A wintry mix will continue in interior New England through tonight as a coastal storm quickly passes to the east. Heavy snow is expected in northern Maine, with a coating of ice expected for much of interior New England. Behind this storm system, lake effect snow and snow squalls will develop from the Ohio Valley to interior New England through Monday. Read More >
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Overview graphic |
Radar loop from 4:30 AM to 2:30 PM CDT on Sunday, September 17 |
Fast Facts
For detailed information about this event, see The July 2 and September 17, 2023, Flash Flood Events in the Chicago Metro Area, a NWS Technical Paper which details the rainfall, flooding, and impacts.
Rainfall Reports
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| Bias-corrected radar rainfall totals (4:00 AM to 4:00 PM) with rain gauges overlaid | The estimated annual exceedance probability for the bias-corrected rainfall. |
Location Amount Time/Date Provider ...Illinois... ...Cook County... 1 NNE South Holland 5.69 in 0500 PM 09/17 Mesonet 1 SW Harvey 5.04 in 0500 PM 09/17 Mesonet 1 ESE Markham 4.72 in 0500 PM 09/17 Mesonet 1 SE Midlothian 4.47 in 0700 AM 09/18 CoCoRaHs 1 SE Harvey 4.35 in 0500 PM 09/17 Mesonet 1 S Oak Forest 4.26 in 0500 PM 09/17 Mesonet Phoenix 4.14 in 0300 PM 09/17 Mesonet Hazel Crest 4.02 in 0325 AM 09/18 AWS 2 WNW Chicago Loop 3.15 in 1200 PM 09/17 Mesonet Homewood 2.96 in 0700 AM 09/18 CoCoRaHs Chicago - Northerly Island 2.94 in 0325 AM 09/18 AWS Oak Forest 2.87 in 0700 AM 09/18 CoCoRaHs 2 SW Lincoln Park - Chicago 2.85 in 0317 AM 09/18 CWOP Midlothian 2.78 in 0700 AM 09/18 CoCoRaHs 1 ESE Flossmoor 2.76 in 0700 AM 09/18 CoCoRaHs 2 SE Tinley Park 2.71 in 0319 AM 09/18 CWOP Chicago Loop 2.69 in 0325 AM 09/18 AWS 1 ESE Roseland - Chicago 2.65 in 0200 PM 09/17 Mesonet 1 SSW La Grange Park 2.58 in 0700 AM 09/18 CoCoRaHs Oak Park 2.52 in 0318 AM 09/18 CWOP 1 S Westchester 2.44 in 0300 PM 09/17 Mesonet 1 WNW La Grange Park 2.44 in 0516 PM 09/17 Public 2 NNW Chicago Heights 2.32 in 0700 AM 09/18 CoCoRaHs 1 NNE Oak Park 2.29 in 0700 AM 09/18 CoCoRaHs 1 E Matteson 2.25 in 0700 AM 09/18 CoCoRaHs Thornton 2.24 in 0400 PM 09/17 Mesonet Westchester 2.22 in 0300 PM 09/17 Mesonet 1 SW Westchester 2.12 in 0300 PM 09/17 Mesonet 2 N Hegeswisch - Chicago 2.11 in 0500 PM 09/17 Mesonet 1 S Arlington Heights 2.09 in 0700 AM 09/18 CoCoRaHs Elk Grove Village 2.07 in 0700 AM 09/18 CoCoRaHs 1 NNE Palatine 2.06 in 0700 AM 09/18 CoCoRaHs 1 WNW Park Forest 1.98 in 0700 AM 09/18 CoCoRaHs Franklin Park 1.85 in 0319 AM 09/18 CWOP South Holland 1.85 in 0325 AM 09/18 AWS 2 NNE Tinley Park 1.71 in 0325 AM 09/18 AWS Chicago - O`Hare Airport 1.60 in 0251 AM 09/18 ASOS Chicago 1.59 in 0317 AM 09/18 CWOP River Forest 1.59 in 0325 AM 09/18 AWS 1 SW Palos Park 1.59 in 0700 AM 09/18 CoCoRaHs Hoffman Estates 1.55 in 0315 AM 09/18 CWOP Riverside - Des Plaines R. 1.46 in 0245 AM 09/18 HADS 1 N Norridge 1.46 in 0315 AM 09/18 CWOP Rolling Meadows 1.45 in 0318 AM 09/18 CWOP 1 ESE Wheeling 1.44 in 0325 AM 09/18 AWS 1 S Lincoln Park - Chicago 1.44 in 0325 AM 09/18 AWS Chicago - Hyde Park 1.43 in 0700 AM 09/18 