This alert expired on 2 July 2026 at 16:51 UTC. It is kept here as a record.
It is the strongest of the 34 detections recorded within 20 km of this point since 15 March 2026. The last comparable one was on 30 June 2026. 18 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 2 at 11:44AM CDT until July 2 at 11:45AM CDT by NWS Sioux Falls SD
An estimated 41,044 people live within 50 km of this point.
Nearby, since 15 March 2026
- September 2, 2026 · score 16 · 15.2 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 34 out of 100, at 81 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 34 / 100 |
| Our confidence | 81% |
| Coordinates | 43.8337, -94.4086 |
| Nearest City | Mankato (48 km) |
| Population Exposed | 41.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-02T16:44:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.62610c1765d3fbf5b5ee623632983e31 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Cottonwood, MN; Cerro Gordo, IA; Hancock, IA; Worth, IA; Blue Earth, MN; Brown, MN; Nicollet, MN; Watonwan, MN |
| Headline | Severe Thunderstorm Warning issued July 2 at 11:44AM CDT until July 2 at 11:45AM CDT by NWS Sioux Falls SD |
| Expires | 2026-07-02T11:51:00-05:00 |
| SenderName | NWS Sioux Falls SD |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.62610c1765d3fbf5b5ee623632983e313269afeb.001.1","noaa_urn:oid:2.49.0.1.840.0.9624e205a6782e6175e15f69667d0191a285e031.001.1","noaa_urn:oid:2.49.0.1.840.0.1e09a404a30336622333d7bc338385bcfe984317.001.1"] |
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 10 February 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.