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 18:15 UTC. It is kept here as a record.
No stronger detection stands among the 37 recorded within 20 km of this point since 10 March 2026 — 26 others scored the same. 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 12:14PM CDT until May 18 at 1:15PM CDT by NWS Milwaukee/Sullivan WI
Nearby, since 10 March 2026
- March 10, 2026 · score 22 · 3.3 km
- July 3, 2026 · score 22 · 9.1 km
- September 5, 2026 · score 16 · 9.4 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 22 out of 100, at 65 % 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 | 65% |
| Coordinates | 42.3465, -86.9131 |
| Nearest City | Michigan City (71 km) |
| Impact Tier | minor |
| Timestamp | 2026-05-18T17:14:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.3d6a657b622d0c9b9809850089b6bec5 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Lake Michigan from Wind Point WI to Winthrop Harbor IL 5NM offshore to Mid Lake; 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; New Buffalo MI to St Joseph MI; Michigan City IN to New Buffalo MI; Lake Michigan Michigan City IN to St. Joseph MI 5 NM offshore to mid-line of lake. |
| Headline | Special Marine Warning issued May 18 at 12:14PM CDT until May 18 at 1:15PM CDT by NWS Milwaukee/Sullivan WI |
| Expires | 2026-05-18T13:15:00-05:00 |
| SenderName | NWS Milwaukee/Sullivan WI |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.3d6a657b622d0c9b9809850089b6bec58bda40c2.002.1","noaa_urn:oid:2.49.0.1.840.0.258f049f224d4349caff0c84ae331bfafe6861bb.001.1","noaa_urn:oid:2.49.0.1.840.0.9c09acd13247425de3828f508e397963a6266548.001.1"] |
| Iem TypeSummary | M |
| Iem Magnitude | 58 |
| Iem Unit | MPH |
| Iem City | 3 NE Navy Pier |
| Iem County | LMZ741 |
| Iem State | IL |
| Iem Wfo | LOT |
| Iem Remark | Harrison-Dever Crib recorded 50 knot wind gust. |
| MergedSources | [{"id":"iem_M_41.920_-87.570_1779120840000","source":"iem","severity":"low","severityValue":25,"timestamp":1779120840000,"latitude":41.92,"longitude":-87.57}] |
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.