Right now
The most recent data we hold from NOAA arrived 2 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 12 September 2026 at 22:15 UTC. It is kept here as a record.
It is the 2nd strongest of the 48 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 12 at 4:48PM CDT until September 12 at 5:15PM CDT by NWS Topeka KS
Urban PEI: 24,621 within a heuristic 50 km radius; not unique people.
Nearby, since 15 March 2026
- May 15, 2026 · score 39 · 11.6 km
- June 13, 2026 · score 34 · 13.2 km
- June 5, 2026 · score 22 · 18.3 km
How we know
3 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 40 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 v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | High |
| Calamity Score (ours) | 40 / 100 |
| Legacy data-support index | 0.90/1 |
| Coordinates | 39.2950, -97.1617 |
| Nearest City | Junction City (41 km) |
| Urban exposure index (PEI) | 24.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-12T21:48:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.020b82b5c0764ad783f443fff8d27f5a0820af3c.002.1 |
Physical priority index · v4 (historical). 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: 2026-09-12T21:48:00.000Z.
First archived: 2026-09-12T21:54:14.958Z. 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 | Clay, KS |
| Headline | Severe Thunderstorm Warning issued September 12 at 4:48PM CDT until September 12 at 5:15PM CDT by NWS Topeka KS |
| Expires | 2026-09-12T17:15:00-05:00 |
| SenderName | NWS Topeka KS |
| HasExactCoords | true |
| Spc ReportType | hail |
| Spc Speed | 100 |
| Spc Location | 2 WNW Jamestown |
| Spc County | Cloud |
| Spc State | KS |
| Spc Comments | Pictures sent from EM. (TOP) |
| Iem TypeSummary | G |
| Iem Magnitude | 55 |
| Iem Unit | MPH |
| Iem City | Junction City |
| Iem County | Geary |
| Iem State | KS |
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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