Scattered showers and storms are expected across portions of the Central and Eastern U.S. through the end of the week. Meanwhile, dangerous heat will intensify across the Desert Southwest and Intermountain West. Hot, dry weather and increasing winds will allow elevated wildfire conditions to return to the northern Intermountain West, where air quality issues persist from ongoing fires. Read More >
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Overview
For detailed information about this flood event, see The Summer 2025 Flash Flood Events in Northern Illinois and Northwestern Indiana, a NWS Technical Paper which details the rainfall, flooding, and impacts, associated with multiple summer 2025 extreme rainfall events.
August 18th Severe Weather
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Preliminary Storm Report Map |
Preliminary Local Storm Report...Summary National Weather Service Chicago IL 127 PM CDT Tue Aug 19 2025 ..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON... ..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE.... ..REMARKS.. 0818 PM Tstm Wnd Gst 3 NNW Plainfield 41.65N 88.22W 08/18/2025 M58 MPH Will IL Trained Spotter 0348 PM Tstm Wnd Dmg Genoa 42.10N 88.69W 08/18/2025 De Kalb IL Emergency Mngr Tree damage around Genoa, north and south of town. Time estimated from radar. 0350 PM Tstm Wnd Dmg 2 NE Genoa 42.12N 88.67W 08/18/2025 De Kalb IL Emergency Mngr Many trees down northeast of Genoa along Ash Road between North State and Illinois Route 23. Damage includes poles, trees and wires. Time estimated from radar. 0352 PM Tstm Wnd Dmg 2 E Genoa 42.10N 88.65W 08/18/2025 De Kalb IL Emergency Mngr Large tree across the whole road, Illinois 23 north of Illinois 72, northeast of Genoa. Time estimated from radar. 0406 PM Tstm Wnd Dmg 4 WNW Sycamore 42.01N 88.75W 08/18/2025 De Kalb IL Emergency Mngr Three power poles down on Old State Road between Five Points Road and Church Rd west of Sycamore. Time estimated from radar. && $$ |
August 18th Heavy Rain and Flash Flooding
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Flash Flood Reports:
Preliminary Local Storm Report...Summary
National Weather Service Chicago IL
359 PM CDT Tue Aug 19 2025
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0835 PM Flash Flood 1 WSW Gary Airport 41.61N 87.44W
08/18/2025 Lake IN Public
Multiple public reports on social media of
basement flooding in East Chicago. Video
shows nearby street and yard flooding.
0835 PM Flash Flood 2 SSE Whiting 41.66N 87.48W
08/18/2025 Lake IN Public
US 20 closed due to flooding. Relayed via
social media.
0841 PM Flash Flood 1 SSE Whiting 41.66N 87.48W
08/18/2025 Lake IN Emergency Mngr
Indianapolis Blvd at 128th has about 3 feet
of water and is being closed to traffic.
0930 PM Flash Flood Whiting 41.69N 87.50W
08/18/2025 Lake IN Local Official
Combined sewer storage facility exceeded
capacity and overflowed due to heavy
rainfall. Relayed via broadcast media. Time
estimated based upon nearby reports.
0930 PM Flash Flood 1 WSW Whiting 41.68N 87.51W
08/18/2025 Lake IN Local Official
Multiple basements flooded in Hammond. Time
estimated based upon nearby reports. Relayed
via broadcast media.
0945 PM Flash Flood 2 SSE Gary Airport 41.59N 87.40W
08/18/2025 Lake IN Public
Public reports of basement flooding in Gary.
Time estimated based upon nearby reports.
0946 PM Flash Flood 2 E Hammond 41.59N 87.46W
08/18/2025 Lake IN Public
Public report of basement flooding in
Hessville neighborhood of Hammond near
Morton Elementary.
1000 PM Flash Flood Whiting 41.68N 87.50W
08/18/2025 Lake IN Public
Up to 3 feet of water on Indianapolis
Boulevard from 120th to 129th and the areas
of Dickey and Riley roads.
