Right now
The most recent data we hold from NOAA arrived 3 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 29 June 2026 at 03:30 UTC. It is kept here as a record.
It is the 24th strongest of the 63 detections recorded within 20 km of this point since 17 June 2026. 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 June 28 at 9:40PM CDT until June 28 at 10:30PM CDT by NWS Bismarck ND
Urban PEI: 49,450 within a heuristic 50 km radius; not unique people.
Nearby, since 17 June 2026
- June 17, 2026 · score 34 · 18.3 km
- June 30, 2026 · score 40 · 19.6 km
- August 10, 2026 · score 34 · 21.1 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 34 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
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) | 34 / 100 |
| Legacy data-support index | 0.85/1 |
| Coordinates | 47.9929, -101.3483 |
| Nearest City | Minot (27 km) |
| Urban exposure index (PEI) | 49.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-29T02:40:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.78a8e56b9b845789bdaa5cdc0d218827 |
Physical priority index · v1. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-06-29T02:40:00.000Z.
First archived: 2026-06-29T02:42:21.853Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | McLean, ND; Mercer, ND; Renville, ND; Ward, ND |
| Headline | Severe Thunderstorm Warning issued June 28 at 9:40PM CDT until June 28 at 10:30PM CDT by NWS Bismarck ND |
| Expires | 2026-06-28T22:30:00-05:00 |
| SenderName | NWS Bismarck ND |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.78a8e56b9b845789bdaa5cdc0d218827bb9416f4.001.1","noaa_urn:oid:2.49.0.1.840.0.d810d656c9dcbb150a177b6b3bd50273c13eec31.001.1"] |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | Inch |
| Iem City | Riverdale |
| Iem County | McLean |
| Iem State | ND |
| Iem Wfo | BIS |
| Iem Remark | 1 inch (quarter sized) hail reported in Riverdale. |
| MergedSources | [{"id":"iem_H_47.500_-101.370_1782698040000","source":"iem","severity":"low","severityValue":25,"timestamp":1782698040000,"latitude":47.5,"longitude":-101.37}] |
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.
Review the area, threshold and delivery channel in your account.
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