Right now
The most recent data we hold from NOAA arrived 4 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
5 other detections within 20 km in the last 24 hours, the nearest <1 km from here.
This alert expired on 20 September 2026 at 23:47 UTC. It is kept here as a record.
It is the 19th strongest of the 41 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 20 at 6:37PM CDT until September 20 at 6:45PM CDT by NWS Springfield MO
Urban PEI: 170,188 within a heuristic 50 km radius; not unique people.
Nearby, since 15 March 2026
- June 8, 2026 · score 67 · 6.8 km
- June 8, 2026 · score 46 · 11.2 km
- June 13, 2026 · score 43 · 14.8 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 37 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) | 37 / 100 |
| Legacy data-support index | 0.85/1 |
| Coordinates | 37.3500, -92.7857 |
| Nearest City | Springfield (48 km) |
| Urban exposure index (PEI) | 170.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-20T23:37:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.8252a0c2e2e31b0753de0571c8289c92b4bb269a.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: 2026-09-20T23:37:00.000Z.
First archived: 2026-09-20T23:42:56.579Z. 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 | Webster, MO |
| Headline | Severe Thunderstorm Warning issued September 20 at 6:37PM CDT until September 20 at 6:45PM CDT by NWS Springfield MO |
| Expires | 2026-09-20T18:47:00-05:00 |
| SenderName | NWS Springfield MO |
| HasExactCoords | true |
| Spc ReportType | wind |
| Spc Speed | UNK |
| Spc Location | Springfield |
| Spc County | Greene |
| Spc State | MO |
| Spc Comments | A tree fell on a powerline near Grand st and holland. (SGF) |
| MergedSources | [{"id":"spc_wind_37.01_-93.46_3","source":"spc","severity":"medium","severityValue":45,"timestamp":1789941600000,"latitude":37.01,"longitude":-93.46},{"id":"spc_wind_37.20_-93.29_7","source":"spc","severity":"medium","severityValue":45,"timestamp":1789943160000,"latitude":37.2,"longitude":-93.29}] |
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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