Source: PSU NARR.Īs this was occurring, an elevated mixed layer, shown as crucial by Banacos and Ekster 2010 to northeastern United States severe weather events, was being advected over the area in the mid levels. This provided the strong deep layer shear necessary for organized severe storms. A strong and progressive upper level trough tracked from the northern Plains towards the Great Lakes during the morning and afternoon hours, bringing a jet streak of over 70 knots at 500 mb. Meteorologically, despite the location of the event, all of the classic ingredients required for a high-end severe weather event were in place in abundance on May 31. Visible satellite loop from GOES-6 of the outbreak. It is also one of the only known North American tornado events to produce significant tornadoes in both the United States and Canada on the same day, making it a truly “international” event.
At this longitude in North America, only two tornado events have led to a comparable or greater number of deaths in at least the last 125 years the Worcester, Massachusetts tornado on Jand the Appalachians tornado outbreak on June 23, 1944. The count of violent F4/F5 tornadoes it produced outnumbers all but four tornado events since 1950, and its death toll exceeds everything else in the period between the two massive outbreaks of April, 1974 and April, 2011. The outbreak is staggering in many ways in addition to its unusual geographic location. Northeastern Ohio, western Pennsylvania, Upstate New York and Ontario, Canada are generally not the first places you would think of when hearing the phrase “major tornado outbreak.” However, on the final day of May in 1985, residents of this region suffered one of the most intense tornado events in North American history, as a powerful storm system brought destruction from the skies in a manner unprecedented this far east on the continent.
Deadly F5 tornado moving through Niles, Ohio.
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