A cold front moved slowly southward across Lake Erie and northern Ohio into a moist environment early Labor Day morning. A strong jet aloft fueled persistent moisture advection along with significant backbuilding and training of thunderstorms across the area between about 6am and 6pm Monday. This resulted in a widespread 2-5��� of rain with isolated amounts even higher. Later that afternoon, the primary weather hazard shifted to severe thunderstorms with two tornado warnings and three severe thunderstorm warnings being issued, with lots of tree damage and hail up to 2��� in diameter, mainly for Knox and Holmes Counties. The night concluded with heavy rain over urban portions of Marion County resulting in significant flooding in the City of Marion.

Flash Flood in MEDINA, OHIO
From 07-SEP-20 08:21:00 to 07-SEP-20 13:00:00 (EST-5)
Location: BRUNSWICK
Flood cause: Heavy Rain
Property damage: 1000.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Brunswick of flooding along Laurel and Pearl road which was closed at 921 AM. Water rescues were conducted. Radar estimated 2 to 3 inches of rain had fallen, most of it between 845 and 915 AM EDT.

Flash Flood in CUYAHOGA, OHIO
From 07-SEP-20 09:30:00 to 07-SEP-20 15:00:00 (EST-5)
Location: MAPLE HGTS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Interstate 480 flooded both eastbound lanes near Broadway (SR14) and Trinity High School. Radar estimated 2 to 3 inches of rain in the area at that time. Nearby Brecksville gage reported 2.21���.

Flash Flood in CUYAHOGA, OHIO
From 07-SEP-20 09:30:00 to 07-SEP-20 12:00:00 (EST-5)
Location: BEREA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Sewer lid blew of eastbound lane of W 117th Street with water spilling into the street.

Flash Flood in CUYAHOGA, OHIO
From 07-SEP-20 09:35:00 to 07-SEP-20 12:00:00 (EST-5)
Location: LAKEWOOD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Eastbound on I-90 closed near McKinley between Lakewood and Rocky River. W 117th Street and Madison closed in both directions from flooding.

Flash Flood in CUYAHOGA, OHIO
From 07-SEP-20 09:58:00 to 07-SEP-20 15:45:00 (EST-5)
Location: BRATENAHL
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Doan Brook flows from Shaker Lakes through the University Circle in eastern Cleveland. Reports of upwards of 4.09 had fallen across the small and mainly urban watershed on the morning of Labor Day, causing an upstream reservoir the Horseshoe Lake Dam in Shaker Height to overtop. Horseshoe Lake, a high hazard dam, had been constructed in 1852 and in 2019 had been drained after being designated at structurally deficient by Ohio Department of Natural Resources. Despite being near empty the lake was able to fill and overtop on Labor Day after a basin average of 4 inches of rain fell. Concerns were raised by Emergency Management that the earthen dam could erode and collapse from the overtopping, however ultimately the dam held.
The additional flows from the lake and the urban runoff caused Doan Brook to flood through the watershed from the intersection of Coventry Road and North Park Blvd and the Cleveland Cultural Gardens along MLK Parkway.  Swift water rescue team deployed for multiple vehicles stuck in flowing flood waters along MLK Parkway.  A USGS stream gage on Doan Brook crested at 11.39 feet at 10:55 AM with peak flows between a 50 and 100 year flood. Damage included multiple flooded cars and road washout.

Flash Flood in CUYAHOGA, OHIO
From 07-SEP-20 10:36:00 to 07-SEP-20 12:35:00 (EST-5)
Location: PEPPER PIKE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Flooding on Lander Road between Shake and South Woodland. Video of police rescuing motorists in waist deep water. Water was from overland runoff and not attributed to any stream or creek.

Flash Flood in CUYAHOGA, OHIO
From 07-SEP-20 10:27:00 to 07-SEP-20 14:30:00 (EST-5)
Location: SOLON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Widespread flooding across Solon. Carter Street near David and Bainbridge west of Kruse reportedly impacted the most with road closures and flooded cars.

Flash Flood in CUYAHOGA, OHIO
From 07-SEP-20 10:25:00 to 07-SEP-20 11:30:00 (EST-5)
Location: EAST CLEVELAND
Flood cause: Heavy Rain
Property damage: 35.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Road eroded by flood waters on Superior Ave and South Taylor Road in Cleveland Heights.

Flash Flood in CUYAHOGA, OHIO
From 07-SEP-20 10:19:00 to 07-SEP-20 13:00:00 (EST-5)
Location: GARFIELD HGTS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Water rescue conducted on Broadway by West 98th Street. Flooding on  Broadview Rd. due to an overflowing catch basin across the highway.

Flash Flood in CUYAHOGA, OHIO
From 07-SEP-20 10:12:00 to 07-SEP-20 12:40:00 (EST-5)
Location: NEWBURGH HGTS
Flood cause: Heavy Rain
Property damage: 2.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Vehicles trapped in flood waters on Harvard and Jennings Parkway.

Flash Flood in CUYAHOGA, OHIO
From 07-SEP-20 11:09:00 to 07-SEP-20 14:00:00 (EST-5)
Location: NORTH ROYALTON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Several streets covered with running or standing water including Julia Drive.

Flash Flood in GEAUGA, OHIO
From 07-SEP-20 11:31:00 to 07-SEP-20 16:00:00 (EST-5)
Location: RUSSELL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Widespread flooding throughout town and many roads impassable. There was 3.26��� of rain that had fallen at the onset of the flooding, with an additional 1 to 1.5 inches by the end of the event based on radar.

