A powerful line of severe storms swept across Illinois, bringing hail reports that could rewrite the state’s record books.
The National Weather Service is evaluating a claim of a 6-inch hailstone observed in Kankakee during Tuesday’s storms, a size that could surpass the existing Illinois record of 4.75 inches set in Minooka in 2015.
While damage to homes, vehicles, and property has been widely reported across the Chicago area and northwest Indiana, the record remains unconfirmed pending official verification.
Potential Illinois hailstone record under investigation
The reported hail in Tuesday’s storms ranged from small ice pellets to much larger stones. Eyewitness accounts described sizes that far exceed common hail.
The central question is whether a 6-inch hailstone observed in Kankakee truly occurred. Measurements are needed to confirm if a new state record has been set.
The National Weather Service is carefully reviewing all evidence before issuing an official determination.
What is being verified
Several steps are underway to verify any potential record. The NWS relies on multiple data sources and standardized procedures to ensure accuracy before declaring a new state record.
- Ground measurements taken by trained weather spotters and at official weather stations
- Radar data and storm structure analysis to estimate hail size and distribution
- Photographic, video, and eyewitness documentation from the public and responders
- Cross-checks with damage patterns to assess whether reported sizes are consistent with observed impacts
- Verification of exact location and timing to align with storm reports
Officials emphasize that even with compelling images or reports, confirmation requires precise measurement and corroborating evidence.
In weather verification, context matters—wind, storm motion, and deposition can influence how hail appears in photos, so measurements must be carefully analyzed.
Storm damage across the Chicago area and northwest Indiana
Tuesday’s storms produced widespread damage. Homes, businesses, and vehicles sustained impact from hail as the weather system moved through heavily populated parts of Illinois and neighboring Indiana.
Residents described shattered windows, dented panels, and roof damage in several neighborhoods. There were also downed trees and localized power interruptions in some communities.
Observed impacts
- Shattered windows and dented siding on homes and garages
- Significant damage to vehicles, including windshields and body panels
- Debris and roof damage that required emergency response and assessments
- Public reports and social media posts showing hail stones varying in size, from quarter-sized to notably larger forms
The public’s role in documenting storms can accelerate the evidence-gathering process. Official confirmation rests on standardized measurement and verification by meteorologists.
Record verification process and historical context
Illinois has a documented history of large hail, with Minooka recording a 4.75-inch stone in June 2015—the current public record.
The potential for a 6-inch hailstone in Kankakee would be an extraordinary addition to the record books, should verification confirm it.
The NWS stresses that records are only established after rigorous validation that satisfies national criteria for measurement, location, and timing.
How hail records are confirmed
- Meticulous ground measurement by qualified observers at the storm site
- Cross-reference with radar-based estimates to corroborate size estimates
- Standardized documentation that includes precise location and time
- Independent review by weather service specialists before any public record announcement
Until the NWS completes its review, the official status remains pending.
Tuesday’s storms delivered hail reports that challenged, and may surpass, Illinois’ historic records.
As the weather service compiles measurements and corroborates eyewitness evidence, observers should stay informed through official NWS updates and local meteorological bulletins.
The event serves as a stark reminder of how severe convective storms can produce extreme hail and widespread property damage.
Here is the source article for this story: Massive hailstone from Tuesday’s storms could be the largest in Illinois history