Right now
The most recent data we hold from NOAA arrived 9 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 16 June 2026 at 21:00 UTC. It is kept here as a record.
It is the 2nd strongest of the 11 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 16 at 4:37PM EDT until June 16 at 5:00PM EDT by NWS Grand Rapids MI
Urban PEI: 26,060 within a heuristic 50 km radius; not unique people.
Nearby, since 16 March 2026
- May 16, 2026 · score 43 · 13.2 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
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 | 0.80/1 |
| Coordinates | 43.2289, -84.7796 |
| Nearest City | Mount Pleasant (41 km) |
| Urban exposure index (PEI) | 26.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-16T20:37:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.44fcaa08bbd4526f09b318d18240d06e |
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: 2026-06-16T20:37:00.000Z.
First archived: 2026-06-16T20:41:24.859Z. 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 | Barry, MI; Eaton, MI; Kent, MI; Mecosta, MI; Montcalm, MI; Kent, MI; Montcalm, MI and 2 more areas |
| Headline | Severe Thunderstorm Warning issued June 16 at 4:37PM EDT until June 16 at 5:00PM EDT by NWS Grand Rapids MI |
| Expires | 2026-06-16T17:00:00-04:00 |
| SenderName | NWS Grand Rapids MI |
| HasExactCoords | true |
| MergedCount | 5 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.44fcaa08bbd4526f09b318d18240d06e51913f4f.001.1","noaa_urn:oid:2.49.0.1.840.0.115f8b6aab6c763adc889cbbf0240ec6dfb44f5f.001.1","noaa_urn:oid:2.49.0.1.840.0.48ac0ed4015ec98192bd888eef088e5f4ea49b9a.001.1","noaa_urn:oid:2.49.0.1.840.0.ff38e78f899950edcd31b3924da72f20df5adfce.001.1","noaa_urn:oid:2.49.0.1.840.0.a5b1a9296c9c608c0d1b19bc7ea1daf77e51bab6.001.1"] |
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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