Right now
The most recent data we hold from NOAA arrived 31 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 1 June 2026 at 14:00 UTC. It is kept here as a record.
No stronger detection stands among the 61 recorded within 20 km of this point since 16 March 2026 — 28 others scored the same. Another comparable one was recorded here earlier the same day. 34 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued June 1 at 6:15AM CDT until June 1 at 9:00AM CDT by NWS St Louis MO
Urban PEI: 129,330 within a heuristic 50 km radius; not unique people.
Nearby, since 16 March 2026
- June 1, 2026 · score 43 · 0.2 km
- June 2, 2026 · score 43 · 2.4 km
- May 23, 2026 · score 22 · 21.9 km
How we know
3 recorded sources include NOAA; independence is not established by this count.
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 | 0.90/1 |
| Coordinates | 39.1156, -92.6121 |
| Nearest City | Columbia (31 km) |
| Urban exposure index (PEI) | 129.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-01T11:15:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.54b851eced2949567f444b00aeac8cd7 |
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: 2026-06-01T11:15:00.000Z.
First archived: 2026-06-01T12:36:30.118Z. 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 | Boone, MO; Wyandotte, KS; Clay, MO; Platte, MO; Calhoun, IL; Greene, IL; Jersey, IL; Lincoln, MO; Pike, MO and 2 more areas |
| Headline | Flash Flood Warning issued June 1 at 6:15AM CDT until June 1 at 9:00AM CDT by NWS St Louis MO |
| Expires | 2026-06-01T09:00:00-05:00 |
| SenderName | NWS St Louis MO |
| HasExactCoords | true |
| MergedCount | 5 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.54b851eced2949567f444b00aeac8cd786a1ce4e.001.1","noaa_urn:oid:2.49.0.1.840.0.4d7c3ad572cf54fc2327ded31e625697a11e3b30.001.1","noaa_urn:oid:2.49.0.1.840.0.f3d59391b72765f0557b20b8596c7a13ef242487.001.1","noaa_urn:oid:2.49.0.1.840.0.6c7406d468de8af2e76c8ad9d43a84c66c4624b8.001.1","noaa_urn:oid:2.49.0.1.840.0.ea96b58839b82ddfb6d437e37ab53d05d8ad70c5.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 58 |
| Iem Unit | MPH |
| Iem City | Fayette |
| Iem County | Howard |
| Iem State | MO |
| Iem Wfo | EAX |
| Iem Remark | Personal weather station measured 58 mph. |
| MergedSources | [{"id":"iem_F_38.990_-92.370_1780314300000","source":"iem","severity":"low","severityValue":25,"timestamp":1780314300000,"latitude":38.99,"longitude":-92.37},{"id":"iem_G_39.150_-92.690_1780299540000","source":"iem","severity":"low","severityValue":25,"timestamp":1780299540000,"latitude":39.15,"longitude":-92.69}] |
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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