Verified storm · closed
70 mph wind verified in Grundy County, IL — August 11, 2026
Verified against measured NWS storm reports — ground-truth wind measurements, not radar hail estimates, and never forecasts.
Storm stats
| County | Grundy County, IL |
|---|---|
| Max wind (NWS reports) | 70 mph |
| Swath area | 112 mi² (290 km²) |
| First radar detection | 2026-08-11 15:19 UTC |
| Last radar detection | 2026-08-11 16:17 UTC |
| Verified | 2026-08-11 16:10 UTC |
| Swath centroid | 41.2830, -88.3776 |
| Storm ID | sw_2ffe7b2f |
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Grundy County, IL — verified storm record
Swath has 5 radar-verified hail storms on record for Grundy County, IL going back to September 2025, the largest measuring 2.33″. Every one was measured against NOAA MRMS radar — not estimated, and not a forecast.