A destructive series of tornadoes in damage struck the Northeastern United States on Monday July 10, 1989.

The storm system affected five states with severe weather, including hail up to 2.5 inches (6.4 cm) across, thunderstorm winds up to 90 mph (140 km/h), and 17 tornadoes.

A large section of Hamden, Connecticut, including an industrial park and hundreds of homes, was destroyed, and in some places, buildings were flattened to the ground.

[4] An hour after the previous event destroyed in Upstate New York, a new tornado family began producing significant damage in the adjacent state of Connecticut.

[5] The tornado continued south-southeast through Milton, leveling hundreds more trees, and destroyed the village of Bantam before dissipating.

[2][6] Soon afterwards, another tornado touched down in Watertown, passing through Oakville and northern Waterbury, damaging or destroying 150 homes.

[4] The storm was so intense at this point that an 80 mph (130 km/h) wind gust was measured in downtown New Haven after the tornado dissipated.

[6] At about the same time, a tornado struck the area between Carmel and Brewster, New York, unroofing a condominium complex.

Moving east-southeast into southern Middlesex County, it continued producing severe winds (gusting up to 90 mph; 140 km/h) and hefty rain.

The storm then weakened but still managed to produce 60 mph (97 km/h) winds on Cape Cod before finally moving out into the Atlantic and dissipating.

Two F0s and an F1 tracked through parts of Passaic and Bergen counties, snapping and uprooting trees, and causing $4 million in damage.

[6] In Waterbury, Connecticut, Mayor Joseph Santopietro declared a state of emergency due to extensive damage in the city.

[6] In Hamden, Connecticut, the National Guard was called in to aid in cleanup and keep order, as some looting was reported in the devastated area.

[10][11] Despite the extensive and widespread damage, only one death was reported from the entire severe weather outbreak, and this was due to straight-line winds, not a tornado.