Right now
The most recent data we hold from NOAA arrived 59 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
One other detection within 20 km in the last 24 hours, <1 km from here.
This alert is in force until 26 September 2026, 19:45 UTC.
No stronger detection stands among the 22 recorded within 20 km of this point since 13 March 2026 — 21 others scored the same. The last comparable one was on 25 September 2026. 20 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flood Warning issued September 25 at 8:41PM CDT until September 28 at 7:00AM CDT by NWS Chicago IL
Urban PEI: 2,257,029 within a heuristic 50 km radius; not unique people.
Nearby, since 13 March 2026
- September 26, 2026 · score 46 · 0.0 km
- September 25, 2026 · score 46 · 0.0 km
- August 9, 2026 · 6.6 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 46 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 v5. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 46 / 100 |
| Legacy data-support index | 0.80/1 |
| Coordinates | 42.3921, -87.9336 |
| Nearest City | Gurnee (4 km) |
| Urban exposure index (PEI) | 2.3M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-26T01:41:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.951759a5df5a3425be1df9eaeca8ef446b499430.001.1 |
Physical priority index · v5. 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: 2026-09-26T01:41:00.000Z.
First archived: 2026-09-26T01:44:41.292Z. Material modification: 2026-09-26T13:34:47.552Z.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
2026-09-26T13:40:09.389Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
2026-09-26T13:34:47.552Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
2026-09-26T13:07:58.488Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
2026-09-26T11:04:24.864Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
2026-09-26T10:21:36.598Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
2026-09-26T10:16:17.537Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
2026-09-26T09:06:24.492Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
2026-09-26T08:34:14.730Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
2026-09-26T08:18:13.482Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
2026-09-26T05:32:36.668Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
2026-09-26T05:06:06.804Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
2026-09-26T02:53:16.373Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
2026-09-26T02:16:28.458Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
Score Breakdown
Technical Details
| Event | Flood Warning |
| MessageId | urn:oid:2.49.0.1.840.0.951759a5df5a3425be1df9eaeca8ef446b499430.001.1 |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Lake, IL |
| Headline | Flood Warning issued September 25 at 8:41PM CDT until September 28 at 7:00AM CDT by NWS Chicago IL |
| Expires | 2026-09-26T14:45:00-05:00 |
| SenderName | NWS Chicago IL |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.e74fe38c273b0bba1814a01038b588aa79958106.002.1","noaa_urn:oid:2.49.0.1.840.0.e74fe38c273b0bba1814a01038b588aa79958106.001.1"] |
Safety Information
During flooding: never walk, swim, or drive through floodwaters. Six inches of moving water can knock you down, and one foot of water can sweep away a vehicle. Move to higher ground if waters rise. After flooding, avoid contact with floodwater which may contain sewage, chemicals, or debris. Follow local emergency service guidance.
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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