However, the heaviest and most destructive flash flooding was concentrated around northern New England, especially Vermont and New York as widespread rain amounts of 6 inches (150 mm) fell in the two states on July 9–11.

Additionally, downtown Montpelier, Vermont was flooded, along with numerous state roads being closed as a result of it; the highest rainfall total from the event was centered in Putnam Valley, New York, with 10.49 inches (266 mm).

Transportation service was impacted by the heavy rainfall and flooding, including Amtrak in New York and Vermont and Boston's MBTA subway.

[2] Flash flooding occurred again on July 16 following slow-moving showers and thunderstorms which developed along a cold front, which moved parallel to a deep southwesterly flow, causing the slow motion.

[3] On July 21, additional flash flooding occurred after a combination of a strong convergence zone and strengthening instability led to heavy rainfall-producing thunderstorms across portions of New England.

[24] The flooding also led to a crash on New York State Route 27 late Sunday morning, injuring a police officer,[25] with small parts highway shutting.

[31][32] The following day, the Weather Prediction Center issued their first ever high risk for flash flooding in the NWS Burlington coverage zone.

[34][35] Additionally, numerous businesses and homes were destroyed after flooding left them uninhabitable and unable to operate; this included a United States Postal Service building in the city's downtown area which did not open until 15 months later.

[44][45][46] Additionally, the West River at times crested to flood levels, which in turn affected both towns; the damage resulting from there overall and the state itself was described by officials as "worse than Hurricane Irene".

[67][68][69] Additional heavy rains fell on July 16, producing more flooding across the state which forced more road closures and damaged infrastructures.

A tornado watch was issued by the National Weather Service for the entire state a day prior, which concerned the storms that would later produce the later heavy rainfall.

[84][85] Widespread tree and power line damage occurred in several towns including Chaplin, Naugatuck, Scotland, and Windham.

[87] Several more rounds of thunderstorms developed on July 29; a tornado warning was issued for Tolland and Windham counties, and a funnel cloud was reported in Storrs.

[90][91] A flash flood watch was issued for western portions of the state on July 9, where a moderate risk of excessive rainfall was in place by the Weather Prediction Center's outlook.

[93] In North Adams, heavy rainfall flooded twenty city roads, including Massachusetts Route 8, where a sinkhole also occurred as a result.

[101] As a result of heavy rainfall, flooding caused vehicles to be stranded in an underpass on U.S. Route 20 in Worcester, and emergency crews pumped out floodwaters from several inundated basements in Fitchburg.

[103] Heavy rainfall led to a sewer discharge into a portion of the Boston Harbor, prompting a public health emergency there and warning people to avoid contact with the affected waters for 48 hours.

[109] Additionally, an EF0 tornado was initiated by a squall line in North Brookfield that was part of the system that produced flooding across the state, causing only minor tree damage.

A baseball game between the Boston Red Sox and New York Mets was suspended in the fourth inning as a result of the exceptionally heavy rain that sent water cascading down stairs at Fenway Park.

[116] Heavy rainfall also led to 9,000,000 US gallons (34,000 m3) of sewage water, with some of it untreated, flowing into the Charles River and affecting the Alewife Brook Reservation nearby.

[123][124] In Greater Boston, numerous roads were flooded, including Beacon Street and Storrow Drive in Brookline; Morrissey Boulevard in Dorchester; and Commonwealth Avenue.

[146] In recovery efforts, Rhode Island State Police assisted with stalled vehicles, while snowplows were deployed in Providence to push out floodwaters from roadways.

[155][156][157] In Montgomery County, a portion of eastbound Pennsylvania Turnpike was shut down after debris blocking nearby storm drains caused flooding on the interstate.

[158][162] In Conshohocken, Upper Merion Township, and parts of Berks County, floodwaters inundated and stranded several vehicles; downed wires also occurred in the former two locations.

[163] On July 15, a thunderstorm produced heavy rainfall in Upper Makefield Township in Bucks County, causing flash flooding.

[168] More heavy rains fell on July 16, prompting an MLB game between the Philadelphia Phillies and San Diego Padres to be delayed.

[note 1][171] All 21 counties in the state were under a flood watch on July 9, as much of New Jersey was included in a moderate risk of excessive rainfall from an outlook released by the Weather Prediction Center.

[183][184] The route was not reopened until July 30 as drainage areas were fixed and improved following the flooding and 5,000,000 pounds (2,300,000 kg) of debris was cleaned up after it was strewn across the roadway, which left parts of the highway extensively damaged.

[198][199] The American Red Cross opened a shelter to assist displaced people and as a center for needed supplies in Highland Falls, New York.

[203] On July 11, New Hampshire governor Chris Sununu toured and surveyed flood-damaged areas, including the failed Forest Lake Dam.