Right now
The most recent data we hold from NOAA arrived 1 minute 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 23 May 2026 at 13:15 UTC. It is kept here as a record.
It is the 7th strongest of the 59 detections recorded within 20 km of this point since 15 March 2026. The last comparable one was on 4 May 2026. 11 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flood Warning issued May 21 at 8:08PM CDT until May 25 at 5:00PM CDT by NWS St Louis MO
Urban PEI: 152,761 within a heuristic 50 km radius; not unique people.
Nearby, since 15 March 2026
- March 16, 2026 · score 43 · 9.3 km
- June 25, 2026 · score 43 · 20.3 km
- June 8, 2026 · score 43 · 21.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
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 | 0.80/1 |
| Coordinates | 38.9819, -89.6818 |
| Nearest City | Edwardsville (30 km) |
| Urban exposure index (PEI) | 152.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-23T08:00:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flood Warning_noaa_urn:oid:2.49.0.1.840.0.e9938dddc265d489a6b891d378e9cb16 |
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: 2026-05-23T08:00:00.000Z.
First archived: 2026-05-22T01:32:25.878Z. 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 | Flood Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Callaway, MO; Osage, MO; Gasconade, MO; Montgomery, MO; Clinton, IL and 24 more areas |
| Headline | Flood Warning issued May 21 at 8:08PM CDT until May 25 at 5:00PM CDT by NWS St Louis MO |
| Expires | 2026-05-23T08:15:00-05:00 |
| SenderName | NWS St Louis MO |
| HasExactCoords | true |
| MergedCount | 33 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.e9938dddc265d489a6b891d378e9cb16b3a55c3b.002.1","noaa_urn:oid:2.49.0.1.840.0.e9938dddc265d489a6b891d378e9cb16b3a55c3b.001.1","noaa_urn:oid:2.49.0.1.840.0.06f5495217e83a7dc14821bf951fcb48a1bb9982.001.1","noaa_urn:oid:2.49.0.1.840.0.146b1a0182ccd8262895a2902bd5ce5430b71ca5.001.1","noaa_urn:oid:2.49.0.1.840.0.146b1a0182ccd8262895a2902bd5ce5430b71ca5.002.1","noaa_urn:oid:2.49.0.1.840.0.146b1a0182ccd8262895a2902bd5ce5430b71ca5.003.1","noaa_urn:oid:2.49.0.1.840.0.8165e7d3a61760dbf41760ba16b2a83387264034.002.1","noaa_urn:oid:2.49.0.1.840.0.8165e7d3a61760dbf41760ba16b2a83387264034.004.1","noaa_urn:oid:2.49.0.1.840.0.8165e7d3a61760dbf41760ba16b2a83387264034.003.1","noaa_urn:oid:2.49.0.1.840.0.f65c125c54eb93213f6a19633d46cda83b785bfe.001.1","noaa_urn:oid:2.49.0.1.840.0.f132f31ab2b2cfad8def18c916f806ca5ec3f629.005.1","noaa_urn:oid:2.49.0.1.840.0.f132f31ab2b2cfad8def18c916f806ca5ec3f629.007.1","noaa_urn:oid:2.49.0.1.840.0.f132f31ab2b2cfad8def18c916f806ca5ec3f629.006.1","noaa_urn:oid:2.49.0.1.840.0.f132f31ab2b2cfad8def18c916f806ca5ec3f629.001.1","noaa_urn:oid:2.49.0.1.840.0.f132f31ab2b2cfad8def18c916f806ca5ec3f629.002.1","noaa_urn:oid:2.49.0.1.840.0.f132f31ab2b2cfad8def18c916f806ca5ec3f629.004.1","noaa_urn:oid:2.49.0.1.840.0.93175d3a908b5fbf7d6930e670c4b2fb64fe2d2b.003.1","noaa_urn:oid:2.49.0.1.840.0.93175d3a908b5fbf7d6930e670c4b2fb64fe2d2b.001.1","noaa_urn:oid:2.49.0.1.840.0.93175d3a908b5fbf7d6930e670c4b2fb64fe2d2b.006.1","noaa_urn:oid:2.49.0.1.840.0.93175d3a908b5fbf7d6930e670c4b2fb64fe2d2b.005.1","noaa_urn:oid:2.49.0.1.840.0.93175d3a908b5fbf7d6930e670c4b2fb64fe2d2b.007.1","noaa_urn:oid:2.49.0.1.840.0.93175d3a908b5fbf7d6930e670c4b2fb64fe2d2b.002.1","noaa_urn:oid:2.49.0.1.840.0.93175d3a908b5fbf7d6930e670c4b2fb64fe2d2b.004.1","noaa_urn:oid:2.49.0.1.840.0.d53e8b52ed334020ff57a18b2708dea474430568.001.1","noaa_urn:oid:2.49.0.1.840.0.2bc903fae634564582d289729f7b0ec1401b6746.001.1","noaa_urn:oid:2.49.0.1.840.0.1020fe0a513ca70558cb6c24c9ce97924474da54.003.1","noaa_urn:oid:2.49.0.1.840.0.1020fe0a513ca70558cb6c24c9ce97924474da54.001.1","noaa_urn:oid:2.49.0.1.840.0.1020fe0a513ca70558cb6c24c9ce97924474da54.002.1","noaa_urn:oid:2.49.0.1.840.0.45a0f1baebae72458635bbce7cedd208c6451a13.002.1","noaa_urn:oid:2.49.0.1.840.0.45a0f1baebae72458635bbce7cedd208c6451a13.001.1","noaa_urn:oid:2.49.0.1.840.0.a19421c34505202c9777813d1b311eb399448dff.002.1","noaa_urn:oid:2.49.0.1.840.0.a19421c34505202c9777813d1b311eb399448dff.001.1","noaa_urn:oid:2.49.0.1.840.0.f132f31ab2b2cfad8def18c916f806ca5ec3f629.003.1"] |
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.
Review the area, threshold and delivery channel in your account.
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