Scattered severe thunderstorms moved across northern Illinois during the afternoon of May 23rd producing wind damage, localized flooding and three tornadoes.  Several funnel clouds were also reported.

Thunderstorm Wind in WILL, ILLINOIS
From 23-MAY-20 14:12:00 to 23-MAY-20 14:28:00 (CST-6)
Location: IDYLSIDE
Magnitude: 83.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Dozens of large trees were blown down across Joliet including in downtown.  There was wind damage to multiple roofs, including much of a roof lifted and thrown from a downtown building.  Numerous trees and power lines were blown down.  Near Larkin Avenue and Jefferson Street, widespread tree damage was reported including trees two feet in diameter, blocking multiple streets.  Power lines were blown down along Black Road at Ann Street and Larkin Avenue.  The entire damage area was most likely due to a series of downbursts given the large footprint.  Wind gusts were estimated between 75 mph and 95 mph.

Thunderstorm Wind in WILL, ILLINOIS
From 23-MAY-20 14:04:00 to 23-MAY-20 14:07:00 (CST-6)
Location: SHOREWOOD
Magnitude: 83.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

At least two dozen large trees were blown down, including some snapped in a residential area in Shorewood near Seil Road.  This included large trees blown down along the DuPage River.  The tree damage was concentrated and intense with all trees laying in an easterly direction, indicating a strong downburst.  Power lines were also blown down.  Wind gusts were estimated between 75 mph and 95 mph.

Hail in LIVINGSTON, ILLINOIS
From 23-MAY-20 13:39:00 to 23-MAY-20 13:40:00 (CST-6)
Location: PONTIAC
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Funnel Cloud in LIVINGSTON, ILLINOIS
From 23-MAY-20 13:50:00 to 23-MAY-20 13:50:00 (CST-6)
Location: SAUNEMIN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in LA SALLE, ILLINOIS
From 23-MAY-20 13:15:00 to 23-MAY-20 13:15:00 (CST-6)
Location: MARSEILLES
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in LA SALLE, ILLINOIS
From 23-MAY-20 13:05:00 to 23-MAY-20 13:05:00 (CST-6)
Location: OTTAWA
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trees were blown down on the east side of Ottawa.

Hail in LA SALLE, ILLINOIS
From 23-MAY-20 13:05:00 to 23-MAY-20 13:05:00 (CST-6)
Location: OTTAWA
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in LIVINGSTON, ILLINOIS
From 23-MAY-20 13:39:00 to 23-MAY-20 13:41:00 (CST-6)
Location: PONTIAC
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees and power lines were blown down in and around the Pontiac area.

Thunderstorm Wind in WINNEBAGO, ILLINOIS
From 23-MAY-20 13:53:00 to 23-MAY-20 13:53:00 (CST-6)
Location: WINNEBAGO
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts were estimated to 60 mph.

Hail in WINNEBAGO, ILLINOIS
From 23-MAY-20 13:53:00 to 23-MAY-20 13:53:00 (CST-6)
Location: WINNEBAGO
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WINNEBAGO, ILLINOIS
From 23-MAY-20 13:56:00 to 23-MAY-20 13:56:00 (CST-6)
Location: WINNEBAGO
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Funnel Cloud in OGLE, ILLINOIS
From 23-MAY-20 14:00:00 to 23-MAY-20 14:00:00 (CST-6)
Location: POLO
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in LIVINGSTON, ILLINOIS
From 23-MAY-20 14:58:00 to 23-MAY-20 14:58:00 (CST-6)
Location: CULLOM
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in KANKAKEE, ILLINOIS
From 23-MAY-20 14:47:00 to 23-MAY-20 14:48:00 (CST-6)
Location: BUCKINGHAM
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in KANKAKEE, ILLINOIS
From 23-MAY-20 15:25:00 to 23-MAY-20 15:26:00 (CST-6)
Location: KANKAKEE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in WINNEBAGO, ILLINOIS
From 23-MAY-20 14:50:00 to 23-MAY-20 14:50:00 (CST-6)
Location: SOUTH BELOIT
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Power lines were blown down.

