Scattered severe thunderstorms moved across parts of northern Illinois during the late evening of May 14th.  Additional thunderstorms produced heavy rain and localized flash flooding during the late evening of May 14th into the morning of May 15th.  Some of the highest 48 hour rainfall totals ending Friday morning May 15th included: 4.75 inches near Sycamore; 4.71 inches near Park Ridge; 4.69 inches in St. Charles; 4.61 inches two miles west of Elgin; 4.35 inches in De Kalb; 4.26 inches at Chicago O'Hare Airport (ORD); 4.22 inches in Cortland; 4.14 inches in Waukegan; 3.98 inches in Kankakee; 3.94 inches in Harwood Heights; 3.86 inches in Dixon and 3.72 inches in Cary.

Thunderstorm Wind in KANE, ILLINOIS
From 14-MAY-20 23:29:00 to 14-MAY-20 23:29:00 (CST-6)
Location: LOVEDALE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

A healthy one foot diameter tree limb was blown down from a maple tree.

Thunderstorm Wind in KANKAKEE, ILLINOIS
From 14-MAY-20 21:10:00 to 14-MAY-20 21:10:00 (CST-6)
Location: MOMENCE
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trees and power lines were blown down along River Road, west of Momence.

Thunderstorm Wind in LEE, ILLINOIS
From 14-MAY-20 22:10:00 to 14-MAY-20 22:10:00 (CST-6)
Location: SUBLETTE
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Tree damage was reported in the Woodhaven Lakes area.

Thunderstorm Wind in LEE, ILLINOIS
From 14-MAY-20 22:18:00 to 14-MAY-20 22:18:00 (CST-6)
Location: SUBLETTE
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Part of a roof was uplifted in Sublette.

Thunderstorm Wind in LEE, ILLINOIS
From 14-MAY-20 22:25:00 to 14-MAY-20 22:25:00 (CST-6)
Location: ROXBURY
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Over ten tall wooden utility poles were blown down, just west of Interstate 39.

Thunderstorm Wind in LA SALLE, ILLINOIS
From 14-MAY-20 22:35:00 to 14-MAY-20 22:35:00 (CST-6)
Location: LELAND
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Tree damage was reported just north of Leland.

Thunderstorm Wind in DE KALB, ILLINOIS
From 14-MAY-20 22:35:00 to 14-MAY-20 22:35:00 (CST-6)
Location: VICTOR
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A large tree limb was snapped off.

Thunderstorm Wind in LEE, ILLINOIS
From 14-MAY-20 22:34:00 to 14-MAY-20 22:36:00 (CST-6)
Location: PAW PAW
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Numerous trees were blown down or snapped off in Paw Paw including along Chicago Road, Chapman Street and Maple Street.

Thunderstorm Wind in DE KALB, ILLINOIS
From 14-MAY-20 22:55:00 to 14-MAY-20 22:55:00 (CST-6)
Location: HINCKLEY ARPT
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees and power lines were blown down.

Thunderstorm Wind in KANE, ILLINOIS
From 14-MAY-20 23:24:00 to 14-MAY-20 23:24:00 (CST-6)
Location: AURORA MUNI ARPT
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in DE KALB, ILLINOIS
From 14-MAY-20 23:00:00 to 14-MAY-20 23:00:00 (CST-6)
Location: HINCKLEY
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Large tree limbs were blown down.

Thunderstorm Wind in DE KALB, ILLINOIS
From 14-MAY-20 23:00:00 to 14-MAY-20 23:00:00 (CST-6)
Location: HINCKLEY
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Tree damage was reported north of Hinckley.

Flash Flood in LIVINGSTON, ILLINOIS
From 14-MAY-20 20:30:00 to 15-MAY-20 02:15:00 (CST-6)
Location: MUNSTER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Multiple roads were flooded in northwest Livingston County.

Flash Flood in DE KALB, ILLINOIS
From 14-MAY-20 23:15:00 to 15-MAY-20 03:00:00 (CST-6)
Location: WILKINSON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Route 64 at 1st street was impassible due to flood waters.

Flash Flood in DE KALB, ILLINOIS
From 14-MAY-20 23:20:00 to 15-MAY-20 03:00:00 (CST-6)
Location: CORTLAND
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Water and crop debris from fields was reported over the road at Perry and Somonauk Roads.

Flash Flood in MCHENRY, ILLINOIS
From 14-MAY-20 23:00:00 to 15-MAY-20 03:00:00 (CST-6)
Location: HUNTLEY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Numerous reports of flooding were received from Huntley, Lakewood and Algonquin.

Heavy Rain in COOK, ILLINOIS
From 14-MAY-20 21:35:00 to 14-MAY-20 21:45:00 (CST-6)
Location: BURBANK
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rainfall of 1.10 inches was measured in 10 minutes.

Flash Flood in KANKAKEE, ILLINOIS
From 14-MAY-20 21:30:00 to 15-MAY-20 02:15:00 (CST-6)
Location: BOURBONNAIS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Numerous streets and underpasses were flooded in Bradley.

Flash Flood in KANKAKEE, ILLINOIS
From 14-MAY-20 21:30:00 to 15-MAY-20 02:15:00 (CST-6)
Location: YEAGER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Multiple reports of flash flooding were received from the Momence area, including two feet of water over 4000 N Road, northwest of Momence.  Storm total rainfall of 4.07 inches was reported in Momence.

Flash Flood in KANKAKEE, ILLINOIS
From 14-MAY-20 20:52:00 to 15-MAY-20 02:15:00 (CST-6)
Location: HERSCHER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Flooding was reported across most roads in the Herscher area including flood waters across all of Route 115, which was closed during the peak of the heavy rain.  Horse Creek was 90% full at 9000 W Road and well over its banks at 10000 W Road.  Pilot Drive was also flooded.  Storm total rainfall of 4.10 inches was reported in Herscher.

