Right now
The most recent data we hold from NOAA arrived 5 minutes ago, and this point is in it.
3 other detections within 20 km in the last 24 hours, the nearest 10 km from here.
This alert expired on 12 September 2026 at 01:45 UTC. It is kept here as a record.
No stronger detection stands among the 8 recorded within 20 km of this point since 15 March 2026 — 2 others scored the same. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Tornado Warning issued September 11 at 8:04PM CDT until September 11 at 8:45PM CDT by NWS Twin Cities/Chanhassen MN
Nearby, since 15 March 2026
- September 11, 2026 · score 16 · 26.3 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 46 out of 100, at 71 % 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 | Critical |
| Calamity Score (ours) | 46 / 100 |
| Our confidence | 71% |
| Coordinates | 45.4660, -96.0060 |
| Nearest City | Willmar (85 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-12T01:04:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.1dff079b59a9bcb52c0650ac1369e46daeb068c3.001.1 |
Score Breakdown
Technical Details
| Event | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Stevens, MN |
| Headline | Tornado Warning issued September 11 at 8:04PM CDT until September 11 at 8:45PM CDT by NWS Twin Cities/Chanhassen MN |
| Expires | 2026-09-11T20:45:00-05:00 |
| SenderName | NWS Twin Cities/Chanhassen MN |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.1dff079b59a9bcb52c0650ac1369e46daeb068c3.001.1","noaa_urn:oid:2.49.0.1.840.0.fae5c51d782f8f771530c59d8949d9e98e533a65.001.1"] |
| Spc ReportType | hail |
| Spc Speed | 100 |
| Spc Location | Chokio |
| Spc County | Stevens |
| Spc State | MN |
| Spc Comments | (MPX) |
| Iem TypeSummary | H |
| Iem Magnitude | 1.25 |
| Iem Unit | Inch |
| Iem City | 2 SSE Norcross |
Safety Information
If a tornado warning is issued: go to a basement or an interior room on the lowest floor, away from windows. A vehicle and a mobile home are not shelter. Cover your head and neck. Wait for the official all-clear before going outside, and watch for downed power lines and gas leaks afterwards.
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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