This alert expired on 21 July 2026 at 01:00 UTC. It is kept here as a record.
It is the 6th strongest of the 30 detections recorded within 20 km of this point since 17 April 2026. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 20 at 7:47PM CDT until July 20 at 8:00PM CDT by NWS Des Moines IA
An estimated 462,966 people live within 50 km of this point.
Nearby, since 17 April 2026
- June 6, 2026 · score 67 · 16.4 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 37 out of 100, at 80 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
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) | 37 / 100 |
| Our confidence | 80% |
| Coordinates | 41.5222, -93.1939 |
| Nearest City | Newton (23 km) |
| Population Exposed | 463.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-21T00:47:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.3d50c1378ccb108daa1815801a07423c |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Jasper, IA; Marion, IA; Polk, IA; Warren, IA |
| Headline | Severe Thunderstorm Warning issued July 20 at 7:47PM CDT until July 20 at 8:00PM CDT by NWS Des Moines IA |
| Expires | 2026-07-20T20:00:00-05:00 |
| SenderName | NWS Des Moines IA |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.3d50c1378ccb108daa1815801a07423c89449a7c.001.1","noaa_urn:oid:2.49.0.1.840.0.819641513c7a723c4a26b851c54d2feff5cea4a9.001.1"] |
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.
Want to know when something happens near Newton?
Calamity.live data shows a weather event with CalamityScore 37/100, near Newton (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.