Well ahead of an approaching cold front and more tied to convective enhanced shortwave, strong thunderstorms developed in clusters early morning. Warm rain processes dominated with precipitable water values closing in on 1.8 inches. Congealing storms dropped very heavy rain over north Buffalo to the Tonawandas. The rain occurred in span of 60-90 mins. As storms moved east, they progressed more quickly, so the main focus turned to strong winds once they moved into Ontario and Wayne counties and their adjoining waters.

Flash Flood in ERIE, NEW YORK
From 21-AUG-19 05:58:00 to 21-AUG-19 06:00:00 (EST-5)
Location: FALCONWOOD
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Department of Highways

Route 266 was closed from Sheridan Drive to Grand Island Boulevard due to flooding.

Flood in ERIE, NEW YORK
From 21-AUG-19 07:05:00 to 21-AUG-19 09:05:00 (EST-5)
Location: BUFFALO
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Flood water was reported to persist from overnight storms into the morning rush hour in much of north Buffalo and the Northtowns.

Flash Flood in ERIE, NEW YORK
From 21-AUG-19 03:23:00 to 21-AUG-19 05:59:00 (EST-5)
Location: KENMORE
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Department of Highways

Niagara Falls Boulevard was closed from Alameda Avenue to Maple Road due to flooding.

Flash Flood in ERIE, NEW YORK
From 21-AUG-19 03:30:00 to 21-AUG-19 05:30:00 (EST-5)
Location: TONAWANDA
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Flooding with flowing water was reported at Morgan Street and Kohler Street.

Flash Flood in ERIE, NEW YORK
From 21-AUG-19 03:00:00 to 21-AUG-19 05:59:00 (EST-5)
Location: BUFFALO
Flood cause: Heavy Rain
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Department of Highways

The ramp from 190 north to 198 east was closed due to flooding.

Flash Flood in ERIE, NEW YORK
From 21-AUG-19 03:42:00 to 21-AUG-19 05:42:00 (EST-5)
Location: TONAWANDA
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Department of Highways

Knoche Road was closed due to flooding between Elmwood and Deleware Avenues.

Flash Flood in ERIE, NEW YORK
From 21-AUG-19 03:50:00 to 21-AUG-19 05:50:00 (EST-5)
Location: KENMORE
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Department of Highways

Route 324 was closed due to high water from Colvin Boulevard to Belmont Avenue.

Flash Flood in ERIE, NEW YORK
From 21-AUG-19 04:10:00 to 21-AUG-19 05:50:00 (EST-5)
Location: FALCONWOOD
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Department of Highways

Route 324 west was closed at Military Road due to high water.

Heavy Rain in ERIE, NEW YORK
From 21-AUG-19 03:00:00 to 21-AUG-19 04:30:00 (EST-5)
Location: KENMORE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy rain of 2.51 inches was reported in 60-90 minutes.

Thunderstorm Wind in OSWEGO, NEW YORK
From 21-AUG-19 05:59:00 to 21-AUG-19 05:59:00 (EST-5)
Location: SANDY POND
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Wires and trees were reported to be down.