Right now
The most recent data we hold from NOAA arrived 2 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 20:30 UTC. It is kept here as a record.
It is the 27th strongest of the 63 detections recorded within 20 km of this point since 18 May 2026. Another comparable one was recorded here earlier the same day. 15 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued July 3 at 4:21PM EDT until July 3 at 4:30PM EDT by NWS Grand Rapids MI
Urban PEI: 296,961 within a heuristic 50 km radius; not unique people.
Nearby, since 18 May 2026
- July 3, 2026 · score 48 · 6.2 km
- May 18, 2026 · score 52 · 8.4 km
- August 11, 2026 · score 52 · 9.2 km
How we know
4 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 43 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) | 43 / 100 |
| Legacy data-support index | 0.88/1 |
| Coordinates | 41.9423, -87.0237 |
| Nearest City | Michigan City (28 km) |
| Urban exposure index (PEI) | 297.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-03T20:21:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.a81165a1f246ff3b131929b9f51304d2 |
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: 2026-07-03T20:21:00.000Z.
First archived: 2026-07-03T20:28:28.843Z. 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 | 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; Calumet Harbor IL to Gary IN; Gary to Burns Harbor IN; Burns Harbor to Michigan City IN; Lake Michigan from Wilmette Harbor to Michigan City in 5NM offshore to Mid Lake |
| Headline | Special Marine Warning issued July 3 at 4:21PM EDT until July 3 at 4:30PM EDT by NWS Grand Rapids MI |
| Expires | 2026-07-03T16:30:00-04:00 |
| SenderName | NWS Grand Rapids MI |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.a81165a1f246ff3b131929b9f51304d29ff01f0e.001.1","noaa_urn:oid:2.49.0.1.840.0.2bfe65510e9cfaeef5046200250f4bc9edd5d7bd.001.1","noaa_urn:oid:2.49.0.1.840.0.d750d459a875541aee4247ad942ca18a6ac9726b.001.1"] |
| Iem TypeSummary | N |
| Iem Magnitude | 55 |
| Iem Unit | MPH |
| Iem City | 1 N Benton Heights |
| Iem County | Berrien |
| Iem State | MI |
| Iem Wfo | IWX |
| Iem Remark | ASOS station KBEH Benton Harbor. |
| MergedSources | [{"id":"iem_M_41.720_-86.940_1783107000000","source":"iem","severity":"low","severityValue":25,"timestamp":1783107000000,"latitude":41.72,"longitude":-86.94},{"id":"iem_G_42.130_-86.420_1783107900000","source":"iem","severity":"low","severityValue":25,"timestamp":1783107900000,"latitude":42.13,"longitude":-86.42},{"id":"iem_N_42.130_-86.420_1783107900000","source":"iem","severity":"low","severityValue":25,"timestamp":1783107900000,"latitude":42.13,"longitude":-86.42}] |
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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