Thunderstorms developed during the late evening of July 11th across far northeast Illinois and continued into the morning of July 12th producing torrential rainfall which continued over the same areas for hours producing flash flooding and major river flooding.

Hail in KANE, ILLINOIS
From 11-JUL-17 21:33:00 to 11-JUL-17 21:34:00 (CST-6)
Location: PINGREE GROVE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in KANE, ILLINOIS
From 11-JUL-17 21:39:00 to 11-JUL-17 21:39:00 (CST-6)
Location: PINGREE GROVE
Magnitude: 68.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A wind gust to 78 mph was measured on a home weather station.  Tree limbs 3 to 5 inches in diameter were blown down.

Heavy Rain in KANE, ILLINOIS
From 11-JUL-17 20:45:00 to 11-JUL-17 22:25:00 (CST-6)
Location: CARPENTERSVILLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Rainfall of 2.01 inches was measured in 1 hour and 40 minutes.

Hail in COOK, ILLINOIS
From 12-JUL-17 07:40:00 to 12-JUL-17 07:40:00 (CST-6)
Location: ELK GROVE VLG
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MCHENRY, ILLINOIS
From 12-JUL-17 08:13:00 to 12-JUL-17 08:13:00 (CST-6)
Location: CARY
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in LAKE, ILLINOIS
From 12-JUL-17 08:19:00 to 12-JUL-17 08:19:00 (CST-6)
Location: MUNDELEIN
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in COOK, ILLINOIS
From 12-JUL-17 08:35:00 to 12-JUL-17 08:35:00 (CST-6)
Location: GLENVIEW
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in LAKE, ILLINOIS
From 12-JUL-17 08:20:00 to 12-JUL-17 08:20:00 (CST-6)
Location: BUFFALO GROVE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Tree limbs were blown down.

Thunderstorm Wind in KANE, ILLINOIS
From 12-JUL-17 08:45:00 to 12-JUL-17 08:45:00 (CST-6)
Location: PINGREE GROVE
Magnitude: 55.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Public

Twenty utility poles were snapped at the base.

Flood in COOK, ILLINOIS
From 12-JUL-17 09:22:00 to 12-JUL-17 10:30:00 (CST-6)
Location: DEERING
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Standing water 2 to 6 inches deep was reported near Belmont Avenue and Lake Shore Drive.

Flood in KANE, ILLINOIS
From 12-JUL-17 13:00:00 to 13-JUL-17 08:00:00 (CST-6)
Location: RICHARDSON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

After torrential rain and flash flooding during the morning of July 12th, flood waters slowly receded through the morning of July 13th with additional rain falling during the early morning hours of July 13th.

Flood in LAKE, ILLINOIS
From 12-JUL-17 13:00:00 to 13-JUL-17 08:00:00 (CST-6)
Location: BARRINGTON HILLS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

After torrential rain and flash flooding during the morning of July 12th, flood waters slowly receded through the morning of July 13th with additional rain falling during the early morning hours of July 13th.

Flood in MCHENRY, ILLINOIS
From 12-JUL-17 03:00:00 to 31-JUL-17 12:00:00 (CST-6)
Location: MC CULLOM LAKE
Flood cause: Heavy Rain
Property damage: 3.90M
Crop damage: 0.00K
Reported by: Emergency Manager

Heavy rain fell across McHenry County and southeast Wisconsin between July 11th and July 13th which lead to major flooding along the Fox River.  The river gage at the McHenry Lock & Dam crested at 7.60 feet on July 22nd, the second highest crest on record.  Flood stage at the McHenry Lock & Dam is 4 feet.  The river gage at the Algonquin Tailwater measured a record crest of 13.15 feet on July 24th.  Flood stage at the Algonquin Tailwater is 9.5 feet.  There were 557 homes affected with some amount of water from the river flooding.

Flash Flood in LAKE, ILLINOIS
From 12-JUL-17 01:00:00 to 12-JUL-17 13:00:00 (CST-6)
Location: BARRINGTON HILLS
Flood cause: Heavy Rain
Property damage: 12.70M
Crop damage: 0.00K
Reported by: Law Enforcement

Torrential rain fell across much of Lake County during the morning of July 12th causing widespread flash flooding.  Numerous roads were impassable.  In Mundelein, numerous houses were flooded and people were rescued by raft.  Cars were stranded in flood waters in Libertyville.  Garage and basement flooding was reported in Fox Lake.  Two day storm total rainfall amounts included 7.22 inches two miles west of Gurnee; 7.13 inches in Round Lake Park; 7.11 inches two miles west southwest of Lake Villa; 6.75 inches in Mundelein; 6.69 inches one mile west of Lake Bluff; 6.46 inches two miles north northeast of Lake Forest; 5.53 inches two miles east of Waukegan; 5.49 inches two miles west northwest of Mundelein; 5.15 inches two miles southeast of Fox Lake; 4.70 inches in Riverwoods and 4.55 inches two miles southeast of Lakemoor.  Major flooding with record crests occurred on the Des Plaines River.

Flash Flood in KANE, ILLINOIS
From 11-JUL-17 22:15:00 to 12-JUL-17 13:00:00 (CST-6)
Location: RICHARDSON
Flood cause: Heavy Rain
Property damage: 500.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorms produced torrential rain which caused widespread flooding and flash flooding across northern portions of Kane County.  Numerous cars were stuck in water near Route 47 and Route 72 near Pingree Grove.  Many roads in Elgin and west of Elgin were flooded and impassable.  Basement flooding was also reported in many areas with 76 homes suffering water damage.  Two day storm total rainfall amounts included 7.31 inches one mile south of Elgin; 5.00 inches one east of Carpentersville; 4.60 inches in Gilberts and 4.08 inches two miles northeast of Elgin.

Flood in LAKE, ILLINOIS
From 12-JUL-17 03:00:00 to 24-JUL-17 12:00:00 (CST-6)
Location: RUSSELL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Heavy rain fell across Lake County and southeast Wisconsin between July 11th and July 13th which lead to record flooding along the Des Plaines River.  The river gage at Russell measured a record crest of 12.15 feet on July 14th.  Flood stage at Russell is 7 feet.  The river gage at Gurnee measured a record crest of 12.09 feet on July 16th.  Flood stage at Gurnee is 7 feet.  The river gage at Lincolnshire measured a record crest of 16.53 feet on July 13th.  Flood stage at Lincolnshire is 12.5 feet.  River levels held nearly steady around major flood stage for several days and then began a steady fall about a week after the heavy rains.