly widened, intensified and reached violent proportions by the time it reached the small crossroads community of Grand Valley just before 4:30pm. In more recent years this theory has proved to be incorrect; it is likely that this supercell was also a cyclic one. ==Aftermath==

Following the event, ninety people were dead and 281 were injured, as close to a thousand businesses and homes were wiped out (Grazulis, 2001). Still, hundreds more were left out of work largely as a result of the massive damage sustained to the industrial complex in Barrie. Of the 605 homes in the path of these tornadoes, approximately one-third were rendered uninhabitable. One of the more sobering instances was that of a blind Orangeville-area man whose home suffered a similar fate, following a painstaking 20 years of construction (LeGrand, 1990). Nevertheless, in the hours following the event, soldiers from "B" and "F" Companies, The Grey and Simcoe Foresters and from Canadian Forces Base in Borden assembled in Barrie to assist in the canvassing of the worst affected areas of the city. Coincidentally, the latter had barely escaped a tornado itself that day, it having momentarily touched down in the Blackdown Park Training Area before lifting again and passing over hundreds of married quarters. In addition, the Grand Valley library (levelled by an F4 tornado) donated books, and wooden pallets were donated by a local trucking company in Barrie so survivors could salvage their possessions. Most of Grand Valley was completely rebuilt by August 1986, a little over a year later. The textile plant, Albarrie (one of twelve factories completely destroyed by the Barrie tornado) opened its doors once again within the next year. Even so, to this day there are still hints from the past of the tornadoes that day. Some of the wooded areas affected are still a twisted mess, and some random debris still remains scattered in the bush to the east of Highway 400 in Barrie. In the end, the price tag from the severe weather in Ontario alone reached an estimated $200 million (in unadjusted Canadian dollars, 1985). Correlating to nearly $390 million in Canadian dollars by today's standard, it was a very expensive disaster indeed (LeGrand, 1990). This tornado outbreak ranks among the Southern Ontario tornado outbreak of 2005 and the 1998 Ice Storm as one of the most costly weather disasters to strike Ontario. Climatologists have estimated that the probability of a severe weather outbreak as widespread and catastrophic as this one, occurring this far north and east in North America once again is one in 75,000 (Grazulis, 2001). On the evening of May 31, 1985, an F1 tornado touched down far to the east of the other twisters from that day at around 8:10 p.m., near Grippen Lake, about northeast of Kingston, Ontario. This makes it a "14th lost and found tornado". == See also ==