Flash Flood in MEDINA, OHIO
From 07-SEP-20 12:42:00 to 07-SEP-20 15:00:00 (EST-5)
Location: BRUNSWICK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Brunswick Lake dam overtopped with flooding on Plum Creek and other local creeks. Rainfall reports of 3.56���. No reports of properties inundated.

Flash Flood in MEDINA, OHIO
From 07-SEP-20 15:30:00 to 07-SEP-20 16:00:00 (EST-5)
Location: WADSWORTH ARPT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

River Styx flooded near the Airport, Seville Road and Greenwich Road.

Flash Flood in PORTAGE, OHIO
From 07-SEP-20 15:00:00 to 07-SEP-20 16:00:00 (EST-5)
Location: MORAN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Route 303 eastbound lane closed between Stone Road and Jefferson Street.

Flash Flood in CUYAHOGA, OHIO
From 07-SEP-20 14:58:00 to 07-SEP-20 16:00:00 (EST-5)
Location: STRONGSVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Prime Road closed north of Albion and Marks Road south of Johnathan Drive. Big Creek Road was closed in Bonnie Park.

Flash Flood in CUYAHOGA, OHIO
From 07-SEP-20 13:35:00 to 07-SEP-20 15:30:00 (EST-5)
Location: BRECKSVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Retention pond on Falls Lane overflowed and several properties flooded.

Flash Flood in SUMMIT, OHIO
From 07-SEP-20 13:30:00 to 07-SEP-20 15:00:00 (EST-5)
Location: AKRON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Route 8 northbound was closed from Perkins St to E. Tallmadge Avenue. Akron police reported traffic accidents and delays due to the high water conditions. Route 8 southbound closed at Seasons Rd in Hudson/Stow to flooding. Storm total rainfall from Hudson 4.75���.

Flash Flood in CUYAHOGA, OHIO
From 07-SEP-20 14:24:00 to 07-SEP-20 16:00:00 (EST-5)
Location: BRECKSVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Chippewa Creek Drive flooded when the Chippewa Creek came out of banks with water several feet deep by 4 PM.

Flash Flood in MARION, OHIO
From 07-SEP-20 20:51:00 to 08-SEP-20 03:00:00 (EST-5)
Location: BELLAIRE GARDENS
Flood cause: Heavy Rain
Property damage: 150.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Marion county received between 1 and nearly 5 inches of rain on the evening of the 7th. The heaviest rain fell between 930 and 10 PM, where almost 2 inches fell between the City of Marion and La Rue. The USGS rain gage at La Rue measured 4.71 for a storm total, and gages in Marion ranged from 2.5-4.46. The deluge just before 10 PM was the likely trigger for the overwhelmed storm drainage systems resulting in flash flooding in the city. In all 41 individual water rescues were conducted from trapped motorists, and 11 family homes were evacuated and relocated. Several more homes were flooded, primarily in their basements. Only one home and one apartment complex sustained water damage on the first floor.  The water table prior to this event was unusually low, and the rivers and creeks were able to handle the runoff across most of the county with minimal damages or impacts apart from closed roads.

Thunderstorm Wind in SUMMIT, OHIO
From 07-SEP-20 11:14:00 to 07-SEP-20 11:14:00 (EST-5)
Location: STOW
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Tree uprooted and fell onto house in Stow. Time estimated via radar.

Thunderstorm Wind in SUMMIT, OHIO
From 07-SEP-20 09:30:00 to 07-SEP-20 09:30:00 (EST-5)
Location: NORTHFIELD
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Tree downed onto house at 185 Rosewood Avenue in Macedonia. Time estimated via radar.

Thunderstorm Wind in HOLMES, OHIO
From 07-SEP-20 16:04:00 to 07-SEP-20 16:04:00 (EST-5)
Location: NASHVILLE
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

At least 40 trees downed along OH 514, about three miles SW of Nashville.

Hail in HOLMES, OHIO
From 07-SEP-20 16:14:00 to 07-SEP-20 16:14:00 (EST-5)
Location: NASHVILLE
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hen egg-size hail in Nashville.

Hail in HOLMES, OHIO
From 07-SEP-20 16:20:00 to 07-SEP-20 16:20:00 (EST-5)
Location: GLENMONT
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter-size to golf ball-size hail and downed trees in Glenmont.

Hail in HOLMES, OHIO
From 07-SEP-20 16:20:00 to 07-SEP-20 16:20:00 (EST-5)
Location: GLENMONT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Quarter-size hail two miles SSW of Glenmont.

Thunderstorm Wind in KNOX, OHIO
From 07-SEP-20 16:52:00 to 07-SEP-20 16:52:00 (EST-5)
Location: MT VERNON
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Multiple trees uprooted or snapped in Mount Vernon.

Thunderstorm Wind in CUYAHOGA, OHIO
From 07-SEP-20 09:15:00 to 07-SEP-20 09:15:00 (EST-5)
Location: BROADVIEW HGTS
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Tree downed onto house in Broadview Heights. Time estimated via radar.

Thunderstorm Wind in ASHLAND, OHIO
From 07-SEP-20 15:52:00 to 07-SEP-20 15:52:00 (EST-5)
Location: LOUDONVILLE
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Multiple trees uprooted or snapped about five miles SW of Loudonville. Time estimated via radar.