Above normal moisture laying across Central New York combined with an area of low pressure moving over Lake Ontario to produce numerous rounds of heavy rain producing thunderstorms during the afternoon. Weak frontal boundaries associated with the low pressure focused storms primarily over the Finger Lakes region where flash flooding was severe.

Flash Flood in CORTLAND, NEW YORK
From 17-AUG-21 20:56:00 to 17-AUG-21 23:45:00 (EST-5)
Location: TRUXTON
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: State Official

Street flooding was reported in Truxton. There were several areas of mud and debris deposited on roads, bridges and blocking culverts.

Flash Flood in CAYUGA, NEW YORK
From 17-AUG-21 18:55:00 to 17-AUG-21 20:15:00 (EST-5)
Location: MERRIFIELD
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Flooding occurring over State road NY-34 to the north of the Scipio Fire Department.

Flash Flood in CAYUGA, NEW YORK
From 17-AUG-21 18:55:00 to 17-AUG-21 20:30:00 (EST-5)
Location: WYCKOFF
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Flooding occurring in the Town of Owasco near NY-38A and Rockefeller Road.

Flash Flood in CAYUGA, NEW YORK
From 17-AUG-21 19:00:00 to 17-AUG-21 20:30:00 (EST-5)
Location: NILES
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

There was widespread small stream and creek flooding, along with street flooding, reported in Niles.

Flash Flood in CAYUGA, NEW YORK
From 17-AUG-21 19:15:00 to 17-AUG-21 20:15:00 (EST-5)
Location: NILES
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotters reported road flooding near Split Rock Road and NY-38a.

Flash Flood in ONONDAGA, NEW YORK
From 17-AUG-21 19:28:00 to 17-AUG-21 20:15:00 (EST-5)
Location: SKANEATELES
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: State Official

Multiple roadways were reported to have water rushing over them from Skaneateles and points east along U.S. Route 20.

Flash Flood in ONONDAGA, NEW YORK
From 17-AUG-21 19:45:00 to 17-AUG-21 20:15:00 (EST-5)
Location: EAST SYRACUSE
Flood cause: Heavy Rain
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Serious urban flooding was reported from East Syracuse across the southern sections of the City of Syracuse and portions of Onondaga county.

Flash Flood in CORTLAND, NEW YORK
From 17-AUG-21 20:14:00 to 17-AUG-21 23:45:00 (EST-5)
Location: PREBLE
Flood cause: Heavy Rain
Property damage: 15.00K
Crop damage: 0.00K
Reported by: State Official

Multiple roads are flooded in Preble.

Flash Flood in CORTLAND, NEW YORK
From 17-AUG-21 21:27:00 to 17-AUG-21 23:45:00 (EST-5)
Location: LITTLE YORK
Flood cause: Heavy Rain
Property damage: 20.00K
Crop damage: 0.00K
Reported by: State Official

A neighborhood of manufactured homes was flooded in this area.

Flash Flood in CORTLAND, NEW YORK
From 17-AUG-21 21:31:00 to 17-AUG-21 23:45:00 (EST-5)
Location: SCOTT
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: State Official

Officials reported street flooding and trees down and across roads in the area.