Right now
The most recent data we hold from NOAA arrived 6 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 7 August 2026 at 19:50 UTC. It is kept here as a record.
It is the 7th strongest of the 31 detections recorded within 20 km of this point since 15 March 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 August 7 at 2:40PM CDT until August 7 at 2:45PM CDT by NWS La Crosse WI
An estimated 27,366 people live within 50 km of this point.
Nearby, since 15 March 2026
- July 2, 2026 · score 34 · 14.4 km
- June 28, 2026 · score 34 · 16.5 km
- May 18, 2026 · score 63 · 19.2 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 34 out of 100, at 85 % 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) | 34 / 100 |
| Our confidence | 85% |
| Coordinates | 43.1550, -92.7112 |
| Nearest City | Mason City (40 km) |
| Population Exposed | 27.4K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-07T19:40:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.81d662af7bf0e716f7ddcec45dbfd628558617c4.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Chickasaw, IA; Floyd, IA; Howard, IA; Mitchell, IA |
| Headline | Severe Thunderstorm Warning issued August 7 at 2:40PM CDT until August 7 at 2:45PM CDT by NWS La Crosse WI |
| Expires | 2026-08-07T14:50:00-05:00 |
| SenderName | NWS La Crosse WI |
| HasExactCoords | true |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | Inch |
| Iem City | 2 WNW Thornton |
| Iem County | Cerro Gordo |
| Iem State | IA |
| Iem Wfo | DMX |
| Iem Remark | Report from mPING. Time estimated via radar. |
| MergedSources | [{"id":"iem_H_42.950_-93.430_1786128540000","source":"iem","severity":"low","severityValue":25,"timestamp":1786128540000,"latitude":42.95,"longitude":-93.43}] |
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 in this area?
Calamity.live data shows a weather event with CalamityScore 34/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.