0633 PM Flash Flood 2 NE Roscoe 42.44N 88.99W
08/18/2025 Winnebago IL Public
Report relayed from mPING of street
flooding.
0725 PM Flash Flood 2 E Rockton 42.46N 89.04W
08/18/2025 Winnebago IL Public
Public report of street flooding near
Rockton Road and Dorr Road. Flooding
extending into nearby yards.
0652 PM Flash Flood Lockport 41.59N 88.05W
08/18/2025 Will IL Public
Report relayed from mPING of street
flooding.
0716 PM Flash Flood 1 SE Lockport 41.58N 88.05W
08/18/2025 Will IL Public
Report relayed from mPING of street
flooding.
0735 PM Flash Flood 2 SE Lockport 41.57N 88.03W
08/18/2025 Will IL Public
Report relayed from mPING of street
flooding.
0738 PM Flash Flood 2 E Mokena 41.54N 87.84W
08/18/2025 Will IL Public
Report relayed from mPING of street
flooding.
0755 PM Flash Flood 2 NE Mokena 41.55N 87.85W
08/18/2025 Will IL Public
At least 6 inches of water in underpass
under railroad tracks.
0900 PM Flash Flood 3 NW Bolingbrook 41.73N 88.12W
08/18/2025 Will IL NWS Employee
1 to 1.5 feet of standing water at the
intersection of Naper Blvd and 87th Street.
Around 1 foot of water on roads encroaching
on driveways in surrounding neighborhoods,
and at least 6 inches of flowing water at
Arlington and Riverwoods.
0910 PM Flash Flood Joliet 41.53N 88.08W
08/18/2025 Will IL Public
Reports of standing or flowing water on many
streets or intersections of Joliet.
1000 PM Flash Flood 2 ENE Mokena 41.54N 87.84W
08/18/2025 Will IL Public
Up to 3 feet of water on roadway.
1241 AM Flash Flood 2 E Mokena 41.54N 87.84W
08/19/2025 Will IL Public
Several reports from mPing of flooded and
closed roads in Mokena.
0600 PM Flash Flood Compton 41.69N 89.09W
08/18/2025 Lee IL Public
Video shared to social media shows several
inches of flowing water on roadways and a
parking lot in Compton.
0730 PM Flash Flood 1 N Paw Paw 41.71N 88.98W
08/18/2025 Lee IL Public
Report on social media of Paw Paw Road
flooded approximately half mile north of Paw
Paw. Possibly near creek crossing at Dredge
Road.
0730 PM Flash Flood 1 NW La Salle 41.34N 89.10W
08/18/2025 La Salle IL Public
Report relayed from mPING of street
flooding.
0800 PM Flash Flood 2 SE Yorkville 41.62N 88.43W
08/18/2025 Kendall IL Public
Street flooded with at least 6 inches of
standing water.
0809 PM Flash Flood 1 S Oswego 41.67N 88.36W
08/18/2025 Kendall IL Public
Report relayed from mPING of street
flooding.
0535 PM Flash Flood 2 NNE Woodridge 41.78N 88.04W
08/18/2025 DuPage IL NWS Employee
In Downers Grove, 6-8 inches of water
flowing over the road at Belmont near 59th
Street.
0610 PM Flash Flood 1 W Downers Grove 41.79N 88.02W
08/18/2025 DuPage IL Public
Report relayed from mPING of street
flooding.
0625 PM Flash Flood 1 NW Darien 41.76N 87.98W
08/18/2025 DuPage IL Public
Report on social media with photos showing
4-6 inches of water on Washington Street in
Darien, with flooding also impacting houses.
0836 PM Flash Flood 1 E Downers Grove 41.79N 88.00W
08/18/2025 DuPage IL Public
Report relayed from mPING of street
flooding.
0837 PM Flash Flood 3 NW Bolingbrook 41.73N 88.10W
08/18/2025 DuPage IL Public
Report relayed from mPING of street
flooding.
0910 PM Flash Flood 1 SSE Naperville 41.76N 88.14W
08/18/2025 DuPage IL Public
1 to 2 feet of water reported on Gartner
Road with vehicles stranded. Unclear exactly
where on Garner Road this is occurring.
