Right now
The most recent data we hold from NOAA arrived 6 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 11 March 2026 at 00:00 UTC. It is kept here as a record.
No stronger detection stands among the 30 recorded within 20 km of this point since 10 March 2026 — 24 others scored the same.
What the source measured
NOAA reported: Special Marine Warning issued March 10 at 7:26PM EDT until March 10 at 8:00PM EDT by NWS Grand Rapids MI
Nearby, since 10 March 2026
- July 3, 2026 · score 22 · 9.7 km
- September 5, 2026 · score 16 · 11.4 km
- June 8, 2026 · score 22 · 13.0 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 57 % 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 | 57% |
| Coordinates | 42.3598, -86.8773 |
| Nearest City | Michigan City (72 km) |
| Impact Tier | minor |
| Timestamp | 2026-03-10T23:26:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special-Marine-Warning_noaa_urn-oid-2_49_0_1_840_0_69ab059f9b90886566ce11bd0b947085 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Holland to Grand Haven MI; Grand Haven to Whitehall MI; Lake Michigan from Grand Haven to Whitehall MI 5NM offshore to Mid Lake; Lake Michigan from Holland to Grand Haven MI 5NM offshore to Mid Lake; Wilmette Harbor to Northerly Island IL; Northerly Island to Calumet Harbor IL; Calumet Harbor IL to Gary IN; Gary to Burns Harbor IN; Burns Harbor to Michigan City IN; Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5NM offshore to Mid Lake; Lake Michigan from Wilmette Harbor to Michigan City in 5NM offshore to Mid Lake |
| Headline | Special Marine Warning issued March 10 at 7:26PM EDT until March 10 at 8:00PM EDT by NWS Grand Rapids MI |
| Expires | 2026-03-10T20:00:00-04:00 |
| SenderName | NWS Grand Rapids MI |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.69ab059f9b90886566ce11bd0b94708591e51665.001.1","noaa_urn:oid:2.49.0.1.840.0.162fc8e2db8cde923164834d7480fb5d8559350b.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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