Right now
The most recent data we hold from NOAA arrived 2 minutes ago, and this point is in it.
3 other detections within 20 km in the last 24 hours, the nearest 17 km from here.
This alert is in force until 12 September 2026, 01:00 UTC.
No stronger detection stands among the 20 recorded within 20 km of this point since 15 March 2026 — 2 others scored the same. The last comparable one was on 11 September 2026. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 11 at 7:05PM CDT until September 11 at 8:00PM CDT by NWS Grand Forks ND
Nearby, since 15 March 2026
- June 10, 2026 · score 22 · 2.1 km
- September 11, 2026 · score 28 · 17.5 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 28 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 | High |
| Calamity Score (ours) | 28 / 100 |
| Our confidence | 71% |
| Coordinates | 45.7200, -95.9167 |
| Nearest City | Willmar (96 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-12T00:05:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.031727b9145bbe986e11d3f640e2597e46ef919a.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Otter Tail, MN; Big Stone, MN; Traverse, MN; Otter Tail, MN; Wadena, MN and 3 more areas |
| Headline | Severe Thunderstorm Warning issued September 11 at 7:05PM CDT until September 11 at 8:00PM CDT by NWS Grand Forks ND |
| Expires | 2026-09-11T20:00:00-05:00 |
| SenderName | NWS Grand Forks ND |
| HasExactCoords | true |
| MergedCount | 6 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.031727b9145bbe986e11d3f640e2597e46ef919a.001.1","noaa_urn:oid:2.49.0.1.840.0.e31c497f3c1e9ef4474ce249cc3905660cd7f20d.001.1","noaa_urn:oid:2.49.0.1.840.0.19249d5a2cce8dab1ae0d83383664cb3f385119d.001.1","noaa_urn:oid:2.49.0.1.840.0.61292845487a3ba1102d7c9d67f59445500bfbd3.001.1","noaa_urn:oid:2.49.0.1.840.0.ead2b542698e6fb7ff7b24bd30f429e23c098f17.001.1","noaa_urn:oid:2.49.0.1.840.0.de33b8d18d3f0ad49ecc9b67ea614400de437e70.001.1"] |
| Spc ReportType | hail |
| Spc Speed | 125 |
| Spc Location | 2 SSE Norcross |
| Spc County | Grant |
| Spc State | MN |
| Spc Comments | (FGF) |
| Iem TypeSummary | H |
| Iem Magnitude | 1.25 |
| Iem Unit | Inch |
| Iem City | 4.8 SW Herman |
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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