0640 PM Flash Flood 3 E Paw Paw 41.69N 88.93W
08/18/2025 De Kalb IL Public
Video posted to social media shows at least
a foot of flowing water over Chicago Road
east of Paw Paw.
0741 PM Flash Flood 2 S Orland Hills 41.57N 87.84W
08/18/2025 Cook IL Public
Report relayed from mPING of street
flooding.
0807 PM Flash Flood 1 SE Orland Hills 41.57N 87.83W
08/18/2025 Cook IL Public
Report relayed from mPING of street
flooding.
0809 PM Flash Flood 2 W Orland Hills 41.59N 87.88W
08/18/2025 Cook IL Public
Report relayed from mPING of street
flooding.
0815 PM Flash Flood 1 NE Tinley Park 41.59N 87.78W
08/18/2025 Cook IL Public
A few public reports of basement flooding in
Tinley Park. Relayed via social media.
Photos and videos show flooded roadways with
at least several inches of flowing water in
the vicinity. Time estimated based upon
nearby reports.
0834 PM Flash Flood 1 W Midlothian 41.63N 87.73W
08/18/2025 Cook IL Public
Report relayed from mPING of street
flooding.
1000 PM Flash Flood Thornton 41.58N 87.62W
08/18/2025 Cook IL Public
2 lanes covered in water near the quarry on
I294.
1244 AM Flash Flood 2 S Orland Hills 41.57N 87.84W
08/19/2025 Cook IL Public
Several reports from from mPING of flooded
streets.
0600 AM Flash Flood 3 WNW Orland Park 41.63N 87.90W
08/19/2025 Cook IL Law Enforcement
143rd Street closed due to flooding near
Creek Crossing Drive. Relayed via social
media.
0600 AM Flash Flood 3 WSW Orland Hills 41.58N 87.89W
08/19/2025 Cook IL Law Enforcement
Wolf Road flooded near 167th Street near
Marley Creek crossing. Relayed via social
media.
&&
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August 16th Through the 19th: 3-Day Rainfall Totals
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Selected Rainfall Reports:
Public Information Statement National Weather Service Chicago IL 1127 AM CDT Tue Aug 19 2025 ...PRECIPITATION TOTALS SINCE AUGUST 16, 2025... Location Amount Time/Date Provider ...Illinois... ...Cook County... Oak Forest 1 NNW 6.60 in 0700 AM 08/19 COCORAHS Lansing 2 S 5.72 in 0700 AM 08/19 COOP Matteson 0.9 E 5.72 in 0700 AM 08/19 COCORAHS Crestwood 0.4 SW 5.70 in 0720 AM 08/19 COCORAHS Flossmoor 1 SE 5.35 in 0700 AM 08/19 COCORAHS Midlothian 5.26 in 0700 AM 08/19 COCORAHS Elk Grove Village 2 WSW 5.05 in 0805 AM 08/19 COCORAHS Midlothian 1 SSE 5.04 in 0800 AM 08/19 COCORAHS Elk Grove Village 1 ESE 4.99 in 0700 AM 08/19 COCORAHS Homewood 4.76 in 0700 AM 08/19 COCORAHS Park Forest 1 WNW 4.73 in 0730 AM 08/19 COCORAHS Lansing Airport 4.69 in 0955 AM 08/19 AWOS Palos Park 2 WSW 4.63 in 0700 AM 08/19 COCORAHS Park Forest 1 NNE 4.58 in 0700 AM 08/19 COCORAHS