The severe weather event spawned a total of 33 tornadoes in nine states from New York to South Carolina and caused an estimated $40 million in damage, 77 injuries and 2 fatalities.

[1] On June 2, the Storm Prediction Center outlined a Moderate risk of severe weather across a large portion of the Mid-Atlantic and Northeastern United States regions, allowing a series of shortwave troughs to undercut the vortex across the northern half of the country.

[3] This feature enhanced a low-level convergence zone and surface barometric pressure falls associated with a lee trough east of the Appalachian Mountains, and generally contributed to widespread favorable wind profiles conducive for supercells.

[4] Storms first developed across portions of Ontario southward into Ohio,[5] and scattered supercells evolved across southern New York, Pennsylvania, the Delmarva region, and North Carolina over subsequent hours as the cold front continued eastward.

[38] The tornado first touched down at 9:00 p.m. EDT (01:00 UTC) in extreme eastern Fayette County, Pennsylvania, where it only sheared or uprooted trees.

[37] As the tornado crossed into Allegany County, it acquired multiple-vortex characteristics and reached violent F4 intensity with winds up to 210 miles per hour (340 km/h), the highest on record in Maryland.

[38] Structures in this area were particularly susceptible to the tornado, as Frostburg resides on the Allegheny Plateau at an elevation around 2,000 ft (610 m) and thus faced full exposure to tornadic winds.

An adjacent farm vehicle, pickup truck, and storage shed stopped the structure from rolling down a nearby steep hill.

[45] The tornado continued into Wyoming County and affected structures along a small hill, causing minor damage to their siding and roofs.

One of the houses was reduced to its bare foundation and a portion of its back wall In total, 42 homes around this area were significantly damaged or demolished.

[46] The tornado moved into Lackawanna County, where it struck the campus of Keystone Junior College, blowing out windows and twisting gutters.