Right now
The most recent data we hold from NOAA arrived 8 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 17:00 UTC. It is kept here as a record.
It is the 129th strongest of the 191 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Watch issued June 29 at 6:02AM CDT until June 29 at 12:00PM CDT by NWS Grand Forks ND
Urban PEI: 16,788 within a heuristic 50 km radius; not unique people.
Nearby, since 15 March 2026
- September 11, 2026 · score 28 · 0.0 km
- September 4, 2026 · score 28 · 0.0 km
- September 3, 2026 · score 28 · 0.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 28 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) | 28 / 100 |
| Legacy data-support index | 0.80/1 |
| Coordinates | 46.0000, -94.3000 |
| Nearest City | Sartell (43 km) |
| Urban exposure index (PEI) | 16.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-29T11:02:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Watch_noaa_urn:oid:2.49.0.1.840.0.5ed5107b3dc30ae0aa9373acd8d5f180 |
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: 2026-06-29T11:02:00.000Z.
First archived: 2026-06-29T12:12:25.812Z. 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 Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | Becker, MN; Clay, MN; Grant, MN; Mahnomen, MN; Norman, MN; Otter Tail, MN; Wilkin, MN; Cass, ND; Ransom, ND; Richland, ND; Sargent, ND; Big Stone, MN; Traverse, MN; Brown, SD; Buffalo, SD; Clark, SD; Codington, SD; Day, SD; Edmunds, SD; Faulk, SD; Grant, SD; Hand, SD; Hughes, SD; Hyde, SD; Lyman, SD; McPherson, SD; Marshall, SD; Potter, SD; Roberts, SD; Spink, SD; Stanley, SD; Sully, SD |
| Headline | Severe Thunderstorm Watch issued June 29 at 6:02AM CDT until June 29 at 12:00PM CDT by NWS Grand Forks ND |
| Expires | 2026-06-29T12:00:00-05:00 |
| SenderName | NWS Grand Forks ND |
| HasExactCoords | false |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.5ed5107b3dc30ae0aa9373acd8d5f180083d9cab.001.1","noaa_urn:oid:2.49.0.1.840.0.8121526adeccd62d803fc2901a8c5b595254b573.001.1"] |
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.
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