Scattered thunderstorms produced isolated wind damage and isolated flooding during the evening of June 24th.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS LOT wrote it up.
Scattered thunderstorms produced isolated wind damage and isolated flooding during the evening of June 24th.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Chicago, IL wrote its last area forecast discussion before the first event at Jun 24, 5:35 PM CST, 1 hour 29 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 635 PM CDT Wed Jun 24 2026 .KEY MESSAGES... - Scattered thunderstorms expected this afternoon and evening, a few may be severe with large hail and damaging winds. - Another chance of showers and possibly a few thunderstorms during the day Friday, with another chance of showers and thunderstorms Saturday night perhaps into early Sunday morning. - First heat wave of the summer expected early next week with the potential for highs in the 90s and peak afternoon heat indices over 100 degrees. && .DISCUSSION... Issued at 146 PM CDT Wed Jun 24 2026 Shortwave trough over the western Great Lakes along with associated weak sfc front from northwest Wisconsin south into eastern Iowa should encourage scattered thunderstorm development this afternoon. These storms should move southeastward across our CWA late this afternoon into this evening. Jet streak is evident on water vapor imagery nosing into SE MN/SW WI early this afternoon. Guidance depicts a 40-50kt 500mb speed max spreading across southern WI and northern IL this afternoon and evening. This will result in a increase in deep layer shear into the 40kt range. Rain associated with lead shortwave should continue to exit the area early this afternoon with at least partial clear already spreading into our far western CWA. This should allow for moderate instability to develop across the area with MLCAPES of 1000-1500 J/kg. The moderate instability coupled with fairly strong deep layer shear should support supercells with a potential for large hail and perhaps damaging winds. Weak mid level lapse rates may limit the magnitude of the hail/wind threat, but the long straight hodographs would support splitting supercells and a hail threat. This front should clear the CWA late this evening bringing an end to the showers/storms by late evening. In the wake of the front, looks for dry weather Thursday and most of Thursday night. There is a signal in most guidance for another low amplitude shortwave to potentially becoming convectively enhanced before moving toward the mid Mississippi Valley Friday. Instability should be pushed well south of our CWA, so if this MCV takes a more northerly track it would likely be in a weakening state as it encounters more stable and drier low level air mass over our area Friday. Conversely, it is possible that the MCV may tend to propagate more southward toward the instability gradient. In collaboration with neighboring offices, lowered NBM pops for Friday some and kept slight thunder chances confined to areas south of the Kankakee/Illinois Rivers. Cloud cover should keep temps cooler Friday, but if it does rain then highs would need to be lowered even more, especially southern CWA where better rain chances should be. Over the weekend, an upper level ridge is progged to begin developing over the middle and lower Mississippi Valley region. A warm front is progged to lift northward Saturday night into Sunday. Some threat of showers and thunderstorms will exist ahead of this front and ahead of the EML advecting eastward with the developing upper ridge. Medium range guidance is in good agreement in developing a fairly strong (595-596dm) 500mb ridge over the Mississippi Valley early next week. Sunday, there's likely a small chance of showers/storms in the morning, then probably dry in the afternoon. With the warm front moving through the area, a weak lake breeze is possible along the IL shore perhaps offering a bit cooler conditions right along the lake. Elsewhere, highs should climb into the upper 80s to around 90 with higher dewpoints likely pushing afternoon heat indices well into the 90s to near 100. Monday through Wednesday, current forecast has highs in the low to mid 90s with dewpoints in the 70s resulting in heat indices solidly over 100 degrees. Based on the current model guidance, these values are reasonable, but with the heart of the upper ridge progged to be centered south toward the lower Ohio and mid-lower Mississippi Valley it is possible that ring of fire convection currently progged to be mostly to our north could sneak farther south or send outflow south into parts of our area offering some reprieve from the heat. Harder to forecast that this far out, but something to watch as a possible spoiler to what otherwise looks like the first formidable heat wave of the summer. - Izzi && .AVIATION /00Z TAFS THROUGH 06Z FRIDAY/... Issued at 635 PM CDT Wed Jun 24 2026 Forecast concerns include... Scattered thunderstorms this evening. Wind shift/lake breeze to northeast Thursday evening. A line of strong/severe thunderstorms will move across the Chicago terminals in the next 1-2 hours. Another line of thunderstorms across southwest WI and far northwest IL may move across the terminals during the mid/late evening. Have maintained prob thunder mention for this potential for now. Prevailing southeast winds are expected to continue this evening and may become more easterly behind the first round of storms. Winds are expected to shift light westerly overnight, then west/ northwest to 10kt Thursday morning. A lake breeze/cold front is expected to shift winds to the northeast late Thursday afternoon into early Thursday evening for the Chicago terminals. cms && .LOT WATCHES/WARNINGS/ADVISORIES... IL...None. IN...None. LM...None. && Visit us at weather.gov/chicago
Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
217 PM CDT Wed Jun 24 2026
ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-251930-
Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-
La Salle-Kendall-Grundy-Kankakee-Livingston-Iroquois-Ford-
Northern Cook-Central Cook-Southern Cook-Northern Will-
Southern Will-Eastern Will-Lake IN-Porter-Newton-Jasper-Benton-
217 PM CDT Wed Jun 24 2026 /317 PM EDT Wed Jun 24 2026/
This Hazardous Weather Outlook is for portions of north central
Illinois...northeast Illinois and northwest Indiana.
.DAY ONE...Tonight.
Weather hazards expected...
