Right now
The most recent data we hold from NOAA arrived 18 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 25 June 2026 at 00:15 UTC. It is kept here as a record.
It is the 8th strongest of the 58 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 24 at 6:22PM CDT until June 24 at 7:15PM CDT by NWS Chicago IL
Urban PEI: 348,802 within a heuristic 50 km radius; not unique people.
Nearby, since 16 March 2026
- May 7, 2026 · score 37 · 1.6 km
- June 24, 2026 · score 43 · 13.5 km
- July 3, 2026 · score 67 · 15.4 km
How we know
4 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 43 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 43 / 100 |
| Legacy data-support index | 0.89/1 |
| Coordinates | 42.6409, -89.0437 |
| Nearest City | Janesville (5 km) |
| Urban exposure index (PEI) | 348.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-24T23:22:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.64e8c21e9235c15d2daaeba210d702c7 |
Physical priority index · v1. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-06-24T23:22:00.000Z.
First archived: 2026-06-24T23:25:24.511Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Cook, IL; DuPage, IL; Kane, IL; Columbia, WI; Dane, WI; Lee, IL and 11 more areas |
| Headline | Severe Thunderstorm Warning issued June 24 at 6:22PM CDT until June 24 at 7:15PM CDT by NWS Chicago IL |
| Expires | 2026-06-24T19:15:00-05:00 |
| SenderName | NWS Chicago IL |
| HasExactCoords | true |
| MergedCount | 14 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.64e8c21e9235c15d2daaeba210d702c7c5de623f.001.1","noaa_urn:oid:2.49.0.1.840.0.bfa648e56fdc56aab9905edbe18db5a6e16264f2.001.1","noaa_urn:oid:2.49.0.1.840.0.9dc4f8a9c335b7bc88b0bbcb82795a76f3812122.001.1","noaa_urn:oid:2.49.0.1.840.0.8591a0a5581a0fc24ba0c5ed4356c0edbee4396e.001.1","noaa_urn:oid:2.49.0.1.840.0.91ddeeadfe32a75bde6cf1a5642dc77cad713a69.001.1","noaa_urn:oid:2.49.0.1.840.0.1290ff2c788a6cbb954fe2e18ec6aef33962da33.001.1","noaa_urn:oid:2.49.0.1.840.0.0f5fd705636c27377f6aeeed898dcd16d23512ec.002.1","noaa_urn:oid:2.49.0.1.840.0.39a020df65347e2b1c735929028a84b4df9cf770.001.1","noaa_urn:oid:2.49.0.1.840.0.bc7644f1f840dc488917427af1ca76bfe39a0c3f.001.1","noaa_urn:oid:2.49.0.1.840.0.6891d27da0af97a404c7365eee2b1867665fddc1.001.1","noaa_urn:oid:2.49.0.1.840.0.4cf2891efd97fe33e83b84112436a2364863dcad.001.1","noaa_urn:oid:2.49.0.1.840.0.19fad73ed6df23e22d7acad01bdbf287b0fd163e.001.1","noaa_urn:oid:2.49.0.1.840.0.b2ca0b6e2213a8b3c58e68c0e6e088b5d751bd91.002.1","noaa_urn:oid:2.49.0.1.840.0.f829ef758a25bc92d533355a8a3bd1236c34c191.001.1"] |
| Iem TypeSummary | H |
| Iem Magnitude | 1.5 |
| Iem Unit | Inch |
| Iem City | 2 E Huntley |
| Iem County | McHenry |
| Iem State | IL |
| Iem Wfo | LOT |
| Iem Remark | Public report of 1.5 inch hail near Huntly. Relayed via mping. |
| MergedSources | [{"id":"iem_H_42.760_-88.910_1782333960000","source":"iem","severity":"low","severityValue":25,"timestamp":1782333960000,"latitude":42.76,"longitude":-88.91},{"id":"iem_H_42.150_-89.230_1782340920000","source":"iem","severity":"low","severityValue":25,"timestamp":1782340920000,"latitude":42.15,"longitude":-89.23},{"id":"iem_H_42.180_-88.390_1782340860000","source":"iem","severity":"low","severityValue":25,"timestamp":1782340860000,"latitude":42.18,"longitude":-88.39}] |
Safety Information
Always follow official guidance from your local emergency management agency. This platform provides scientific monitoring data and is not a substitute for official warnings. If you are in immediate danger, contact your local emergency number.
Series begins 8 March 2026. Comparisons refer to that period only. Collection gap: 14-26 August 2026.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
Review the area, threshold and delivery channel in your account.
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