Hail size 1"
1 S Ingalls Park Will County
“Report from mPING. (LOT)”
— NOAA / SPC storm report
/ Storm field report · Will
Hail in Joliet · Mar 31, 2026
NEXRAD logged 17 hail signatures up to 2.5"; the estimated-size surface reached 1.25" aloft. At 2.5" — baseball — 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 2.5" ≈ baseball · the largest NEXRAD radar signature
Homes in the hail footprint 13,357
Ground reports 5 5 hail
Radar surfaces 2 NEXRAD + estimated size
Convective day · Mar 31, 2026 · noon–noon UTC
Severity
The most severe storm Joliet has seen in the last 12 months
Composite score · 7.1 / 10
Storm severity score
Overview's storm severity score weighs hailstone size, homes in the footprint, and ground-truth reports.
7.1 /10
- Peak hail signal
- 63 /100
- Homes exposed
- 83 /100
- Ground truth
- 83 /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 Joliet saw the hail — from two instruments
Mar 31, 2026 · Joliet, 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.
NEXRAD radar signatures Surface resolved
Radar signature field NEXRAD radar signatures — the point detections the storm produced overhead. A signature is where the radar saw hail, not a confirmed stone on the ground.
Max size
2.5"
Detections
17
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
1.25"
The storm in context
Where Mar 31, 2026 sits in Joliet's hail record.
This was Joliet's 1st recorded hail day — the first hail day in our records for the city. By severity it ranks 1st of the 4 storms we have logged here. Radar put the day's largest stone over Joliet at 2.5" — the largest NEXRAD radar signature.
The Mar 31, 2026 convective day was bigger than Joliet: the same system put hail over 522 other tracked cities, 114 of them in Illinois. Nearest: New Lenox (5 miles east, up to 2"); Shorewood (5 miles west, up to 2.5"); Manhattan (9 miles southeast, up to 1.25").
These maps are stills. In the app this date is one of 4 Joliet 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
5 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
5 reports Hail size 1.75"
Rockdale Will County
“Photo shared on social media showing several large hailstones at Moen Avenue and Midland Avenue in Rockdale. The largest hailstones were approximately golf ball size. T (LOT)”
— NOAA / SPC storm report
Hail size 1"
2 E Shorewood Will County
“Report from mPING. (LOT)”
— NOAA / SPC storm report
Hail size 1.5"
1 S Preston Heights Will County
“Photo shared of approximately ping pong ball size hail at Route 53 and Laraway Road. Time estimated from radar. (LOT)”
— NOAA / SPC storm report
Hail size 1"
Preston Heights Will County
“Photo shared of hail in Preston Heights. The largest hailstones were approximately quarter size. Time estimated from radar. (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 13 minutes, from to .
Reports came from Ingalls Park, Rockdale, Shorewood, and Preston Heights — beyond Joliet itself.
Severe hail signal
What 2.5" hail means for Joliet 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.
13,357 homes × $12,000 avg. claim
Potential roof exposure
$160M
Potential roof exposure — 13,357 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
- Illustrative jobs
- 67 jobs
- Illustrative work
- ~$1M
Close just 0.5% of the 13,357 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 $2,805 on top of the $150 plan.
Joliet hail history
Other storms in Joliet.
4 recorded storm days in Joliet, IL
Estimated-size surface Storm date Joliet / IL
Jul 27, 2026
1.75" Estimated 1.75"
6 ground reports Open report →
Estimated-size surface Storm date Joliet / IL
Jul 3, 2026
1.5" Signatures 1.5" Estimated 0.75"
3 ground reports Open report →
Estimated-size surface Storm date Joliet / IL
Jul 2, 2026
1" Signatures 1" Estimated 0.5"
No ground reports filed Open report →
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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 3, 2026.