Right now
The most recent data we hold from NOAA arrived 6 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
9 other detections within 20 km in the last 24 hours, the nearest <1 km from here.
This alert is in force until 20 September 2026, 21:15 UTC.
It is the 13th strongest of the 38 detections recorded within 20 km of this point since 16 March 2026. The last comparable one was on 19 September 2026. 9 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flood Warning issued September 19 at 10:10PM CDT until September 22 at 9:00PM CDT by NWS Chicago IL
Urban PEI: 58,799 within a heuristic 50 km radius; not unique people.
Nearby, since 16 March 2026
- July 2, 2026 · score 63 · 12.4 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 32 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) | 32 / 100 |
| Legacy data-support index | 0.81/1 |
| Coordinates | 42.8578, -90.9648 |
| Nearest City | Dubuque (47 km) |
| Urban exposure index (PEI) | 58.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-20T17:42:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.591f25fbe25c9fcc3c1a9ffe9ee62f5fdcad40b6.001.1 |
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: 2026-09-20T17:42:00.000Z.
First archived: 2026-09-20T03:15:42.737Z. Material modification: 2026-09-20T04:36:04.353Z.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
2026-09-20T04:46:55.031Z · data_change
Index 32 → 32; severity medium → medium; version 5 → 5.
2026-09-20T04:36:04.353Z · data_change
Index 32 → 32; severity medium → medium; version 5 → 5.
2026-09-20T04:30:43.651Z · data_change
Index 32 → 32; severity medium → medium; version 5 → 5.
2026-09-20T04:04:02.124Z · data_change
Index 32 → 32; severity medium → medium; version 5 → 5.
2026-09-20T03:58:40.486Z · data_change
Index 32 → 32; severity medium → medium; version 5 → 5.
2026-09-20T03:53:19.612Z · data_change
Index 32 → 32; severity medium → medium; version 5 → 5.
2026-09-20T03:47:58.785Z · data_change
Index 32 → 32; severity medium → medium; version 5 → 5.
2026-09-20T03:42:23.305Z · data_change
Index 32 → 32; severity medium → medium; version 5 → 5.
2026-09-20T03:31:45.303Z · data_change
Index 32 → 32; severity medium → medium; version 5 → 5.
2026-09-20T03:26:28.508Z · data_change
Index 32 → 32; severity medium → medium; version 5 → 5.
2026-09-20T03:21:11.370Z · data_change
Index 32 → 32; severity medium → medium; version 5 → 5.
Score Breakdown
Technical Details
| Event | Flood Warning |
| Urgency | Expected |
| Certainty | Likely |
| AreaDesc | La Salle, IL; Lafayette, WI; Cook, IL; Lake, IN and 9 more areas |
| Headline | Flood Warning issued September 19 at 10:10PM CDT until September 22 at 9:00PM CDT by NWS Chicago IL |
| Expires | 2026-09-20T16:15:00-05:00 |
| SenderName | NWS Chicago IL |
| HasExactCoords | true |
| MergedCount | 16 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.591f25fbe25c9fcc3c1a9ffe9ee62f5fdcad40b6.001.1","noaa_urn:oid:2.49.0.1.840.0.2e2d4a306fa9c8eb3706b6d54c3338b30b0b0580.001.1","noaa_urn:oid:2.49.0.1.840.0.c9ee179fe7eea40ca0b5ebfbe70617485e1247ea.001.1","noaa_urn:oid:2.49.0.1.840.0.2498695b03e3ec4ac1cdc812459802a5136ac993.001.1","noaa_urn:oid:2.49.0.1.840.0.96477e38a6f86bd7cdb84e9fcedf0990011cac7f.001.1","noaa_urn:oid:2.49.0.1.840.0.c10ba31e9363469b68935b3938561fa711696fb9.001.1","noaa_urn:oid:2.49.0.1.840.0.b924c5052f0669b5a36071ceaab967c102c66631.001.1","noaa_urn:oid:2.49.0.1.840.0.fa72235b775e5ae87cbff7bd4fd74dbd41472ca2.001.1","noaa_urn:oid:2.49.0.1.840.0.64a42c7933bb72b1a9f5edc8bae991e7cd37474c.002.1","noaa_urn:oid:2.49.0.1.840.0.64a42c7933bb72b1a9f5edc8bae991e7cd37474c.001.1","noaa_urn:oid:2.49.0.1.840.0.ebd706fedf34c64022ee617be8ee3f6c65797cd2.001.1","noaa_urn:oid:2.49.0.1.840.0.27a7c7bb871fffb4c2e5ea69dfce62e1a5ae6b38.002.1","noaa_urn:oid:2.49.0.1.840.0.27a7c7bb871fffb4c2e5ea69dfce62e1a5ae6b38.001.1","noaa_urn:oid:2.49.0.1.840.0.c8079876531af6f9c9f92dbaeeb1e11285bd3f7a.002.1","noaa_urn:oid:2.49.0.1.840.0.c8079876531af6f9c9f92dbaeeb1e11285bd3f7a.001.1","noaa_urn:oid:2.49.0.1.840.0.c8079876531af6f9c9f92dbaeeb1e11285bd3f7a.003.1"] |
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.
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