Right now
The most recent data we hold from NOAA arrived 5 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 02:30 UTC. It is kept here as a record.
It is the 4th strongest of the 20 detections recorded within 20 km of this point since 27 April 2026. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued July 2 at 8:57PM EDT until July 2 at 10:30PM EDT by NWS Grand Rapids MI
Urban PEI: 638,360 within a heuristic 50 km radius; not unique people.
Nearby, since 27 April 2026
- June 11, 2026 · score 41 · 9.2 km
- June 16, 2026 · score 52 · 13.6 km
- June 16, 2026 · score 48 · 14.1 km
How we know
5 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 48 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) | 48 / 100 |
| Legacy data-support index | 0.89/1 |
| Coordinates | 43.1882, -87.4070 |
| Nearest City | Milwaukee (44 km) |
| Urban exposure index (PEI) | 638.4K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-03T00:57:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.6655454de7185fa40c66fa75e46e6803 |
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: 2026-07-03T00:57:00.000Z.
First archived: 2026-07-03T01:12:02.086Z. 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 | Grand Haven to Whitehall MI; Whitehall to Pentwater MI; Pentwater to Manistee MI; Lake Michigan from Pentwater to Manistee MI 5NM offshore to Mid Lake; Lake Michigan from Whitehall to Pentwater MI 5NM offshore to Mid Lake; Lake Michigan from Grand Haven to Whitehall MI 5NM offshore to Mid Lake; Sheboygan to Port Washington WI; Port Washington to North Point Light WI; Lake Michigan from Sheboygan to Port Washington WI 5NM offshore to Mid Lake; Lake Michigan from Port Washington to North Point Light WI 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 July 2 at 8:57PM EDT until July 2 at 10:30PM EDT by NWS Grand Rapids MI |
| Expires | 2026-07-02T22:30:00-04:00 |
| SenderName | NWS Grand Rapids MI |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.6655454de7185fa40c66fa75e46e6803032f649d.001.1","noaa_urn:oid:2.49.0.1.840.0.aa63eeb3698265703956903510f1210b8bb00cd6.001.1","noaa_urn:oid:2.49.0.1.840.0.f6a48184773e5085aea5b0db21dbb4a74bd4913b.001.1","noaa_urn:oid:2.49.0.1.840.0.19f845e4da7a5edade07935edc47e5f3347ca633.001.1"] |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | Inch |
| Iem City | 3 ESE Jackson |
| Iem County | Washington |
| Iem State | WI |
| Iem Wfo | MKX |
| Iem Remark | Trained spotter reports 1 inch diameter hail in Jackson. |
| Google News RssFeed | weather |
| Google News SourceName | WTMJ |
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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