Funnel Cloud in MCHENRY, ILLINOIS
From 23-MAY-20 17:45:00 to 23-MAY-20 17:45:00 (CST-6)
Location: ALGONQUIN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A funnel cloud was reported near Algonquin.

Tornado in OGLE, ILLINOIS
From 23-MAY-20 15:30:00 to 23-MAY-20 15:32:00 (CST-6)
Location: CHANA
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A tornado touched down near the intersection of S Rocky Hollow and E Canfield Roads.  Peak winds were estimated between 90 mph and 100 mph based on damage to outbuildings and two farmsteads that were significantly damaged.  There were also several trees and utility poles blown down.

Flash Flood in WILL, ILLINOIS
From 23-MAY-20 14:15:00 to 23-MAY-20 16:30:00 (CST-6)
Location: (JOT) JOLIET DISTRIC
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Numerous photos of street flooding throughout Joliet were shared.

Heavy Rain in COOK, ILLINOIS
From 23-MAY-20 15:15:00 to 23-MAY-20 16:00:00 (CST-6)
Location: LANSING
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rainfall of 1.70 inches was measured in 45 minutes with a storm total of 2.15 inches.

Thunderstorm Wind in KENDALL, ILLINOIS
From 23-MAY-20 13:56:00 to 23-MAY-20 13:57:00 (CST-6)
Location: WHITE WILLOW
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Small trees and large tree limbs were blown down.

Flash Flood in DE KALB, ILLINOIS
From 23-MAY-20 17:15:00 to 23-MAY-20 20:00:00 (CST-6)
Location: KINGSTON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Creeks were out of their banks with 2 to 3 feet of water over some roads.

Flood in MCHENRY, ILLINOIS
From 23-MAY-20 18:00:00 to 23-MAY-20 19:30:00 (CST-6)
Location: HUNTLEY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A foot of water was reported on Route 47 near Huntley.  Rainfall of 1.93 inches was measured in 45 minutes.

Tornado in KANE, ILLINOIS
From 23-MAY-20 17:13:00 to 23-MAY-20 17:16:00 (CST-6)
Location: HAMPSHIRE
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A tornado touched down in De Kalb County and moved across fields in Kane County and dissipated before reaching Interstate 90.

Tornado in WILL, ILLINOIS
From 23-MAY-20 14:02:00 to 23-MAY-20 14:07:00 (CST-6)
Location: BIRDS
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado touched down in northeast Grundy County, moved into southeast Kendall County and then into far western Will County.  Numerous large tree limbs were blown down.

Flood in KANKAKEE, ILLINOIS
From 23-MAY-20 15:30:00 to 23-MAY-20 18:00:00 (CST-6)
Location: KANKAKEE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Flood waters eroded a stream through a field, which were flowing heavily.

Tornado in GRUNDY, ILLINOIS
From 23-MAY-20 13:53:00 to 23-MAY-20 13:57:00 (CST-6)
Location: SANK RIDGE
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado touched down near Interstate 80, about a mile west of the Minooka exit.  The tornado blew over a car on Interstate 80, which resulted in one injury.  The tornado then moved into southeast Kendall County.

Tornado in KENDALL, ILLINOIS
From 23-MAY-20 13:57:00 to 23-MAY-20 14:02:00 (CST-6)
Location: WHITE WILLOW
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado touched down in northeast Grundy County and moved into southeast Kendall County.  Two wooden utility poles were blown down along with a half dozen large trees and numerous large tree limbs.  The tornado continued into western Will County.

Tornado in DE KALB, ILLINOIS
From 23-MAY-20 17:06:00 to 23-MAY-20 17:13:00 (CST-6)
Location: NEW LEBANON
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A tornado touched down near the intersection of Roosevelt and Melms Road where a barn was damaged and debris from the barn was blown downstream into a field.  The tornado continued across fields until it crossed into Kane County where power lines were blown down.