September 2023 northeastern U.S. floods

A Day 1 excessive rain outlook issued at 12:00 PM EDT, highlighting a slight risk across the Northeastern United States

Streets and numerous homes were flooded in the city of Leominster, and the downtown area there was also flooded, where buildings were flooded and a few partially collapsed.[7][8] A sinkhole also opened near a Cadillac car dealership, damaging vehicles there.[9] Massachusetts governor Maura Healey described the flooding "catastrophic", and a flash flood emergency was issued for Leominster and Fitchburg.[10][11] Residential areas in neighborhoods near Leominster were asked to immediately evacuated as concerns were raised over the Barrett Park Pond Dam, which was compromised and was already in poor condition.[12][13] Homes near Route 117 near Fall Brook, a neighborhood of Leominster, were "significantly damaged".[12] School buildings near Leominster also suffered damage, and more than 15 roads, including portions of the Massachusetts Turnpike (I-90), Route 13 and Route 2, were closed due to flooding and road damage.[1][14][15][16] At least 9.5 inches (240 mm) of rain fell in several hours in Leominster, and an evacuation order was also issued for low-lying areas near Fall Brook and the North Nashua River.[14][17] Several minor injuries also occurred, as many vehicles were submerged in floodwaters.[14][18] MBTA Commuter Rail service was also affected, with trains and buses being terminated, diverted, or originating at a different station, including trains along the Fitchburg Line.[19] Leominster mayor Dean Mazzarella stated, "Find a high spot somewhere. Find a high spot and stay there until this is over.", and also claimed that at least 11 inches (280 mm) of rain fell.[8][3] More than $40 million in damages occurred to city infastructure.[20]

Flood damage also occurred in North Attleborough, where 200 homes were flooded, including basements,[21] and vehicles were submerged.[22][23] Several roads were closed,[24] and the emergency operations center was activated there.[22] Two Boston Red Sox games were postponed due to the rainfall.[25] Nearly 2,400 power outages occurred across the state.[19] A tornado warning was also issued for Bristol, Norfolk, and Plymouth counties after the storm which prompted the warning in Rhode Island moved into southern portions of the state.[26]

On September 13, streets were flooded in West Hartford, submerging a car,[27] as a flash flood warning was issued for Hartford.[2][28] Roads were also flooded in Farmington, prompting law enforcement to place signs and barricades across the flooded area.[29] At least eight people were rescued in Danbury as cars were submerged in floodwaters.[30] Route 317 was closed near Roxbury, and a Holiday Inn hotel was damaged by floods.[30] Flash flood warnings were issued for several counties in the state, and a severe thunderstorm warning was issued for the Hartford area as streets and buildings were flooded there.[31][32] Flooding also occurred in Bristol, where flooded roads submerged at least three cars.[33] One of the storms which produced heavy rainfall spawned an EF1 tornado near Danielson, and Killingly, downing trees and causing minor damage to two homes, and a tornado warning was also issued for that area.[34]

An apartment complex consisting of 24 apartments were affected by floods on September 11 in Cranston, where two dogs died and two cats went missing.[35] Flooding impacted a shopping plaza, damaging businesses and prompting 25 people to be rescued from floodwaters.[36] The West River overflowed, forcing a road to close after the roadway was under 4 feet (120 cm) of water.[37] Flooding also occurred in Cumberland, and North Providence.[37] Floods caused delays on the Providence/Stoughton Line.[3] The tornado which impacted areas near Danielson and Killingly, Connecticut crossed the border into Rhode Island, where trees and power lines were down in Foster.[38]

On September 12, a flash flood emergency was issued for the entire Baltimore area as 3–5 in (76–127 mm) of rain fell.[2] Several roads and highways, including portions of the Capital Beltway (I-495) and US 29 were closed due to floodwaters on the roadway, and flooding also stranded drivers on several roads in the city.[2][39] More than 1,500 power outages occurred across the state.[40] Flash flood warnings and a tornado warning was issued for parts of the state as the storms moved through.[41]

More than 1,500 power outages occurred, and a water rescue took place after a woman and her dog were in a submerged vehicle in Perth Amboy.[42][43] Several streets were flooded in Hoboken as a flood watch was in effect for northeastern parts of the state.[44] Before a Monday Night Football game between the New York Jets and Buffalo Bills, a shelter-in-place warning was issued at MetLife Stadium.[45]