Within a cluster of sub-severe thunderstorms, one supercell stood out among the rest producing damaging winds, large hail, and torrential rainfall as it moved across DeKalb and Kane counties during the afternoon of the 8th.
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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.
Within a cluster of sub-severe thunderstorms, one supercell stood out among the rest producing damaging winds, large hail, and torrential rainfall as it moved across DeKalb and Kane counties during the afternoon of the 8th.
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 8, 1:14 PM CST, 1 minute earlier. Its key messages:
Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 214 PM CDT Sun Jun 8 2025 .KEY MESSAGES... - Isolated to scattered showers and thunderstorms will continue to move through the area this afternoon. Another round of scattered showers and storms is expected again tomorrow afternoon. - A few instances of pea to nickel size hail as well as 40 to 50 mph winds may occur with the strongest storms this afternoon and tomorrow. - A period of dry and warmer weather is expected midweek. - Shower and thunderstorm chances return late in the week. && .DISCUSSION... Issued at 214 PM CDT Sun Jun 8 2025 Through Monday: Recent satellite imagery and surface observations depict a cold front moving east across northern Illinois at press time. Temperatures in the mid to upper 70s and surface dew points in the lower 60s are contributing to around 1000 J/kg of MLCAPE along the front, which will continue to support isolated to scattered storms as the front pushes across the area through this evening. Kinematic profiles characterized by weak low-level shear/storm relative inflow but strong mid-level shear will maintain mini-supercell structures with an attendant threat for pea to nickel size hail and gusty winds to 50 mph. The threat for storms will end from west to east this afternoon behind the front, tapering in northwestern Indiana by 8 to 9 PM. Behind the front, a quick hit of gusty westerly winds is expected thanks to a local tightening of the surface pressure gradient (have noted a few gusts as high as 35 mph in eastern Iowa). In addition, scattered showers may develop and continue behind the front through the early overnight hours as a jet streak moves overhead, as well. Clouds will attempt to clear from west to east overnight, allowing for temperatures to quickly cool into the 50s by daybreak. Tomorrow, attention will be on the sharp upper-level shortwave currently racing southward from southern Canada into North Dakota as it propagates into the Lower Great Lakes. Relatively cold 500mb temperatures of -20 to -22C will support steepening mid-level lapse rates as the shortwave approaches, allowing for a band of showers and thunderstorms to develop and sweep across the area from late morning through early afternoon. Relatively low freezing levels and a strengthening low-level wind field will allow for the strongest storms to produce pea to nickel size hail and locally strong wind gusts to 50 mph. Outside of showers and storms tomorrow, highs will range from the upper 60s (northwest) to mid 70s (southeast) amidst breezy west winds. Borchardt Monday Night through Sunday: Our thoughts for the long term portion of the forecast period have not changed. The upper-level flow pattern will begin to deamplify on Tuesday as the Great Lakes trough/low ejects into southeastern Canada. Rising heights in its wake will result in the development of a quasi-zonal type flow pattern across the northern CONUS for the second half of the week. The main result of this changing weather pattern for our weather will be the turn from seasonably cool conditions on Tuesday (highs in the 70s) to much warmer temperatures (highs back in the 80s) by Wednesday. Primarily dry weather is anticipated for Tuesday and Wednesday, and it is certainly plausible that most of our area will remain free of precipitation and very warm through the end of the work week. In spite of this, the official forecast will begin to carry some chances (~30-50%) for showers and thunderstorms during the Wednesday night through Friday timeframe. However, storm chances during this period will ultimately be dependent upon how far south a west-to-east oriented surface cold frontal boundary reaches before stalling ahead of the next impulse shifting into the Dakotas late in the week. If this front ends up stalling to our north across WI, the primary focus for waves of showers and storms Wednesday night through much of Friday would also likely largely remain to our north in WI. However, due to the inherent uncertainties at this time range, we made no changes to the NBM POPs. Another