Right now
The most recent data we hold from NOAA arrived 25 minutes ago, and this point is in it.
5 other detections within 20 km in the last 24 hours, the nearest <1 km from here.
This alert is in force until 24 September 2026, 15:15 UTC.
It is the 10th strongest of the 37 detections recorded within 20 km of this point since 13 March 2026. Another comparable one was recorded here earlier the same day. 9 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flood Warning issued September 23 at 10:10PM CDT until September 25 at 5:00PM CDT by NWS Milwaukee/Sullivan WI
Urban PEI: 1,750,250 within a heuristic 50 km radius; not unique people.
Nearby, since 13 March 2026
- September 23, 2026 · score 46 · 0.0 km
- September 22, 2026 · score 46 · 0.0 km
- August 9, 2026 · score 52 · 11.1 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 | 42.4462, -88.0276 |
| Nearest City | Round Lake Beach (10 km) |
| Urban exposure index (PEI) | 1.8M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-24T03:10:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.f4c64e3dcf0d4504595b9dcd0ecfeae5f2819a23.001.1 |
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: 2026-09-24T03:10:00.000Z.
First archived: 2026-09-24T03:13:27.069Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
2026-09-24T06:43:02.356Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
2026-09-24T06:37:40.625Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
2026-09-24T06:10:54.618Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
2026-09-24T06:05:33.000Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
2026-09-24T06:00:10.050Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
2026-09-24T03:19:01.059Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
Score Breakdown
Technical Details
| Event | Flood Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Lake, IL; Kenosha, WI; Lake, IL |
| Headline | Flood Warning issued September 23 at 10:10PM CDT until September 25 at 5:00PM CDT by NWS Milwaukee/Sullivan WI |
| Expires | 2026-09-24T10:15:00-05:00 |
| SenderName | NWS Milwaukee/Sullivan WI |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.f4c64e3dcf0d4504595b9dcd0ecfeae5f2819a23.001.1","noaa_urn:oid:2.49.0.1.840.0.8466fbc308a3da03603065de3a425b18e2dd60d8.001.1","noaa_urn:oid:2.49.0.1.840.0.8466fbc308a3da03603065de3a425b18e2dd60d8.002.1"] |
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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