Right now
The most recent data we hold from NOAA arrived 16 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
7 other detections within 20 km in the last 24 hours, the nearest <1 km from here.
This alert expired on 12 September 2026 at 01:00 UTC. It is kept here as a record.
It is the 6th strongest of the 36 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 11 at 7:23PM CDT until September 11 at 8:00PM CDT by NWS Grand Forks ND
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 | 45.9692, -95.6255 |
| Nearest City | Willmar (105 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-12T00:23:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.609284745c7b4fdc44dd552fbf407fafecb4953f.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Otter Tail, MN; Grant, MN; Cass, MN and 5 more areas |
| Headline | Severe Thunderstorm Warning issued September 11 at 7:23PM 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 | 9 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.609284745c7b4fdc44dd552fbf407fafecb4953f.001.1","noaa_urn:oid:2.49.0.1.840.0.d05a65cb45beb9dfbd347ad124953af8b6489e86.001.1","noaa_urn:oid:2.49.0.1.840.0.454bb5611f710f1abc964a38a3a6d51b5791fb82.001.1","noaa_urn:oid:2.49.0.1.840.0.eae3e1b187c92358e7b0ab2579ca5b4460690ad2.001.1","noaa_urn:oid:2.49.0.1.840.0.03e3c4ad0b54bc9e2c3d1ec31aeb3f54aa48e9aa.001.1","noaa_urn:oid:2.49.0.1.840.0.f5e8dae764f744a5358e49c48d61c181c1d1d322.001.1","noaa_urn:oid:2.49.0.1.840.0.aaf7884605350d593aaad80f8c6317a9a38486d1.002.1","noaa_urn:oid:2.49.0.1.840.0.e31c497f3c1e9ef4474ce249cc3905660cd7f20d.001.1","noaa_urn:oid:2.49.0.1.840.0.19249d5a2cce8dab1ae0d83383664cb3f385119d.001.1"] |
| 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 | 2 SSE Norcross |
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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