feature that will need to be monitored for driving storm chances later next week is the southern stream impulse that is expected to slowly migrate its way eastward from the Desert Southwest on Tuesday into the Ozarks region into early next weekend. This feature will also be a daily driver of showers and thunderstorms, but with it's slow eastward movement, much (if not all) of the thunderstorm activity will remain south and southwest of our area through the end of the week. Ultimately, our best shot at a period of higher coverage storms may end up coming sometime next weekend (possibly on Saturday?) as the late week system moving across the Dakotas finally looks to drive the surface cold front southward across our area. Unfortunately, the specifics with timing this far out are of low confidence. Stay tuned. KJB && .AVIATION /18Z TAFS THROUGH 00Z TUESDAY/... Issued at 103 PM CDT Sun Jun 8 2025 Key Messages: - Scattered thunderstorms this afternoon. - Scattered thunderstorms expected again tomorrow afternoon. A broken line of showers and thunderstorms has begun to develop along a cold front that crossed the Mississippi River just before press time. These showers/storms will track eastward along with the cold front and affect RFD through 20Z and the Chicago metro terminals from west to east between about 1930Z and 0000Z. The strongest storms will likely produce gusty winds in excess of 30 kts and brief MVFR or IFR conditions. Scattered showers may then continue through the late afternoon/early afternoon after the primary lightning threat window before dry conditions return for good by the mid-late evening. Another round of scattered showers and thunderstorms is expected again tomorrow afternoon (possibly beginning during the late morning at RFD) along and behind a reinforcing cold front. Tomorrow's storms should have an overall similar character to today's and primarily be focused during a 2-3 hour time window with scattered showers again likely to persist in the area for a few hours after the main window for thunderstorms. Otherwise, winds will largely be out of the west to southwest throughout the TAF period. Gusts in excess of 20 kts will occur during the daytime, possibly briefly approaching 30 kts behind the cold frontal passages today and tomorrow. A renewed wave of Canadian wildfire smoke is also expected to arrive this evening from the west. Confidence in near-surface smoke making it here in high enough concentrations to produce notable visibility reductions was too low to include in the TAFs, but upstream observations across Iowa and northwestern Illinois will need to be monitored, and it can't be ruled out at this time that 6SM or lower visibilities from haze or smoke will be observed tonight into tomorrow. Ogorek && .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
1127 AM CDT Sun Jun 8 2025
ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-091630-
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-
1127 AM CDT Sun Jun 8 2025 /1227 PM EDT Sun Jun 8 2025/
This Hazardous Weather Outlook is for portions of north central
Illinois...northeast Illinois and northwest Indiana.
.DAY ONE...This Afternoon and Tonight.
Weather hazards expected...
Limited Thunderstorm Risk...with an associated:
Level 1 of 5 Damaging Wind Risk...up to 60 mph.
Level 1 of 5 Large Hail Risk...up to 1 inch in diameter.
DISCUSSION...
Scattered showers and thunderstorms will develop ahead of a cold
front this afternoon through early evening. The strongest storms
will be capable of gusty to locally damaging winds and small
hail.
.DAYS TWO THROUGH SEVEN...Monday through Saturday.
Monday...
Limited Thunderstorm Risk.
Thursday Through Saturday...
Limited Thunderstorm Risk.
.SPOTTER INFORMATION STATEMENT...
Spotters may be needed this afternoon.
GENERAL STORM MOTION OF THE DAY:
Moving toward the east southeast at 35 mph.
LMZ740>745-091630-
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-
1127 AM CDT Sun Jun 8 2025
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...This Afternoon and Tonight.
Weather hazards expected...
Limited Thunderstorm Risk...with an associated:
Level 1 of 5 Thunderstorm Wind Gust Risk...up to 50 kt.
Level 1 of 5 Hail Risk...up to 1 inch in diameter.
.DAYS TWO THROUGH SEVEN...Monday through Saturday.
Monday...
Limited Thunderstorm Risk.
Thursday Through Saturday...
Limited Thunderstorm Risk.
Borchardt
Visit us at www.weather.gov/chicagoPreliminary Local Storm Report
National Weather Service Chicago IL
1037 AM CDT Sun Jun 8 2025
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0700 AM Rain 4 E Dayton 41.38N 88.72W
06/08/2025 M2.59 Inch La Salle IL Mesonet
Personal weather station KILMARSE23.
Rainfall total from Saturday night.