Elevated Thunderstorm Risk...with an associated:
Level 2 of 5 Damaging Wind Risk...up to 60 mph.
Level 2 of 5 Large Hail Risk...up to ping pong ball size.
DISCUSSION...
Scattered thunderstorms are expected this afternoon and evening.
A couple of the storms could become severe with large hail and
damaging winds the primary threat.
.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.
Friday...
Limited Thunderstorm Risk south of I-80.
Saturday night and Sunday morning...
Limited Thunderstorm Risk.
Monday...
Elevated Excessive Heat Risk.
Tuesday...
Limited Thunderstorm Risk.
Elevated Excessive Heat Risk.
.SPOTTER INFORMATION STATEMENT...
Spotters may be needed through this evening.
GENERAL STORM MOTION OF THE DAY:
Moving toward the southeast 30 mph, isolated storms may move
northeast up to 40 mph.
LMZ740>745-251930-
Winthrop Harbor to Wilmette Harbor IL-
Wilmette Harbor to Northerly Island IL-
Northerly Island to Calumet Harbor IL-
Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN-
Burns Harbor to Michigan City IN-
217 PM CDT Wed Jun 24 2026
This Hazardous Weather Outlook is for portions of the Illinois
nearshore waters of Lake Michigan and the Indiana nearshore
waters of Lake Michigan.
.DAY ONE...Tonight.
Weather hazards expected...
Elevated Thunderstorm Risk...with an associated:
Level 2 of 5 Thunderstorm Wind Gust Risk...up to 50 knots.
Level 2 of 5 Hail Risk...up to ping pong ball size.
.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.
Saturday night into Sunday morning...
Limited Thunderstorm Risk.
Tuesday...
Limited Thunderstorm Risk.
- Izzi
Visit us at www.weather.gov/chicagoPreliminary Local Storm Report
National Weather Service Chicago IL
705 PM CDT Wed Jun 24 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0640 PM Tstm Wnd Dmg 2 S Hanover Park 41.98N 88.14W
06/24/2026 DuPage IL Trained Spotter
Six inch diameter tree limb blown down on
Ring Court.
&&Preliminary Local Storm Report
National Weather Service Chicago IL
712 PM CDT Wed Jun 24 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0613 PM Tstm Wnd Dmg West Dundee 42.10N 88.28W
06/24/2026 Kane IL Emergency Mngr
Kane County EMA reported multiple large
branches downed near Barrington Avenue and
Water Street in East Dundee. Time estimated
by radar.
&&
WSLPreliminary Local Storm Report
National Weather Service Chicago IL
713 PM CDT Wed Jun 24 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0650 PM Flood Hanover Park 42.00N 88.14W
06/24/2026 Cook IL Public
Multiple public reports of street flooding
near Hanover Park. Relayed via mping.
&&
WSLPreliminary Local Storm Report
National Weather Service Chicago IL
730 PM CDT Wed Jun 24 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0710 PM Flood Addison 41.93N 87.99W
06/24/2026 DuPage IL Public
Photo shows several inches of standing water
on a residential street in Addison.
&&Preliminary Local Storm Report
National Weather Service Chicago IL
734 PM CDT Wed Jun 24 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0715 PM Tstm Wnd Gst 3 SE Grand Ridge 41.21N 88.78W
06/24/2026 M53 MPH La Salle IL Public
Private weather station reported 53 mph gust
southeast of Grand Ridge. Time approximate.
&&
WSLPreliminary Local Storm Report
National Weather Service Chicago IL
742 PM CDT Wed Jun 24 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0725 PM Flood River Grove 41.93N 87.84W
06/24/2026 Cook IL Public
Video shared to social media shows a few
inches of standing water on Grand Avenue
near Forest Avenue.
&&
WSLThe Chicago radar (KLOT), 48 km away, was scanning. The volume nearest the first event began at 01:03 UTC.
6 thunderstorm wind, 3 flood, 1 hail, 1 flash flood. Local standard time, as filed.
Tree and power line damage was reported in neighborhoods near Chicago Street and Calumet Avenue.
Video showed multiple large tree limbs blown down and at least one tree uprooted in Kosciuszko Park.
A tree limb was blown down onto power lines near Carolina Avenue and 167th Street.
Video showed dime to quarter size hail near Ridge Road and 5th Street.
Multiple tree limbs were blown down.
Widespread tree and power line damage occurred in Griffith. A photo showed a large uprooted tree near Brinwood Drive and Arbogast Street. Tree limbs were blown down on Indiana Street, Elmer Street and along Broad Street near Main Street. At least one tree fell onto a house, damaging the second floor.
Multiple tree limbs were blown down onto Ridge Road near Clark Road.
Multiple roads were flooded with a few inches of water on the south side of Gary.
Video showed street flooding near Shell Street and Wegg Avenue.
Standing water was reported on Interstate 80 near Kennedy Avenue.
Flash flooding occurred in Merrillville, Crown Point, Schererville and surrounding areas. Route 30 was flooded at the underpass near Indianapolis Boulevard. A photo showed cars stalled in flood waters on Route 30 near Mississippi Street. Route 30 was flooded near Taft Street. Broadway Street was flooded near 61st Street. Basement flooding was reported in Griffith, in part due to widespread power outages and sump pumps not working. A personal weather station south of Merrillville measured 3.10 inches of rain in one hour.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Indiana in 2026Every state in 2026This day in weather historyWarnings in Indiana, June 2026
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1349428, 1349429, 1349427, 1349426, 1349431, 1349430, 1349433, 1349441, 1349446, 1349448, 1349451.