Right now
The most recent data we hold from NOAA arrived 10 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 13 May 2026 at 05:00 UTC. It is kept here as a record.
It is the 3rd strongest of the 36 detections recorded within 20 km of this point since 16 April 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: Special Marine Warning issued May 13 at 12:50AM EDT until May 13 at 1:00AM EDT by NWS Grand Rapids MI
Nearby, since 16 April 2026
- June 11, 2026 · score 16 · 4.2 km
- September 5, 2026 · score 16 · 14.3 km
- July 4, 2026 · score 22 · 15.8 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 22 out of 100, at 60 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
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) | 22 / 100 |
| Our confidence | 60% |
| Coordinates | 42.1714, -86.6014 |
| Nearest City | Michigan City (57 km) |
| Impact Tier | minor |
| Timestamp | 2026-05-13T04:50:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.2f7c0eeff0732d8fd8c7d75fd1579bd66277d307.001.1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | St Joseph to South Haven MI; Lake Michigan from St Joseph to South Haven MI 5NM offshore to Mid Lake |
| Headline | Special Marine Warning issued May 13 at 12:50AM EDT until May 13 at 1:00AM EDT by NWS Grand Rapids MI |
| Expires | 2026-05-13T01:00:00-04:00 |
| 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 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.
Want to know when something happens in this area?
Calamity.live data shows a weather event with CalamityScore 22/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.