Hail size 1"
Grant Park Kankakee County
“(LOT)”
— NOAA / SPC storm report
/ Storm field report · Kankakee
Hail in Grant Park · Mar 10, 2026
The estimated-size surface reached 2" aloft; NEXRAD logged no point detections over Grant Park that day. At 2" — tennis ball — this is a severe hail signal associated with roof damage. Open it on the live map to see the swath over the streets.
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Peak hail signal 2" ≈ tennis ball · radar-estimated size aloft
Homes in the hail footprint 3,598
Ground reports 2 2 hail
Radar surfaces 1 Estimated size only
Convective day · Mar 10, 2026 · noon–noon UTC
Severity
The most severe storm Grant Park has seen in the last 12 months
Composite score · 5.3 / 10
Storm severity score
Overview's storm severity score weighs hailstone size, homes in the footprint, and ground-truth reports.
5.3 /10
- Peak hail signal
- 50 /100
- Homes exposed
- 71 /100
- Ground truth
- 33 /100
Largest radar-indicated size — a signal of damage potential, not confirmation.
How many homes sit inside the storm's footprint.
Independent storm reports filed with the NWS.
Evidence / storm surfaces
How Grant Park saw the hail — from two instruments
Mar 10, 2026 · Grant Park, IL
We map this storm two ways: the NEXRAD radar signatures the storm produced overhead, and the radar-estimated size of the hail in the air. The two surfaces don’t have to match — where they diverge is where estimated size aloft ran ahead of, or behind, what the signatures caught.
Radar-estimated hail size Surface resolved
Estimated size field Maximum hail size as estimated from radar aloft. Treat it as the storm's ceiling — the largest supportable stone — rather than a ground measurement.
Max size
2"
Only the radar-estimated size surface resolved for Mar 10, 2026 — this storm produced no NEXRAD point detections over Grant Park, so there is one map to show, not two.
The storm in context
Where Mar 10, 2026 sits in Grant Park's hail record.
This was Grant Park's 1st recorded hail day — the first hail day in our records for the city. By severity it ranks 1st of the 10 storms we have logged here. Radar put the day's largest stone over Grant Park at 2" — radar-estimated size aloft.
The Mar 10, 2026 convective day was bigger than Grant Park: the same system put hail over 470 other tracked cities, 100 of them in Illinois. Nearest: Momence (5 miles east, up to 2"); Manteno (5 miles west, up to 2"); Pembroke Township (9 miles southeast, up to 2").
These maps are stills. In the app this date is one of 10 Grant Park storm dates on a live map — both surfaces, the reports, and a replay — and the same map is where you draw the swath. This page rebuilds nightly.
Ground reports
What people on the ground reported
2 reports filed with the NWS
These are storm reports filed with the National Weather Service and released through the NOAA Storm Prediction Center — public-domain observations from spotters, the public, and NWS surveys. We quote each one exactly as filed.
Hail reports
2 reports Hail size 1.75"
Momence Kankakee County
“Multiple reports of hail in Momence. The largest hailstones were estimated to be the size of golf balls. (LOT)”
— NOAA / SPC storm report
Storm forensics
How the storm moved
Timing and place names from NOAA ground reports
Read from the arrival times and locations of the NOAA ground reports, not a radar-measured storm track.
Hail was reported over 221 minutes, from to .
Reports came from Momence — beyond Grant Park itself.
Severe hail signal
What 2" hail means for Grant Park roofs.
Two-inch-plus hail is capable of puncturing shingles, breaking skylights or windows, and heavily denting soft materials. The strongest radar bands warrant prompt inspection, but neither the signal nor the footprint confirms damage at a specific address.
Radar reading · not confirmed damage
Roofing exposure
What this storm is worth to a roofer.
3,598 homes × $12,000 avg. claim
Potential roof exposure
$43M
Potential roof exposure — 3,598 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
- Illustrative jobs
- 18 jobs
- Illustrative work
- ~$270K
Close just 0.5% of the 3,598 homes in this footprint at the average $15,000 roof job. Illustrative math, not a projection — your results depend on your outreach and how the market responds.
Claim window
March 2028
Claims from this storm can typically be filed until around March 2028 — the window to reach these homeowners while it's still open. Deadlines vary by policy and state.
Names and phones for every home in the footprint: at most $756 on top of the $150 plan.
Grant Park hail history
Other storms in Grant Park.
10 recorded storm days in Grant Park, IL
Map unavailable
NEXRAD surface Storm date Grant Park / IL
Aug 11, 2026
1" Estimated 1"
No ground reports filed Open report →
Estimated-size surface Storm date Grant Park / IL
Jul 27, 2026
0.75" Estimated 0.75"
No ground reports filed Open report →
NEXRAD surface Storm date Grant Park / IL
Jul 20, 2026
No ground reports filed Open report →
Estimated-size surface Storm date Grant Park / IL
Jul 18, 2026
0.5" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Grant Park / IL
Jun 11, 2026
1" Estimated 1"
No ground reports filed Open report →
NEXRAD surface Storm date Grant Park / IL
May 4, 2026
No ground reports filed Open report →
Estimated-size surface Storm date Grant Park / IL
Apr 13, 2026
1.25" Signatures 1.25" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Grant Park / IL
Mar 31, 2026
0.5" Signatures 0.5"
No ground reports filed Open report →
NEXRAD surface Storm date Grant Park / IL
Mar 26, 2026
No ground reports filed Open report →
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Set your territory and alerts today. When hail hits, use Overview to choose your streets and get moving.
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A storm day here is a convective day — it runs from noon to noon
UTC, so late-night hail is grouped with the afternoon storm that
spawned it rather than split across two calendar dates. Ground
reports are public-domain observations from the NOAA Storm
Prediction Center. Radar tells you where to look. Only an inspection confirms damage at an address. Last updated Aug 12, 2026.