Rain developed across the area ahead of an approaching warm front, consolidating into a slow-moving band of heavy rain west of New York City that advanced eastward across southern Connecticut during the afternoon and evening. Precipitable water values increased from 1.84 on the morning sounding from Upton, NY to 2.13 by evening. Both of these values are above the 90th percentile based on a sounding climatology, with the 2.13 precipitable water value on the evening of the 25th a record for the date. Widespread rainfall amounts of 4 inches or more were reported across southern Connecticut with flash flooding resulting in numerous water rescues. A trained spotter in Trubmull received 7.32 inches of rain during the event, while a HAM radio operator in Lebanon received 6.79 inches. Automated stations near Durham and Hamden reported 7.24 and 8.59 inches of rain, respectively.

Flash Flood in NEW HAVEN, CONNECTICUT
From 25-SEP-18 17:40:00 to 25-SEP-18 19:30:00 (EST-5)
Location: AUGERVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

The intersection of Clover Circle and Lane Street was impassable due to flooding in Hamden.

Flash Flood in NEW HAVEN, CONNECTICUT
From 25-SEP-18 18:00:00 to 25-SEP-18 19:30:00 (EST-5)
Location: AUGERVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Dixwell Avenue near the Wilbur Cross Parkway was closed due to flooding in Spring Glen. Several cars were stranded with flood waters up to the rooftops.

Flash Flood in FAIRFIELD, CONNECTICUT
From 25-SEP-18 18:15:00 to 25-SEP-18 18:45:00 (EST-5)
Location: SPORT HILL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Fifteen water rescues for people trapped in their vehicles were performed by the fire department in Bridgeport.

Flash Flood in NEW HAVEN, CONNECTICUT
From 25-SEP-18 18:15:00 to 25-SEP-18 18:15:00 (EST-5)
Location: HIGHWOOD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Morse Street in Hamden was closed due to flooding with one car stranded in flood waters.

Flash Flood in NEW HAVEN, CONNECTICUT
From 25-SEP-18 18:30:00 to 25-SEP-18 19:30:00 (EST-5)
Location: MERIDEN MARKHAM ARPT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Road closures were reported around the town of Meriden due to flooding.

Flash Flood in NEW HAVEN, CONNECTICUT
From 25-SEP-18 19:00:00 to 25-SEP-18 19:30:00 (EST-5)
Location: GUILFORD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Route 146 between the towns of Madison and Guilford was closed due to flooding.

Flash Flood in NEW HAVEN, CONNECTICUT
From 25-SEP-18 19:00:00 to 25-SEP-18 19:30:00 (EST-5)
Location: ANSONIA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Crescent Street in Ansonia caved in due to flood waters.

Flash Flood in MIDDLESEX, CONNECTICUT
From 25-SEP-18 19:15:00 to 25-SEP-18 20:08:00 (EST-5)
Location: SOUTH FARMS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Route 155 was closed between Lee Street and Millbrook road in Middletown due to flood waters.

Flash Flood in NEW LONDON, CONNECTICUT
From 25-SEP-18 19:32:00 to 25-SEP-18 21:20:00 (EST-5)
Location: COLCHESTER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Route 16 near Linwood Cemetery was closed due to flooding in Colchester.

Flash Flood in NEW LONDON, CONNECTICUT
From 25-SEP-18 19:32:00 to 25-SEP-18 21:20:00 (EST-5)
Location: LEBANON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Several roads were closed due to flooding in Lebanon, with basements reported flooded on Goshen Heights Road and Watermand Road.

Flash Flood in MIDDLESEX, CONNECTICUT
From 25-SEP-18 19:38:00 to 25-SEP-18 20:08:00 (EST-5)
Location: CHESTER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

The Liberty Street bridge in Chester was washed out due to flash flooding.

Flash Flood in MIDDLESEX, CONNECTICUT
From 25-SEP-18 19:38:00 to 25-SEP-18 20:08:00 (EST-5)
Location: MOODUS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

The Neptune Avenue bridge in East Haddam was washed out due to flash flooding.

Flash Flood in NEW LONDON, CONNECTICUT
From 25-SEP-18 20:05:00 to 25-SEP-18 21:20:00 (EST-5)
Location: LEBANON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A car was stuck in flood waters on Santa Anna Road in Lebanon.

Flash Flood in NEW LONDON, CONNECTICUT
From 25-SEP-18 20:10:00 to 25-SEP-18 21:20:00 (EST-5)
Location: NORTH FRANKLIN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A car was stranded in flood waters on Pond Road in Franklin.

Flash Flood in NEW LONDON, CONNECTICUT
From 25-SEP-18 20:30:00 to 25-SEP-18 21:20:00 (EST-5)
Location: CHESTNUT HILL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

The Lebanon Fire Department made multiple water rescues of occupants stuck in vehicles in flood waters.

Flash Flood in NEW LONDON, CONNECTICUT
From 25-SEP-18 20:50:00 to 25-SEP-18 21:20:00 (EST-5)
Location: LEBANON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A section of Route 207 was flooded and impassable in Lebanon. In addition, a car was stuck in flood waters at the intersection of Smith Road and Goshen Hill Road.

Flash Flood in FAIRFIELD, CONNECTICUT
From 25-SEP-18 14:45:00 to 25-SEP-18 18:45:00 (EST-5)
Location: COS COB
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Both Shady Brook Lane and Midbrook Lane were impassable with up to two feet of water in Old Greenwich.