CoCoRaHs La Grange 1.42 in 0300 AM 09/18 CWOP Burr Ridge 1.42 in 0303 AM 09/18 CWOP Orland Park 1.35 in 0315 AM 09/18 CWOP 1 SSE Lincoln Park - Chicago 1.34 in 0325 AM 09/18 AWS Wheeling - Chicago Exec. Arp 1.22 in 0252 AM 09/18 ASOS Chicago - Midway Airport 1.20 in 0253 AM 09/18 ASOS Chicago - McKinley Park 1.18 in 0325 AM 09/18 URBANET Glenwood 1.14 in 0315 AM 09/18 CWOP Chicago 1.13 in 0310 AM 09/18 CWOP Chicago 1.10 in 0315 AM 09/18 CWOP Harwood Heights 1.07 in 0325 AM 09/18 AWS 1 WNW Logan Square 1.06 in 0324 AM 09/18 URBANET Hickory Hills 1.05 in 0311 AM 09/18 CWOP Inverness 1.03 in 0315 AM 09/18 CWOP 1 SSE East Hazel Crest 1.00 in 0325 AM 09/18 AWS ...DuPage County... Oak Brook - Salt Cr. 2.51 in 0300 AM 09/18 HADS 1 NNE Hinsdale 2.40 in 1200 PM 09/17 Mesonet 2 SE Elmhurst 2.33 in 0700 AM 09/18 CoCoRaHs Salt Cr. - Elmhurst 2.13 in 0320 AM 09/18 HADS 1 NW Villa Park 1.95 in 0700 AM 09/18 CoCoRaHs 1 ESE Villa Park 1.94 in 0700 AM 09/18 CoCoRaHs Burr Ridge 1.76 in 0317 AM 09/18 CWOP Wheaton 1.60 in 0320 AM 09/18 CWOP 4 S Glen Ellyn 1.59 in 0400 PM 09/17 COOP 2 SW Burr Ridge 1.45 in 0700 AM 09/18 CoCoRaHs Bensenville 1.35 in 0325 AM 09/18 AWS 2 S Glen Ellyn 1.19 in 0324 AM 09/18 AWS Naperville 1.08 in 0316 AM 09/18 CWOP York Center 1.07 in 0325 AM 09/18 URBANET 0.7 NW Wood Dale 1.02 in 0305 AM 09/18 HADS Woodridge 1.01 in 0315 AM 09/18 CWOP ...Kankakee County... Grant Park 1.09 in 0315 AM 09/18 CWOP ...Lake County... 2 WSW Lake Forest 2.04 in 0700 AM 09/18 CoCoRaHs 1 ESE Buffalo Grove 1.97 in 0700 AM 09/18 CoCoRaHs Bannockburn 1.92 in 0700 AM 09/18 CoCoRaHs 2 NNE Lake Forest 1.91 in 0700 AM 09/18 CoCoRaHs Libertyville 1.90 in 0700 AM 09/18 CoCoRaHs 1 S Highwood 1.87 in 0700 AM 09/18 CoCoRaHs Deerfield - W. Fork N. Br. C 1.82 in 0310 AM 09/18 HADS 1 N Lake Zurich 1.70 in 0700 AM 09/18 CoCoRaHs 1 W Lake Bluff 1.66 in 0700 AM 09/18 CoCoRaHs Lake Forest 1.55 in 0315 AM 09/18 CWOP Deerfield 1.51 in 0315 AM 09/18 CWOP Lake Bluff 1.33 in 0316 AM 09/18 CWOP Deerfield - N. Br. Chicago R 1.30 in 0310 AM 09/18 HADS Vernon Hills 1.26 in 0316 AM 09/18 CWOP Gurnee - Des Plaines R. 1.23 in 0230 AM 09/18 HADS Libertyville 1.21 in 0317 AM 09/18 CWOP Zion 1.11 in 0315 AM 09/18 CWOP ...Will County... 1 ESE Frankfort 1.94 in 0700 AM 09/18 CoCoRaHs 3 WNW Mokena 1.94 in 0700 AM 09/18 CoCoRaHs 5 ENE Manhattan 1.68 in 0700 AM 09/18 CoCoRaHs 2 SW Mokena 1.62 in 0700 AM 09/18 CoCoRaHs Frankfort 1.58 in 0315 AM 09/18 CWOP 1 ENE Homer Glen 1.46 in 0700 AM 09/18 CoCoRaHs 3 SE New Lenox 1.45 in 0700 AM 09/18 CoCoRaHs Homer Glen 1.35 in 0319 AM 09/18 CWOP New Lenox 1.25 in 0315 AM 09/18 CWOP ...Indiana... ...Lake County... Hammond 4.79 in 0700 AM 09/18 CoCoRaHs 2 W East Chicago 4.53 in 0400 PM 09/17 Mesonet 1 N Hammond 4.36 in 0325 AM 09/18 URBANET 1 W Whiting 1.93 in 0300 PM 09/17 Mesonet 1 NW Hammond 1.90 in 0600 PM 09/17 Mesonet East Chicago - IN Harbor Can 1.12 in 0300 AM 09/18 HADS 1 WNW Dyer 1.11 in 0700 AM 09/18 CoCoRaHs Observations are collected from a variety of sources with varying equipment and exposures. We thank all volunteer weather observers for their dedication. Not all data listed are considered official.
