This alert expired on 3 September 2026 at 20:45 UTC. It is kept here as a record.
It is the 10th strongest of the 63 detections recorded within 20 km of this point since 3 April 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 3 at 3:01PM CDT until September 3 at 3:45PM CDT by NWS Grand Forks ND
Nearby, since 3 April 2026
- June 10, 2026 · score 46 · 18.8 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 16 out of 100, at 66 % 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 | Medium |
| Calamity Score (ours) | 16 / 100 |
| Our confidence | 66% |
| Coordinates | 47.5359, -96.3492 |
| Nearest City | Grand Forks (67 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-03T20:01:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.d68f9840b71854710a6f02b0ad372d1981faa5b0.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Clay, MN; Norman, MN; Mahnomen, MN; Marshall, MN; Norman, MN; Pennington, MN; Polk, MN; Red Lake, MN; Traill, ND |
| Headline | Severe Thunderstorm Warning issued September 3 at 3:01PM CDT until September 3 at 3:45PM CDT by NWS Grand Forks ND |
| Expires | 2026-09-03T15:45:00-05:00 |
| SenderName | NWS Grand Forks ND |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.d68f9840b71854710a6f02b0ad372d1981faa5b0.001.1","noaa_urn:oid:2.49.0.1.840.0.9f03c49bddd597eab0e0e70aea65c32edfb7f1b3.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 59 |
| Iem Unit | MPH |
| Iem City | 4 NNW Fertile |
| Iem County | Polk |
| Iem State | MN |
| Iem Wfo | FGF |
| Iem Remark | 10 meter wind measured at the Fertile MAWN. |
| MergedSources | [{"id":"iem_G_47.570_-96.220_1788465300000","source":"iem","severity":"low","severityValue":25,"timestamp":1788465300000,"latitude":47.57,"longitude":-96.22},{"id":"iem_G_47.590_-96.310_1788464460000","source":"iem","severity":"low","severityValue":25,"timestamp":1788464460000,"latitude":47.59,"longitude":-96.31}] |
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 16/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.