Right now
The most recent data we hold from NOAA arrived 4 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 18 May 2026 at 18:30 UTC. It is kept here as a record.
It is the 13th strongest of the 44 detections recorded within 20 km of this point since 10 March 2026. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued May 18 at 1:00PM EDT until May 18 at 2:30PM EDT by NWS Grand Rapids MI
Nearby, since 10 March 2026
- September 5, 2026 · score 16 · 5.2 km
- September 5, 2026 · score 16 · 5.7 km
- May 18, 2026 · score 22 · 6.2 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 22 out of 100, at 70 % 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 | 70% |
| Coordinates | 42.2588, -86.9870 |
| Nearest City | Michigan City (61 km) |
| Impact Tier | minor |
| Timestamp | 2026-05-18T17:00:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.258f049f224d4349caff0c84ae331bfa |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | St Joseph to South Haven MI; South Haven to Holland MI; Holland to Grand Haven MI; Lake Michigan from Holland to Grand Haven MI 5NM offshore to Mid Lake; Lake Michigan from South Haven to Holland MI 5NM offshore to Mid lake; Lake Michigan from St Joseph to South Haven MI 5NM offshore to Mid Lake; 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; Wind Point WI to Winthrop Harbor IL; Lake Michigan from Wind Point WI to Winthrop Harbor IL 5NM offshore to Mid Lake and 1 more areas |
| Headline | Special Marine Warning issued May 18 at 1:00PM EDT until May 18 at 2:30PM EDT by NWS Grand Rapids MI |
| Expires | 2026-05-18T14:30:00-04:00 |
| SenderName | NWS Grand Rapids MI |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.258f049f224d4349caff0c84ae331bfafe6861bb.001.1","noaa_urn:oid:2.49.0.1.840.0.55fd81c04a4857194015fc3a23760da71ce84a4b.002.1","noaa_urn:oid:2.49.0.1.840.0.d49371dcb7ba0a7d32071f6fb9f2c21b582a1d48.001.1","noaa_urn:oid:2.49.0.1.840.0.9c09acd13247425de3828f508e397963a6266548.001.1"] |
| Iem TypeSummary | M |
| Iem Magnitude | 62 |
| Iem Unit | MPH |
| Iem City | 4 NE Beverly Shores |
| Iem County | LMZ745 |
| Iem State | IN |
| Iem Wfo | LOT |
| Iem Remark | Michigan City CMAN station reported 54 kt gust. |
| MergedSources | [{"id":"iem_M_41.920_-87.570_1779120840000","source":"iem","severity":"low","severityValue":25,"timestamp":1779120840000,"latitude":41.92,"longitude":-87.57},{"id":"iem_M_41.730_-86.930_1779122640000","source":"iem","severity":"low","severityValue":25,"timestamp":1779122640000,"latitude":41.73,"longitude":-86.93}] |
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.