Flash Flood in NEW HAVEN, CONNECTICUT
From 25-SEP-18 19:00:00 to 25-SEP-18 19:30:00 (EST-5)
Location: ANSONIA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

There were multiple road closures across the town of Ansonia due to flood waters.

Flash Flood in MIDDLESEX, CONNECTICUT
From 25-SEP-18 19:38:00 to 25-SEP-18 20:08:00 (EST-5)
Location: EAST HADDAM ARPT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Significant damage to the Goodspeed Musical rehearsal studio and parking lot on Norwich Road in East Haddam due to flash flooding.

Flash Flood in NEW HAVEN, CONNECTICUT
From 25-SEP-18 21:30:00 to 25-SEP-18 23:00:00 (EST-5)
Location: WALLINGFORD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The Quinnipiac River at Wallingford rose above its minor flood stage of 10.0 feet at 10:30pm EDT, crested at a height of 10.09 feet at 11:15pm EDT, and fell back below flood stage at 12:00am EDT on September 26th.

Flood in NEW LONDON, CONNECTICUT
From 25-SEP-18 23:00:00 to 26-SEP-18 14:30:00 (EST-5)
Location: GIBBS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The Yantic River at Yantic rose above its flood stage of 9.0 feet at 12:00am EDT September 26th. It continued to rise and exceeded its moderate flood stage of 9.5 feet at 12:15am EDT and then its major flood stage of 11.0 feet at 1:00am EDT before cresting at a height of 12.53 feet at 2:45am EDT. This marks the sixth highest crest ever on the river at this location. The river fell back below flood stage at 3:30pm EDT on the 26th.

Flash Flood in FAIRFIELD, CONNECTICUT
From 25-SEP-18 14:20:00 to 25-SEP-18 18:45:00 (EST-5)
Location: COS COB
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Several streets flooded in Old Greenwich including Lockwood Avenue, Sound Beach Avenue, and Benjamin Street with at least two feet of standing water making roads impassable.

Flash Flood in FAIRFIELD, CONNECTICUT
From 25-SEP-18 14:25:00 to 25-SEP-18 18:45:00 (EST-5)
Location: GREENWICH
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Running mud and water over halfway up car tires at the intersection of Davis Avenue and Bruce Park Drive in Old Greenwich.

Flash Flood in FAIRFIELD, CONNECTICUT
From 25-SEP-18 14:30:00 to 25-SEP-18 18:45:00 (EST-5)
Location: STAMFORD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

A school bus with 31 children was stranded on Dale Street in Stamford due to flooding and had to be rescued.

Flash Flood in FAIRFIELD, CONNECTICUT
From 25-SEP-18 14:45:00 to 25-SEP-18 18:45:00 (EST-5)
Location: COS COB
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wesskum Wood Road at Sound Beach Avenue and Harding Road at Laddins Rock Road were closed in Old Greenwich due to continued flooding.

Flash Flood in FAIRFIELD, CONNECTICUT
From 25-SEP-18 15:30:00 to 25-SEP-18 18:45:00 (EST-5)
Location: HARBORVIEW
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Severe street flooding was reported at the intersection of Meadow Street and Wilson Avenue in South Norwalk with a car stranded and submerged halfway.

Flash Flood in FAIRFIELD, CONNECTICUT
From 25-SEP-18 15:30:00 to 25-SEP-18 18:45:00 (EST-5)
Location: EAST NORWALK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

I-95 was closed southbound at Exit 16 (East Avenue) in East Norwalk due to flooding. A car was stuck in the water with police on the scene.

Flash Flood in FAIRFIELD, CONNECTICUT
From 25-SEP-18 16:15:00 to 25-SEP-18 18:45:00 (EST-5)
Location: SPORT HILL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

The Horse Haven Brook was over its banks and flooding the area of Park Avenue and Brion Drive in Toilsome Hill. Multiple cars were submerged in several feet of flowing flood waters.

Flash Flood in FAIRFIELD, CONNECTICUT
From 25-SEP-18 16:49:00 to 25-SEP-18 18:45:00 (EST-5)
Location: SPORT HILL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous people were trapped in vehicles on Bennett Street in Fairfield due to flood waters.

Flash Flood in FAIRFIELD, CONNECTICUT
From 25-SEP-18 17:00:00 to 25-SEP-18 18:45:00 (EST-5)
Location: UPPER STEPNEY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Fifty water rescues were performed by the local fire department and emergency management in Easton.

Flash Flood in NEW HAVEN, CONNECTICUT
From 25-SEP-18 17:15:00 to 25-SEP-18 18:15:00 (EST-5)
Location: ANSONIA ARPT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Numerous roads were closed due to flooding around the town of Orange including Route 34 (Derby Avenue) at Route 114, Glenbrook Road, Mapledale Road, Chestnut Ridge Road, Edison Road, Grassy Hill Road, Opekun Road, and Arrowhead Road.

Flash Flood in FAIRFIELD, CONNECTICUT
From 25-SEP-18 17:30:00 to 25-SEP-18 18:45:00 (EST-5)
Location: GREENFIELD HILL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Firefighters rescued a mother and child from a flooded car at the intersection of Brookside Drive and Samp Mortar Drive in Fairfield.

Flash Flood in MIDDLESEX, CONNECTICUT
From 25-SEP-18 17:40:00 to 25-SEP-18 20:08:00 (EST-5)
Location: MIDDLETOWN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

All lanes were closed on Route 9 southbound between Exit 16 and Exit 1 in Middletown due to flooding.