Flooding Reports
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| Flooding in Calumet City. Courtesy of Paul Goddard. | Flooding in Calumet City. Courtesy of Paul Goddard. |
Preliminary Local Storm Report...Summary
National Weather Service Chicago IL
746 AM CDT Mon Sep 18 2023
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0841 AM Flash Flood 2 WNW Chicago Loop 41.89N 87.67W
09/17/2023 Cook IL Public
Report on social media of a flooded viaduct
on Ashland Avenue between Hubbard and Lake
Streets with report of a car under water.
1006 AM Flash Flood 1 SSE Dolton 41.61N 87.59W
09/17/2023 Cook IL Public
Corrects previous flood report from 1 SSE
Dolton. mPING Report: River/Creek
overflowing; Yard/Basement Flooding.
1019 AM Flash Flood Homewood 41.56N 87.66W
09/17/2023 Cook IL Public
Corrects previous flood report from
Homewood. Report from mPING: River/Creek
overflowing; Yard/Basement Flooding.
1025 AM Flash Flood 1 NNW Glenwood 41.55N 87.62W
09/17/2023 Cook IL Public
Corrects previous flood report from 1 NNW
Glenwood. River/Creek overflowing;
Yard/Basement Flooding.
1100 AM Flash Flood 1 ESE Dolton 41.62N 87.57W
09/17/2023 Cook IL Fire Dept/Rescue
Multiple water rescues, including one with 6
people rescued after being trapped in their
vehicle in flood waters.
1135 AM Flash Flood 2 E West Pullman - Chic 41.67N 87.60W
09/17/2023 Cook IL Public
Report on social media of flooded viaducts
at 130th and Torrence as well as 130th and
Doty with cars in water.
1224 PM Flash Flood Homewood 41.56N 87.66W
09/17/2023 Cook IL Public
Street/road flooding; Street/road closed;
Vehicles stranded.
1229 PM Flash Flood 1 SSE Dolton 41.61N 87.59W
09/17/2023 Cook IL Public
River/Creek overflowing; Yard/Basement
Flooding.
1235 PM Flash Flood 1 SW Burnham 41.62N 87.56W
09/17/2023 Cook IL Public
Video on social media showed stranded cars
in moving flooded waters at near Torrence
and Sibley in Calumet City.
1250 PM Flash Flood 1 WNW Hegeswisch - Chic 41.66N 87.57W
09/17/2023 Cook IL Law Enforcement
130th st closed due to flooding from the
Bishop Ford east to Ford Access Rd just west
of Torrence Ave.
0100 PM Flash Flood 2 E West Pullman - Chic 41.67N 87.60W
09/17/2023 Cook IL Broadcast Media
Corrects previous flood report from 2 E West
Pullman - Chicago. Local media reported on
social media police closure at 130th and
Doty Avenue due to flooding.
0110 PM Flash Flood 2 ESE Dolton 41.62N 87.57W
09/17/2023 Cook IL Broadcast Media
Corrects previous flood report from 2 ESE
Dolton. Local media reported via social
media of flooding near Sibley Blvd and
Merrill Avenue in Calumet City.
0130 PM Flash Flood 1 SE Dolton 41.63N 87.59W
09/17/2023 Cook IL Trained Spotter
Drone footage shows widespread and
significant flash flooding across large
portions of Dolton and Calumet City. Street
after street after street completely
submerged with abandoned cars littered about
in the flood waters. Flood waters reaching
and surrounding several homes and apartment
buildings.
&&
$$
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