Right now
The most recent data we hold from NOAA arrived 15 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 3 July 2026 at 19:45 UTC. It is kept here as a record.
It is the 28th strongest of the 34 detections recorded within 20 km of this point since 18 May 2026. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued July 3 at 1:29PM CDT until July 3 at 2:45PM CDT by NWS Chicago IL
Nearby, since 18 May 2026
- July 27, 2026 · score 22 · 4.0 km
- August 9, 2026 · score 22 · 6.3 km
- July 27, 2026 · score 43 · 7.2 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 16 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) | 16 / 100 |
| Legacy data-support index | 0.64/1 |
| Coordinates | 42.3724, -87.1845 |
| Nearest City | Zion (54 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-07-03T18:29:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.ae92648b76c81c53d80e8a602d5a3a6f |
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: 2026-07-03T18:29:00.000Z.
First archived: 2026-07-03T18:40:05.000Z. 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 | 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; St Joseph to South Haven MI; South Haven to Holland MI; 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; 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; North Point Light to Wind Point WI; Wind Point WI to Winthrop Harbor IL; Lake Michigan from North Point Light to Wind Point WI 5NM offshore to Mid Lake; Lake Michigan from Wind Point WI to Winthrop Harbor IL 5NM offshore to Mid Lake |
| Headline | Special Marine Warning issued July 3 at 1:29PM CDT until July 3 at 2:45PM CDT by NWS Chicago IL |
| Expires | 2026-07-03T14:45:00-05:00 |
| SenderName | NWS Chicago IL |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.ae92648b76c81c53d80e8a602d5a3a6f5953869d.001.1","noaa_urn:oid:2.49.0.1.840.0.2984edd86b4fe8082316b65d4dd268a7a2787db1.001.1","noaa_urn:oid:2.49.0.1.840.0.06d3566ee35be759a693cb4191331abe4960b4ef.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 58 |
| Iem Unit | MPH |
| Iem City | 3 N Pleasant Prairie |
| Iem County | Kenosha |
| Iem State | WI |
| Iem Wfo | MKX |
| Iem Remark | ASOS measure 50 kts. |
| MergedSources | [{"id":"iem_G_42.590_-87.940_1783101180000","source":"iem","severity":"low","severityValue":25,"timestamp":1783101180000,"latitude":42.59,"longitude":-87.94}] |
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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