Flood in LEE, ILLINOIS
From 14-MAY-20 22:30:00 to 15-MAY-20 02:00:00 (CST-6)
Location: ELDENA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flooding was reported at Route 26 and Route 30 as well as on residential Streets in Amboy.

Thunderstorm Wind in KANKAKEE, ILLINOIS
From 14-MAY-20 21:15:00 to 14-MAY-20 21:15:00 (CST-6)
Location: DELMAR
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Utility poles were damaged northeast of Momence.

Flood in DU PAGE, ILLINOIS
From 15-MAY-20 17:00:00 to 15-MAY-20 17:00:00 (CST-6)
Location: WINFIELD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

An 18 year old woman attempted to cross a flooded pedestrian bridge in the Winfield Mounds Forest Preserve and was swept away.  A witness said water from the West Branch DuPage River was waist deep over the bridge.  The woman's body was found several days later.

Flash Flood in DU PAGE, ILLINOIS
From 15-MAY-20 00:00:00 to 15-MAY-20 03:15:00 (CST-6)
Location: FOX CROFT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Route 53 was closed near Butterfield Road and Park Boulevard due to flooding from the East Branch DuPage River.

Flash Flood in DU PAGE, ILLINOIS
From 15-MAY-20 00:00:00 to 15-MAY-20 03:15:00 (CST-6)
Location: NORTH LAKE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

In Elmhurst, 1 to 2 feet of flood waters were reported on Interstate 290.  North Avenue was closed at Interstate 290 due to flooding.  Some interchange ramps were also closed.

Flash Flood in LAKE, ILLINOIS
From 15-MAY-20 00:00:00 to 15-MAY-20 03:15:00 (CST-6)
Location: RUSSELL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Multiple intersections were flooded and closed around Zion including on Route 173 and on Wadsworth Road.

Flash Flood in LAKE, ILLINOIS
From 15-MAY-20 00:00:00 to 15-MAY-20 03:15:00 (CST-6)
Location: GURNEE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Route 41 near Route 132 was closed due to flooding.

Flash Flood in KANE, ILLINOIS
From 14-MAY-20 23:30:00 to 15-MAY-20 03:15:00 (CST-6)
Location: COLEMAN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Route 25 was closed due to flooding near Gilberts Street.

Flash Flood in DU PAGE, ILLINOIS
From 14-MAY-20 23:40:00 to 15-MAY-20 03:15:00 (CST-6)
Location: SCHICK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Klein Creek exceeded bankfull stage in Carol Stream.  Flooding was reported on many streets in Carol Stream.  Flood waters were nearing a structure near Kuhn Road and Munson Drive.  Rainfall of 5.67 inches was measured in Carol Stream over a 36 hour period on the morning of May 15th.

Flash Flood in COOK, ILLINOIS
From 14-MAY-20 23:30:00 to 15-MAY-20 03:15:00 (CST-6)
Location: BERKELEY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Heavy rain fell across much of northern Cook County, which caused flooding in many areas.  In Elk Grove Village, water was up to doorways in a town home complex near Beisner Road.  Nearby retention ponds were overflowing.  North of Roselle, a retention pond was overflowing near Marion Street and Arthur Avenue.  Street flooding was reported in Hanover Park with 1 to 2 feet of water on Barrington Road.  Street flooding was reported in Bartlett.  Near Des Plaines, Central Road was closed between Route 45 and Deerlove Road due to flooding.  Near Schiller Park, Irving Park Road was flooded near O'Hare Airport with numerous cars flooded.  Lawrence Avenue was closed near Interstate 294 due to a flooded underpass.  In Northlake, Grand Avenue was closed due to flooding near Interstate 294.  Near Golf, Route 58 was closed due to flooding at Route 43.  Numerous streets were flooded on the north side of Chicago including at Devon Avenue and Milwaukee.  Interstate 94 was briefly closed due to flooding.  Multiple water rescues occurred between Interstate 90 at Touhy Avenue.  One family waited on the top of their car near Pratt Avenue until firefighters arrived.

Flash Flood in COOK, ILLINOIS
From 15-MAY-20 00:00:00 to 15-MAY-20 03:15:00 (CST-6)
Location: CHICAGO
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flooding was reported on 47th street at a railroad underpass with a water rescued reported.

Flash Flood in WILL, ILLINOIS
From 15-MAY-20 00:00:00 to 15-MAY-20 03:15:00 (CST-6)
Location: RIDGEWOOD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Route 30 was closed due to flooding of an underpass near Highland Park Drive.

Flood in COOK, ILLINOIS
From 15-MAY-20 03:15:00 to 15-MAY-20 09:00:00 (CST-6)
Location: ELK GROVE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Heavy rain caused flooding across many areas of northern Cook County during the early morning of May 15th which slowly receded through mid to late morning.

Flash Flood in COOK, ILLINOIS
From 14-MAY-20 23:30:00 to 15-MAY-20 03:15:00 (CST-6)
Location: AVONDALE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Lake Shore Drive was flooded in numerous locations including underpasses.

Lightning in WILL, ILLINOIS
From 14-MAY-20 23:40:00 to 14-MAY-20 23:40:00 (CST-6)
Location: LOCKPORT LEWIS ARPT
Property damage: 1.00K
Crop damage: 0.00K
Reported by: NWS Employee

Lightning struck the WSR-88D radar at the National Weather Service office in Romeoville.  A computer and other electronics were damaged.