Though the primary west to east oriented frontal boundary with upper 60s to low 70s dewpoints streaming into it remained south across Ohio and Pennsylvania, a deepening low pressure system crossing New York State and a very moist air mass resulted in a dynamic moisture-laden system dropping heavy rain from the Southern Tier through Oswego County. The rainfall intensity was also enhanced by a mesolow that moved through simultaneously. Overall, multiple locations saw rainfall totals over 3 inches in less than 12 hours. Numerous road closures occurred during the event including both directions of the Thruway near Rochester. The flooding was so extensive that a State of Emergency was declared for the entire county on Thursday afternoon. Many flash flood and areal flood warnings were issued during this event and some of these persisted well into Friday morning.

Flash Flood in MONROE, NEW YORK
From 20-JUN-19 09:45:00 to 20-JUN-19 10:45:00 (EST-5)
Location: RUSH
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Public

Flooding was reported near the intersection of Route 251 and 15A, closing both roads. Moving water was high enough to approach some home foundations.

Flash Flood in ONTARIO, NEW YORK
From 20-JUN-19 10:55:00 to 20-JUN-19 11:15:00 (EST-5)
Location: BROWNSVILLE
Flood cause: Heavy Rain
Property damage: 20.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A portion of Gillis Road was washed out by flood water.

Flash Flood in OSWEGO, NEW YORK
From 20-JUN-19 11:00:00 to 20-JUN-19 13:00:00 (EST-5)
Location: LANSING
Flood cause: Heavy Rain
Property damage: 300.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Multiple roads, homes, and businesses were reported flooded. Water was up to the roofs of cars in the high school parking lot. The emergency manager stated it was the worst flooding ever seen in Oswego.

Flood in LIVINGSTON, NEW YORK
From 20-JUN-19 09:30:00 to 20-JUN-19 10:30:00 (EST-5)
Location: SONYEA
Flood cause: Heavy Rain
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Public

Route 36 was closed by high water between Ridge Road and Cleveland Road.

Flash Flood in OSWEGO, NEW YORK
From 20-JUN-19 11:00:00 to 20-JUN-19 13:00:00 (EST-5)
Location: OSWEGO CENTER
Flood cause: Heavy Rain
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Public

Route 7 was reported flooded and closed in Oswego Center.

Flash Flood in OSWEGO, NEW YORK
From 20-JUN-19 11:30:00 to 20-JUN-19 13:30:00 (EST-5)
Location: FULTON
Flood cause: Heavy Rain
Property damage: 20.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Widespread flooding was reported across the City of Fulton.

Flood in ONTARIO, NEW YORK
From 20-JUN-19 08:45:00 to 20-JUN-19 10:45:00 (EST-5)
Location: HONEOYE
Flood cause: Heavy Rain
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Water was reported over Route 20A.

Flood in CATTARAUGUS, NEW YORK
From 20-JUN-19 09:30:00 to 20-JUN-19 10:30:00 (EST-5)
Location: SALAMANCA
Flood cause: Heavy Rain
Property damage: 1.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Street flooding was reported in Salamanca.

Flood in OSWEGO, NEW YORK
From 21-JUN-19 05:00:00 to 21-JUN-19 05:00:00 (EST-5)
Location: OSWEGO BEACH
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Flood waters continued to keep roads closed in Oswego overnight through the morning of June 21.

Flash Flood in MONROE, NEW YORK
From 20-JUN-19 08:20:00 to 20-JUN-19 10:20:00 (EST-5)
Location: MENDON
Flood cause: Heavy Rain
Property damage: 40.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several roads flooded in Mendon with cars under water.

Flash Flood in MONROE, NEW YORK
From 20-JUN-19 08:30:00 to 20-JUN-19 10:30:00 (EST-5)
Location: HENRIETTA
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Water was reported to be closing I-90 at exit 46 and Route 15A.

Flash Flood in MONROE, NEW YORK
From 20-JUN-19 09:00:00 to 20-JUN-19 11:00:00 (EST-5)
Location: BUSHNELL BASIN
Flood cause: Heavy Rain
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

Flowing water was reported over Park Road in Powder Mills Park.

Heavy Rain in OSWEGO, NEW YORK
From 20-JUN-19 11:30:00 to 20-JUN-19 11:30:00 (EST-5)
Location: FULTON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Heavy rainfall of 3.22 inches reported in Fulton.