Right now
The most recent data we hold from NOAA arrived 7 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 17:30 UTC. It is kept here as a record.
It is the 2nd strongest of the 85 detections recorded within 20 km of this point since 3 April 2026. Another comparable one was recorded here earlier the same day. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued May 18 at 12:27PM EDT until May 18 at 1:30PM EDT by NWS Northern Indiana
Urban PEI: 3,921,227 within a heuristic 50 km radius; not unique people.
Nearby, since 3 April 2026
- August 11, 2026 · score 52 · 1.0 km
- July 3, 2026 · score 48 · 3.0 km
- July 4, 2026 · score 52 · 4.1 km
How we know
3 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 52 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
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) | 52 / 100 |
| Legacy data-support index | 0.90/1 |
| Coordinates | 41.8772, -87.0749 |
| Nearest City | Michigan City (24 km) |
| Urban exposure index (PEI) | 3.9M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-18T16:27:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.9c09acd13247425de3828f508e397963 |
Physical priority index · v1. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-05-18T16:27:00.000Z.
First archived: 2026-05-18T16:30:32.664Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | 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.; Winthrop Harbor to Wilmette Harbor IL; 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 May 18 at 12:27PM EDT until May 18 at 1:30PM EDT by NWS Northern Indiana |
| Expires | 2026-05-18T13:30:00-04:00 |
| SenderName | NWS Northern Indiana |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.9c09acd13247425de3828f508e397963a6266548.001.1","noaa_urn:oid:2.49.0.1.840.0.03e506535187c138bb6e2a5b32fa511270ea1536.001.1"] |
| Google News RssFeed | weather |
| Google News SourceName | NBC 5 Chicago |
| MergedSources | [{"id":"gnews_weather_494197_150","source":"google_news","severity":"medium","severityValue":40,"timestamp":1779110226000,"latitude":41.85,"longitude":-87.65},{"id":"gnews_weather_494197_169","source":"google_news","severity":"medium","severityValue":40,"timestamp":1779110709000,"latitude":41.85,"longitude":-87.65}] |
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.
Review the area, threshold and delivery channel in your account.
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