Right now
The most recent data we hold from NOAA arrived 7 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 8 June 2026 at 22:00 UTC. It is kept here as a record.
It is the 2nd strongest of the 91 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued June 8 at 10:54AM CDT until June 8 at 5:00PM CDT by NWS St Louis MO
Urban PEI: 1,330,524 within a heuristic 50 km radius; not unique people.
Nearby, since 15 March 2026
- June 8, 2026 · score 52 · 1.4 km
- June 8, 2026 · score 52 · 6.7 km
- July 4, 2026 · score 52 · 8.9 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
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 | 0.81/1 |
| Coordinates | 38.8086, -90.4184 |
| Nearest City | Hazelwood (6 km) |
| Urban exposure index (PEI) | 1.3M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-08T15:54:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.09297efe92ee297657b1324ada5c30d0 |
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: 2026-06-08T15:54:00.000Z.
First archived: 2026-06-08T16:09:01.800Z. 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 | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Madison, IL; St. Charles, MO; St. Louis, MO; St. Louis City, MO; Calhoun, IL; Jersey, IL; Madison, IL; Franklin, MO; Jefferson, MO; St. Charles, MO; St. Louis, MO; Warren, MO and 2 more areas |
| Headline | Flash Flood Warning issued June 8 at 10:54AM CDT until June 8 at 5:00PM CDT by NWS St Louis MO |
| Expires | 2026-06-08T17:00:00-05:00 |
| SenderName | NWS St Louis MO |
| HasExactCoords | true |
| MergedCount | 5 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.09297efe92ee297657b1324ada5c30d0d8b8a0d8.001.1","noaa_urn:oid:2.49.0.1.840.0.b8b88691fd81f758ead785a50dfaf667d4c15d4c.001.1","noaa_urn:oid:2.49.0.1.840.0.d8e13fcfe6bc8c512dd1587e12123f7ed76dfecb.001.1","noaa_urn:oid:2.49.0.1.840.0.ed934dab8071b2a0c09c1c147309b87901dc032b.001.1","noaa_urn:oid:2.49.0.1.840.0.72cc6e36907d764a8b078de772284cd6e2004bc3.001.1"] |
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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