This alert expired on 16 May 2026 at 10:15 UTC. It is kept here as a record.
No stronger detection stands among the 12 recorded within 20 km of this point since 4 April 2026 — one other scored the same. The last comparable one was on 4 April 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 16 at 5:23AM EDT until May 16 at 6:15AM EDT by NWS Grand Rapids MI
An estimated 136,569 people live within 50 km of this point.
Nearby, since 4 April 2026
- June 16, 2026 · score 43 · 10.5 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 43 out of 100, at 81 % 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) | 43 / 100 |
| Our confidence | 81% |
| Coordinates | 43.1160, -84.8300 |
| Nearest City | Waverly (45 km) |
| Population Exposed | 136.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-16T09:23:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.176465ace33f1a2edb930aa41676f9411c57c862.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Clinton, MI; Gratiot, MI; Ionia, MI; Montcalm, MI |
| Headline | Severe Thunderstorm Warning issued May 16 at 5:23AM EDT until May 16 at 6:15AM EDT by NWS Grand Rapids MI |
| Expires | 2026-05-16T06:15:00-04:00 |
| SenderName | NWS Grand Rapids MI |
| HasExactCoords | true |
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.
Want to know when something happens near Waverly?
Calamity.live data shows a weather event with CalamityScore 43/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 187 scientific monitoring sources.