0300 AM Rain 1 NNW Marseilles 41.35N 88.72W
06/08/2025 M2.32 Inch La Salle IL Mesonet
Personal weather station KILMARSE17.
Rainfall total from Saturday night.
0300 AM Rain 3 N Leland 41.66N 88.80W
06/08/2025 M2.27 Inch De Kalb IL Mesonet
Personal weather station KILLELAN7. Rainfall
total from Saturday night.
0600 AM Rain 5 NNE Earlville 41.65N 88.89W
06/08/2025 M2.08 Inch De Kalb IL Cocorahs
Cocorahs station IL-DK-29 Earlville 5 NNE.
Rainfall total from Saturday night.
0700 AM Rain Amboy 41.71N 89.33W
06/08/2025 M1.44 Inch Lee IL Cocorahs
Cocorahs station IL-LE-27 Amboy. Rainfall
total from Saturday night.
0503 AM Rain 1 WSW Amboy 41.71N 89.34W
06/08/2025 M1.31 Inch Lee IL Cocorahs
Cocorahs station IL-LE-22 Amboy 1 WSW.
Rainfall total from Saturday night.
&&Special Weather Statement
National Weather Service Chicago/Romeoville
132 PM CDT Sun Jun 8 2025
ILZ008-011-081900-
De Kalb IL-Ogle IL-
132 PM CDT Sun Jun 8 2025
...A STRONG THUNDERSTORM WILL IMPACT SOUTHEASTERN OGLE AND
NORTHWESTERN DE KALB COUNTIES THROUGH 200 PM CDT...
At 131 PM CDT, Doppler radar was tracking a strong thunderstorm near
Oregon, moving east at 35 mph.
HAZARD...Wind gusts up to 40 mph and penny size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to vegetation is
possible.
Locations impacted include...
Hillcrest, Creston, Kings, Rochelle, Chana, and Malta.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4200 8927 4207 8883 4189 8883 4189 8927
TIME...MOT...LOC 1831Z 266DEG 23KT 4196 8923
MAX HAIL SIZE...0.75 IN
MAX WIND GUST...40 MPH
PetrSpecial Weather Statement
National Weather Service Chicago/Romeoville
159 PM CDT Sun Jun 8 2025
ILZ011-012-081930-
Kane IL-De Kalb IL-
159 PM CDT Sun Jun 8 2025
...A STRONG THUNDERSTORM WILL IMPACT CENTRAL DE KALB AND SOUTHWESTERN
KANE COUNTIES THROUGH 230 PM CDT...
At 159 PM CDT, Doppler radar was tracking a strong thunderstorm over
Malta, or near DeKalb, moving east at 35 mph.
HAZARD...Wind gusts up to 40 mph and penny size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to vegetation is
possible.
Locations impacted include...
DeKalb, Cortland, Maple Park, Malta, Sycamore, and Virgil.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4179 8853 4187 8894 4198 8894 4198 8853
TIME...MOT...LOC 1859Z 275DEG 29KT 4193 8886
MAX HAIL SIZE...0.75 IN
MAX WIND GUST...40 MPH
PetrThe Chicago radar (KLOT), 64 km away, was scanning. The volume nearest the first event began at 19:14 UTC.
15 hail, 8 thunderstorm wind. Local standard time, as filed.
Five utility poles were blown down near Peace Rd and IL-38 in DeKalb.
Power poles were downed onto Webster Rd just north of I-88.
Trees and large tree limbs were downed along Main St west of Bunker Rd southeast of Elburn.
Large tree branches were also downed in the area.
Large trees were snapped at Harrison St and Carlisle Rd in Batavia.
Multiple trees were reported down in Batavia.
A power pole was snapped along Wilson St near River St in Batavia.
Large tree branches were downed at multiple residences near Lacey Rd and Ogden Ave in Downers Grove.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Illinois in 2025Every state in 2025This day in weather historyWarnings in Illinois, June 2025
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: 1269128, 1269131, 1269139, 1269136, 1269143, 1269144, 1269149, 1269150, 1269151, 1269153, 1269156, 1269160, 1269163, 1269166, 1269500, 1269503, 1269509, 1269517, 1269518, 1269520, 1269521, 1269522, 1269524.