Hoffman Estates 4.42 in 0700 AM 08/19 COCORAHS Arlington Heights 1 W 4.42 in 0700 AM 08/19 COCORAHS Barrington 3 SW 4.26 in 0800 AM 08/19 COOP Chicago OHare 4.17 in 0951 AM 08/19 ASOS Schaumburg 2 E 4.14 in 0700 AM 08/19 COCORAHS Merrionette Park - 1 WSW 4.10 in 0700 AM 08/19 COCORAHS La Grange Park 1 SSW 4.09 in 0700 AM 08/19 COCORAHS Hoffman Estates 2.5 NNE 4.01 in 0756 AM 08/19 COCORAHS South Holland - Little Calum 4.01 in 0945 AM 08/19 MESONET Park Forest 4.00 in 0500 AM 08/19 COOP ...DuPage County... Downers Grove 1.8 SSE 5.33 in 0700 AM 08/19 COCORAHS Aurora 4 ESE 5.08 in 0700 AM 08/19 COCORAHS Naperville 3 SE 5.06 in 0700 AM 08/19 COCORAHS Clarendon Hills 5.05 in 0700 AM 08/19 HYDRO Westmont 1.1 SSW 5.02 in 0700 AM 08/19 COCORAHS Bartlett 1.1 SE 4.88 in 0700 AM 08/19 COCORAHS Naperville 3 SE 4.87 in 0700 AM 08/19 COCORAHS Aurora 4 ESE 4.87 in 0700 AM 08/19 COCORAHS Aurora 4 ESE 4.87 in 0800 AM 08/19 COCORAHS Carol Stream 4.80 in 0700 AM 08/19 COCORAHS Morton Arboretum 4.43 in 0700 AM 08/19 COOP Warrenville - W. Br. DuPage 4.04 in 0925 AM 08/19 MESONET Bolingbrook 2.6 NE 4.00 in 0800 AM 08/19 COCORAHS ...Grundy County... Minooka 4.74 in 0800 AM 08/19 COCORAHS ...Kane County... Aurora 6.05 in 1009 AM 08/19 CWOP Sugar Grove 1 NNW 5.67 in 0700 AM 08/19 COCORAHS North Aurora 2 SW 5.49 in 0800 AM 08/19 COCORAHS Aurora 2 W 5.43 in 0700 AM 08/19 COCORAHS Montgomery - Blackberry Cr. 5.37 in 0930 AM 08/19 MESONET Batavia 3.4 WSW 4.82 in 0600 AM 08/19 COCORAHS Aurora 4.64 in 0700 AM 08/19 COOP North Aurora 4.53 in 0735 AM 08/19 COCORAHS ...Kendall County... Oswego 8.54 in 0505 AM 08/19 COCORAHS Oswego 7.61 in 1000 AM 08/19 CWOP Oswego 3 NW 7.56 in 0700 AM 08/19 COCORAHS Oswego 1 SSE 7.36 in 0600 AM 08/19 COCORAHS Boulder Hill 6.74 in 0615 AM 08/19 COCORAHS Boulder Hill 1 NNE 6.71 in 0700 AM 08/19 COCORAHS Plainfield 4 SW 6.19 in 0700 AM 08/19 COCORAHS Yorkville 4.5 N 5.66 in 0700 AM 08/19 COCORAHS Yorkville 0.9 SSW 5.42 in 0700 AM 08/19 COCORAHS Yorkville 3.1 N 5.15 in 0643 AM 08/19 COCORAHS Yorkville 3.0 N 4.97 in 0740 AM 08/19 COCORAHS Yorkville 1.7 SSE 4.68 in 0700 AM 08/19 COCORAHS Yorkville 1.0 N 4.36 in 0700 AM 08/19 COCORAHS ...Lee County... Paw Paw 2 S 6.13 in 0700 AM 08/19 COOP West Brooklyn 4.3 WNW 4.02 in 0800 AM 08/19 COCORAHS ...McHenry County... Bull Valley 2 WNW 5.53 in 0800 AM 08/19 COCORAHS Harvard 4.4 NNE 5.16 in 0633 AM 08/19 COCORAHS Woodstock 4 SW 4.84 in 0745 AM 08/19 COCORAHS ...Will County... Lockport - Chicago Ship Cana 6.71 in 0915 AM 08/19 MESONET Rockdale 1 NW 6.62 in 0700 AM 08/19 COCORAHS Shorewood 6.56 in 0700 AM 08/19 COCORAHS 2 NW Plainfield 6.51 in 