Right now
The most recent data we hold from NOAA arrived 3 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 09:30 UTC. It is kept here as a record.
No stronger detection stands among the 79 recorded within 20 km of this point since 27 April 2026 — 50 others scored the same. Another comparable one was recorded here earlier the same day. 47 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 1 at 4:15AM CDT until June 1 at 4:30AM CDT by NWS St Louis MO
Urban PEI: 129,330 within a heuristic 50 km radius; not unique people.
Nearby, since 27 April 2026
- June 1, 2026 · score 43 · 12.5 km
- June 2, 2026 · score 43 · 13.1 km
How we know
2 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 | 0.85/1 |
| Coordinates | 39.1953, -92.5076 |
| Nearest City | Columbia (31 km) |
| Urban exposure index (PEI) | 129.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-01T09:15:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.a06a7674ce5ccdb7b972366c10a0629f |
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: 2026-06-01T09:15:00.000Z.
First archived: 2026-06-01T09:18:46.104Z. 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 | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Audrain, MO; Boone, MO; Callaway, MO; Chariton, MO; Cooper, MO; Howard, MO; Randolph, MO; Boone, MO; Callaway, MO; Cole, MO; Osage, MO and 3 more areas |
| Headline | Severe Thunderstorm Warning issued June 1 at 4:15AM CDT until June 1 at 4:30AM CDT by NWS St Louis MO |
| Expires | 2026-06-01T04:30:00-05:00 |
| SenderName | NWS St Louis MO |
| HasExactCoords | true |
| MergedCount | 6 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.a06a7674ce5ccdb7b972366c10a0629f4bec5a79.001.1","noaa_urn:oid:2.49.0.1.840.0.d5aa1ae743a70498ffea9e458de2b85e72bfca39.001.1","noaa_urn:oid:2.49.0.1.840.0.f6161e88dd844e91fa1d70df7b250c290d520a0c.002.1","noaa_urn:oid:2.49.0.1.840.0.32f64b5a6eb3be34b234e84dfd1e21c9acb9b8e3.001.1","noaa_urn:oid:2.49.0.1.840.0.08dc4f11be684363a54644c5b1039e8efa3e96d2.001.1","noaa_urn:oid:2.49.0.1.840.0.cb265c4555df7aecff1ba534c710843545545032.001.1"] |
| 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_G_39.150_-92.690_1780299540000","source":"iem","severity":"low","severityValue":25,"timestamp":1780299540000,"latitude":39.15,"longitude":-92.69}] |
Safety Information
Always follow official guidance from your local emergency management agency. This platform provides scientific monitoring data and is not a substitute for official warnings. If you are in immediate danger, contact your local emergency number.
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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