Right now
The most recent data we hold from NOAA arrived 22 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 01:00 UTC. It is kept here as a record.
No stronger detection stands among the 39 recorded within 20 km of this point since 3 April 2026 — 8 others scored the same. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 24 at 6:59PM CDT until June 24 at 8:00PM CDT by NWS Chicago IL
Urban PEI: 1,065,556 within a heuristic 50 km radius; not unique people.
Nearby, since 3 April 2026
- June 25, 2026 · score 52 · 5.7 km
- June 25, 2026 · score 52 · 6.6 km
- July 3, 2026 · score 48 · 14.0 km
How we know
10 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 52 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) | 52 / 100 |
| Legacy data-support index | 0.89/1 |
| Coordinates | 42.1317, -88.6647 |
| Nearest City | Sycamore (16 km) |
| Urban exposure index (PEI) | 1.1M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-24T23:59:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.4c948c87833ad124631afbc5b28291c5 |
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: 2026-06-24T23:59:00.000Z.
First archived: 2026-06-25T00:03:05.529Z. 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; Will, IL; La Salle, IL; Lee, IL; La Salle, IL and 3 more areas |
| Headline | Severe Thunderstorm Warning issued June 24 at 6:59PM CDT until June 24 at 8:00PM CDT by NWS Chicago IL |
| Expires | 2026-06-24T20:00:00-05:00 |
| SenderName | NWS Chicago IL |
| HasExactCoords | true |
| MergedCount | 7 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.4c948c87833ad124631afbc5b28291c5f10910e3.001.1","noaa_urn:oid:2.49.0.1.840.0.253de66b9a5f44c0cd69240f6710992a43d988a0.001.1","noaa_urn:oid:2.49.0.1.840.0.39d53f43053e89be523354114179aa067664b194.001.1","noaa_urn:oid:2.49.0.1.840.0.78f1d6397f30f2ceafc82206d7f27e6d1b9d819f.002.1","noaa_urn:oid:2.49.0.1.840.0.e3a43a0a4f0b7e8a5bd709c70f3fde557116703f.001.1","noaa_urn:oid:2.49.0.1.840.0.4aa11bb2965155b997b6b6a64b0c53b4a8ee7128.001.1","noaa_urn:oid:2.49.0.1.840.0.4021f2ea82f77d6903d90ba24323798a5c44843a.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_42.160_-88.300_1782341640000","source":"iem","severity":"low","severityValue":25,"timestamp":1782341640000,"latitude":42.16,"longitude":-88.3},{"id":"iem_H_42.150_-89.230_1782340920000","source":"iem","severity":"low","severityValue":25,"timestamp":1782340920000,"latitude":42.15,"longitude":-89.23},{"id":"iem_D_42.000_-88.190_1782344160000","source":"iem","severity":"low","severityValue":25,"timestamp":1782344160000,"latitude":42,"longitude":-88.19},{"id":"iem_D_42.000_-88.150_1782344280000","source":"iem","severity":"low","severityValue":25,"timestamp":1782344280000,"latitude":42,"longitude":-88.15},{"id":"iem_G_42.110_-88.280_1782342840000","source":"iem","severity":"low","severityValue":25,"timestamp":1782342840000,"latitude":42.11,"longitude":-88.28},{"id":"iem_H_42.160_-88.340_1782341820000","source":"iem","severity":"low","severityValue":25,"timestamp":1782341820000,"latitude":42.16,"longitude":-88.34},{"id":"iem_H_42.150_-88.270_1782341940000","source":"iem","severity":"low","severityValue":25,"timestamp":1782341940000,"latitude":42.15,"longitude":-88.27},{"id":"iem_E_42.040_-88.290_1782344880000","source":"iem","severity":"low","severityValue":25,"timestamp":1782344880000,"latitude":42.04,"longitude":-88.29},{"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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