This alert expired on 3 August 2026 at 12:15 UTC. It is kept here as a record.
No stronger detection stands among the 35 recorded within 20 km of this point since 31 March 2026 — one other scored the same. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 3 at 7:06AM CDT until August 3 at 7:15AM CDT by NWS Grand Forks ND
An estimated 57,011 people live within 50 km of this point.
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 39 out of 100, at 92 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 39 / 100 |
| Our confidence | 92% |
| Coordinates | 47.9420, -97.4000 |
| Nearest City | Grand Forks (28 km) |
| Population Exposed | 57.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-03T12:06:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.26d2c0bbf8c14bf5dbddf87a3aca57c4a512c279.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Grand Forks, ND |
| Headline | Severe Thunderstorm Warning issued August 3 at 7:06AM CDT until August 3 at 7:15AM CDT by NWS Grand Forks ND |
| Expires | 2026-08-03T07:15:00-05:00 |
| SenderName | NWS Grand Forks ND |
| HasExactCoords | true |
| Iem TypeSummary | H |
| Iem Magnitude | 0.5 |
| Iem Unit | Inch |
| Iem City | 1 WNW Grand Forks |
| Iem County | Grand Forks |
| Iem State | ND |
| Iem Wfo | FGF |
| Iem Remark | Pea size to 1/2 inch diameter hail fell for about 5 minutes at NWS Grand Forks. |
| MergedSources | [{"id":"iem_H_48.290_-96.740_1785751200000","source":"iem","severity":"low","severityValue":25,"timestamp":1785751200000,"latitude":48.29,"longitude":-96.74},{"id":"iem_H_47.920_-97.100_1785743460000","source":"iem","severity":"low","severityValue":25,"timestamp":1785743460000,"latitude":47.92,"longitude":-97.1}] |
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 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 near Grand Forks?
Calamity.live data shows a weather event with CalamityScore 39/100, near Grand Forks (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.