This alert expired on 1 July 2026 at 16:30 UTC. It is kept here as a record.
No stronger detection stands among the 19 recorded within 20 km of this point since 15 March 2026 — 2 others scored the same. 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: Special Marine Warning issued July 1 at 11:34AM EDT until July 1 at 12:30PM EDT by NWS Grand Rapids MI
Nearby, since 15 March 2026
- June 10, 2026 · score 16 · 18.0 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 22 out of 100, at 66 % 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 | 66% |
| Coordinates | 44.0336, -86.5382 |
| Nearest City | Manitowoc (90 km) |
| Impact Tier | minor |
| Timestamp | 2026-07-01T15:34:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.ffb8eb7be186cf7a0dd2be8a06a2e368d4e5ffcc.001.1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Pentwater to Manistee MI; Lake Michigan from Pentwater to Manistee MI 5NM offshore to Mid Lake |
| Headline | Special Marine Warning issued July 1 at 11:34AM EDT until July 1 at 12:30PM EDT by NWS Grand Rapids MI |
| Expires | 2026-07-01T12:30:00-04:00 |
| SenderName | NWS Grand Rapids MI |
| HasExactCoords | true |
| Iem TypeSummary | R |
| Iem Magnitude | 1.2 |
| Iem Unit | Inch |
| Iem City | 2 SE Scottville |
| Iem County | Mason |
| Iem State | MI |
| Iem Wfo | GRR |
| Iem Remark | 12 hour rain total. CO-OP Observer station SCOM4 Scottville 2 SE. |
| MergedSources | [{"id":"iem_R_43.930_-86.250_1782903600000","source":"iem","severity":"low","severityValue":25,"timestamp":1782903600000,"latitude":43.93,"longitude":-86.25}] |
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.