1005 AM 08/19 CWOP Plainfield 3 NNW 6.35 in 0700 AM 08/19 COCORAHS Joliet 3 WNW 6.09 in 0700 AM 08/19 COCORAHS Joliet 2.7 NW 6.06 in 0600 AM 08/19 COCORAHS 2 NW Plainfield 6.00 in 0700 AM 08/19 COCORAHS Plainfield 3 ESE 5.94 in 0900 AM 08/19 COCORAHS Mokena 4 WNW 5.88 in 0600 AM 08/19 COCORAHS Joliet 0.8 E 5.72 in 0600 AM 08/19 COCORAHS Homer Glen 1 NNE 5.72 in 0600 AM 08/19 COCORAHS Mokena 1 W 5.64 in 0700 AM 08/19 COCORAHS Plainfield 3.9 SSW 5.55 in 0605 AM 08/19 COCORAHS Plainfield 1.7 WNW 5.42 in 0700 AM 08/19 COCORAHS Shorewood - DuPage R. 5.39 in 0945 AM 08/19 MESONET Mokena 2 SW 5.38 in 0700 AM 08/19 COCORAHS New Lenox 2 NE 5.32 in 0800 AM 08/19 COCORAHS Romeoville - NWS Chicago 5.31 in 0700 AM 08/19 NWS OBS Naperville 5 SSW 5.31 in 0700 AM 08/19 COCORAHS Plainfield 2 SSE 5.22 in 0700 AM 08/19 COCORAHS Homer Glen 2 NNE 5.19 in 0700 AM 08/19 COCORAHS Mokena 2 WSW 4.88 in 0700 AM 08/19 COCORAHS Naperville 4 S 4.59 in 0700 AM 08/19 COCORAHS Crete 3 ENE 4.51 in 0700 AM 08/19 COCORAHS Crete 3 E 4.43 in 0700 AM 08/19 COCORAHS New Lenox 1 SSE 4.37 in 0700 AM 08/19 COCORAHS Naperville 4 SE 4.35 in 0800 AM 08/19 COCORAHS DuPage R. near Plainfield 4.29 in 0945 AM 08/19 MESONET Frankfort 1 ESE 4.28 in 0700 AM 08/19 COCORAHS New Lenox 1 SE 4.27 in 0800 AM 08/19 COCORAHS ...Winnebago County... South Beloit 2 SE 5.12 in 0700 AM 08/19 COCORAHS ...Indiana... ...Lake County... Dyer - Hart Ditch 6.59 in 1000 AM 08/19 MESONET Hammond 2 N 6.37 in 0600 AM 08/19 COCORAHS Gary 5.9 ENE 6.09 in 0700 AM 08/19 COCORAHS Gary 5 ENE 5.76 in 0700 AM 08/19 COCORAHS Munster - Hart Ditch 5.72 in 1000 AM 08/19 MESONET Hobart 1.1 S 5.23 in 0700 AM 08/19 COCORAHS Gary 6.2 ENE 5.08 in 0800 AM 08/19 COCORAHS Highland 1 SW 4.98 in 0700 AM 08/19 COCORAHS Hobart 2.4 SE 4.67 in 0830 AM 08/19 COCORAHS Dyer 4.31 in 0800 AM 08/19 COCORAHS Munster - Little Calumet R. 4.29 in 1000 AM 08/19 MESONET 2 SE Tinley Park 4.15 in 0955 AM 08/19 CWOP ...Porter County... Ogden Dunes 6.28 in 0555 AM 08/19 COCORAHS Portage 3 E 5.50 in 0700 AM 08/19 COCORAHS Lakes of the Four Seasons 4.48 in 0830 AM 08/19 COCORAHS Valparaiso 2.8 W 4.05 in 0810 AM 08/19 COCORAHS Porter 4.03 in 0700 AM 08/19 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. $$ |
More information on the events of August 16th and 17th can be found here.
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Media use of NWS Web News Stories is encouraged! Please acknowledge the NWS as the source of any news information accessed from this site. Additional event recaps can be found on the NWS Chicago Past Events Page |
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