Scattered thunderstorms produced heavy rain and flooding across portions of northern Illinois during the morning and afternoon of August 9th.  Additional thunderstorms in the afternoon and evening produced several tornadoes.

Tornado in DE KALB, ILLINOIS
From 09-AUG-21 16:37:00 to 09-AUG-21 16:47:00 (CST-6)
Location: ESMOND
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado with peak winds of 85 mph, which touched down in far eastern Ogle County, crossed into western DeKalb County between Route 64 and Welty Road.  The tornado damaged a farm outbuilding on Esmond Road, just south of Route 64.  A video of this tornado showed the winds entered the building on the southwest fa��ade which caused uplift of the roof and subsequent collapse of the walls.  The tornado continued moving east, immediately north of Route 64 producing sporadic tree damage.  Video showed the tornado crossed Route 64, immediately east of McQueen Road and continued east of Malta Road, where it produced some tree damage and then lifted.

Tornado in KANE, ILLINOIS
From 09-AUG-21 17:38:00 to 09-AUG-21 17:39:00 (CST-6)
Location: VIRGIL
Tornado F-scale: EFU
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter video showed a very brief tornado touched down in a field south of Route 64 and north of Welter Road.  The location was estimated and no damage was reported.

Tornado in KANE, ILLINOIS
From 09-AUG-21 16:24:00 to 09-AUG-21 16:39:00 (CST-6)
Location: BURLINGTON
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado with peak winds of 95 mph touched down just east of the DeKalb Kane County line, northwest of Plank Road.  A garage door was blown in and several trees were uprooted at a residence just west of Engel Road.  The tornado moved east along the south side of Plank Road, producing tree damage.  A large farm outbuilding was damaged west of Lawrence Road.  The tornado then moved southeast where it produced sporadic tree and crop damage along Waughon and Peplow Roads.  The tornado continued southeast and lifted near the intersection of Burlington and Romke Roads.

Tornado in LEE, ILLINOIS
From 09-AUG-21 17:03:00 to 09-AUG-21 17:08:00 (CST-6)
Location: PAW PAW AIRPORT
Tornado F-scale: EFU
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Based on spotter reports and video footage, a tornado touched down near German Road, north of Chicago Road, just east of Interstate 39.  The tornado moved northeast producing a swath of crop damage to corn fields between Moffet Road and Paw Paw Road.  The tornado lifted near Howlett Road, east of Paw Paw Road.  This tornado did not produce damage to any qualified damage indicators and a peak wind speed could not be estimated.  The path of this tornado was determined, in part, using high resolution satellite imagery.

Tornado in KANE, ILLINOIS
From 09-AUG-21 17:28:00 to 09-AUG-21 17:37:00 (CST-6)
Location: RICHARDSON
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado with peak winds of 85 mph touched down just south of Peterson Road and just east of the Kane DeKalb County line.  The tornado damaged several farm buildings and the roof of a home north of Welter Road and east of Fabris Road.  Drone footage showed the tornado then widened to nearly 400 yards as it tracked across a field north of Welter Road and west of Meredith Road.  Sporadic tree damage also occurred along Welter Road and along Meredith Road.  The tornado contracted and lifted along Welter Road, east of Meredith Road.

Flood in WINNEBAGO, ILLINOIS
From 09-AUG-21 14:00:00 to 09-AUG-21 16:30:00 (CST-6)
Location: (RFD) ROCKFORD AIRPORT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Multiple videos shared on social media showed minor street flooding in Rockford and Loves Park.  Two lanes were blocked by flood waters on Auburn Street near Russell Avenue.

Tornado in OGLE, ILLINOIS
From 09-AUG-21 16:28:00 to 09-AUG-21 16:37:00 (CST-6)
Location: LINDENWOOD
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado with peak winds of 85 mph touched down just east of Interstate 39 and south of Route 64.  Significant damage occurred to a farm outbuilding on South Chamberlain Road.  The tornado damaged crops along its path in Ogle County and crossed into DeKalb County between Route 64 and Welty Road.

Tornado in DE KALB, ILLINOIS
From 09-AUG-21 15:35:00 to 09-AUG-21 15:36:00 (CST-6)
Location: ESMOND
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A brief tornado with peak winds of 60 mph touched down just north of Lindenwood Road, crossing Esmond Road and produced minor damage to a farm outbuilding's roof.  This tornado was likely on the ground for less than one minute.

Tornado in MCHENRY, ILLINOIS
From 09-AUG-21 15:45:00 to 09-AUG-21 15:46:00 (CST-6)
Location: MCCULLOM LAKE
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A brief tornado with peak winds of 90 mph touched down at the Petersen Farm, just east of McCullom Lake Road where it damaged a barn and a ground marker.  The tornado moved east and damaged siding and porches on a few townhouses on Evergreen Circle.  A portion of a roof was removed from a townhouse on Evergreen Circle.  The tornado lifted just before it reached the Home Depot store on Richmond Road.

Tornado in DE KALB, ILLINOIS
From 09-AUG-21 17:13:00 to 09-AUG-21 17:18:00 (CST-6)
Location: SYCAMORE
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado with peak winds of 105 mph touched down west of Fenstermaker Road and south of Bethany Road.  Shortly after touching down, just east of Fenstermaker Road, the tornado produced a concentrated corridor of damage where two farm buildings were nearly completely destroyed.  Several trees in the area had trunks snapped near their bases.  A single family home suffered some shingle loss along with two broken windows.  Drone footage showed the tornado quickly widened to 150 yards as it moved east towards Airport Road, producing tree and crop damage.  Farm outbuildings were damaged near Airport Road.  Drone footage suggest the tornado lifted near the South Branch of the Kishwaukee River, north of Barber Green Road.

Tornado in DE KALB, ILLINOIS
From 09-AUG-21 15:44:00 to 09-AUG-21 15:47:00 (CST-6)
Location: KIRKLAND
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado with peak winds of 90 mph touched down near Owens Creek, west of Malta Road.  Video of this tornado showed it may have intermittently skipped on the ground shortly after touching down.  Drone footage showed crop damage increased in a farm east of Byers Road and a barn was heavily damaged.  This tornado dissipated east of Pearl Street.  The path of this tornado was determined, in part, using high resolution satellite imagery.

Tornado in DE KALB, ILLINOIS
From 09-AUG-21 17:26:00 to 09-AUG-21 17:27:00 (CST-6)
Location: MAPLE PARK
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A brief tornado with peak winds of 60 mph touched down near Barber Green Road, just west of the DeKalb Kane County line, producing some tree damage.

Flood in BOONE, ILLINOIS
From 09-AUG-21 15:10:00 to 09-AUG-21 17:30:00 (CST-6)
Location: BELVIDERE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Flooding of small streams and ditches was reported.