Hail in Grayslake · May 15, 2026
NEXRAD logged 0 hail signatures up to 1"; the estimated-size surface reached 0" aloft. Open it on the live map to see the swath over the streets.
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Convective day · May 15, 2026 · noon–noon UTC
Severity
The 3rd most severe storm Grayslake has seen in the last 12 months
Overview's storm severity score weighs hailstone size, homes in the footprint, and ground-truth reports.
- Peak hail signal
- 25 /100
- Homes exposed
- 0 /100
- Ground truth
- 0 /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 Grayslake saw the hail — from two instruments
Two instruments, one storm: NEXRAD logs the point signatures it detected overhead, while the estimated-size surface models how large the hail aloft could have grown. Agreement between them is not guaranteed — the gaps are where the model ran ahead of, or behind, the detections.
Radar signature field NEXRAD's hail signatures for this storm: the spots the radar detected from above. A detection overhead is not the same thing as a confirmed stone below.
Estimated size field Radar-estimated maximum hail size across the swath, modeled from radar aloft. It reflects the biggest stone the storm could support, which may differ from what actually fell.
The storm in context
Where May 15, 2026 sits in Grayslake's hail record.
This was Grayslake's 2nd recorded hail day, arriving 28 days after the Apr 17, 2026 storm. By severity it ranks 3rd of the 5 storms we have logged here. Radar put the day's largest stone over Grayslake at 1" — the largest NEXRAD radar signature.
The May 15, 2026 convective day was bigger than Grayslake: the same system put hail over 444 other tracked cities, 20 of them in Illinois. Nearest: Island Lake (5 miles west, up to 1"); Libertyville (8 miles east, up to 1.75"); Mchenry (10 miles west, up to 1").
These maps are stills. In the app this date is one of 5 Grayslake 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
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.
No ground reports were filed with the National Weather Service for this storm over Grayslake. That is common: a report depends on someone being there to see it and take the time to call it in. The radar surfaces above are the record here — the storm was detected from above even though no one on the ground logged it.
Damage-capable hail signal
What 1" hail means for Grayslake roofs.
Quarter-size and larger hail can bruise asphalt mats, remove granules, and dent exposed soft metal. The mapped footprint identifies an inspection priority area — it does not identify which individual roofs, if any, sustained damage.
Radar reading · not confirmed damage
Grayslake hail history
Other storms in Grayslake.
Estimated-size surface Aug 9, 2026
0.5"
Estimated-size surface Jun 5, 2026
1.75"
NEXRAD surface May 17, 2026
NEXRAD surface Apr 17, 2026
The next storm won’t wait for you.
Set your territory and alerts today. When hail hits, use Overview to choose your streets and get moving.
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