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.
4 other detections within 20 km in the last 24 hours, the nearest <1 km from here.
This alert expired on 9 September 2026 at 00:49 UTC. It is kept here as a record.
It is the 6th strongest of the 27 detections recorded within 20 km of this point since 17 April 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 8 at 7:40PM CDT until September 8 at 7:45PM CDT by NWS Des Moines IA
An estimated 47,576 people live within 50 km of this point.
Nearby, since 17 April 2026
- September 8, 2026 · score 37 · 20.7 km
- July 21, 2026 · score 37 · 21.9 km
- July 4, 2026 · score 43 · 22.1 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 28 out of 100, at 92 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
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 | Medium |
| Calamity Score (ours) | 28 / 100 |
| Our confidence | 92% |
| Coordinates | 41.4100, -92.9780 |
| Nearest City | Newton (33 km) |
| Population Exposed | 47.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-09T00:40:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.784cd9b2cff7e4d906aa2228fde4f18af9fc0219.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Jasper, IA; Lucas, IA; Mahaska, IA; Marion, IA; Monroe, IA; Poweshiek, IA |
| Headline | Severe Thunderstorm Warning issued September 8 at 7:40PM CDT until September 8 at 7:45PM CDT by NWS Des Moines IA |
| Expires | 2026-09-08T19:49:00-05:00 |
| SenderName | NWS Des Moines IA |
| HasExactCoords | true |
| Spc ReportType | wind |
| Spc Speed | 72 |
| Spc Location | 4 W Reasnor |
| Spc County | Jasper |
| Spc State | IA |
| Spc Comments | Time estimated from radar. (DMX) |
| Iem TypeSummary | G |
| Iem Magnitude | 72 |
| Iem Unit | MPH |
| Iem City | 4 W Reasnor |
| Iem County | Jasper |
| Iem State | IA |
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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