This alert expired on 31 August 2026 at 04:15 UTC. It is kept here as a record.
No stronger detection stands among the 15 recorded within 20 km of this point since 4 April 2026 — 8 others scored the same. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 30 at 11:01PM CDT until August 30 at 11:15PM CDT by NWS Grand Forks ND
Nearby, since 4 April 2026
- August 31, 2026 · score 22 · 0.0 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 22 out of 100, at 66 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 22 / 100 |
| Our confidence | 66% |
| Coordinates | 47.6397, -98.0057 |
| Nearest City | Grand Forks (80 km) |
| Impact Tier | minor |
| Timestamp | 2026-08-31T04:01:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Barnes, ND; Griggs, ND; Grand Forks, ND; Steele, ND; Nelson, ND; Ramsey, ND |
| Headline | Severe Thunderstorm Warning issued August 30 at 11:01PM CDT until August 30 at 11:15PM CDT by NWS Grand Forks ND |
| Expires | 2026-08-30T23:15:00-05:00 |
| SenderName | NWS Grand Forks ND |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.cfda2bc61a550d5c44d782c6350ed40ee718872a.001.1","noaa_urn:oid:2.49.0.1.840.0.fb6da3045fe30d5c28ed088d2275128c40626c9e.001.1","noaa_urn:oid:2.49.0.1.840.0.4ab00acc85219b98a56e18137870857df78e345e.002.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 55 |
| Iem Unit | MPH |
| Iem City | 11 SW Tolna |
| Iem County | Eddy |
| Iem State | ND |
| Iem Wfo | FGF |
| Iem Remark | NDAWN mesonet 10 ft wind. |
| MergedSources | [{"id":"iem_G_47.710_-98.610_1788146580000","source":"iem","severity":"low","severityValue":25,"timestamp":1788146580000,"latitude":47.71,"longitude":-98.61}] |
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 10 February 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.
Calamity.live data shows a weather event with CalamityScore 22/100, near Grand Forks (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.